Indonesia Conference Directory

Corresponding Author
Nadiya Miftachul Chusna

Institutions
Sunaryono(a,b)*, Nadiya Miftachul Chusna(a), Nandang Mufti(a,b), and Ahmad Taufiq(a,b)
(a)Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia
(b)Research Center of Minerals and Advanced Materials, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5 Malang 65145, Indonesia
*corresponding author: sunaryono.fmipa[at]um.ac.id

Abstract
Silver material has been successfully synthesized using the chemical reduction method, while Mn0.25Fe2.75O4/silver material has been successfully fabricated using the coprecipitation method. The characterization of the crystal nanostructure of the material was carried out using an XRD instrument whose results showed the appearance of diffraction peaks corresponding to the magnetite and silver phases. The characterization of functional groups from the sample was carried out using FTIR instruments whose results showed that the functional group bonds produced corresponded to the wavelength range of the material constituents of Mn0.25Fe2.75O4/silver. The magnetic properties of Mn0.25Fe2.75O4/silver material were successfully characterized using VSM instruments. The results obtained are in the form of a hysteresis curve which shows that the sample Mn0.25Fe2.75O4/silver has superparamagnetic properties which are indicated by a coercive field value that is close to zero. While the antimicrobial activity was characterized by using the diffusion method and the results showed that the anti-microbial activity of the sample /silver worked very well. This result is characterized by the emergence of microbial free zones around the sample Mn0.25Fe2.75O4/silver with a significant radius.

Keywords
Mn0.25Fe2.75O4/silver, Magnetic Properties, Anti-Microbial Activity

Topic
Magnetic Methods

Link: https://ifory.id/abstract/u6C4DYZAxyvV

Corresponding Author
Wahyu Hidayat

Institutions
1). Ph.D Student of Geological Engineering UPN “Veteran” Yogyakarta
2). Geological Engineering Department UPN “Veteran” Yogyakarta
3). Geophysical Engineering Department UPN “Veteran” Yogyakarta
*Correspondence :ardian.novianto[at]upnyk.ac.id, 08156895363

Abstract
There has not been any certain recognition for the configuration of Kendeng Basin up to recent times. The thick quartered volcanic deposits at the top layer were one of the problems in imaging the configuration of this basin. Geological data interpret that the basement of Kendeng Basin has transitional properties between accretion and continental types. The pattern of a structure due to the collision between microcontinent Australia and Sundaland in this Basin are still questionable. The understanding of the structure pattern is essential due to it will control the formation of the Kendeng Basin. To adds the difficulty, the basement in this basin was not exposed to the surface. Geomagnetic methods were applied to analyze the configuration of the Kendeng Basin. The measurement of Geomagnetic has carried out in the Kendeng Basin in the West and Central Kendeng with the north-south relative line. The distance between measurement points is approximately 5 Km. The pattern of Kendeng Basin can be interpreted with data processing by apply regional-residual magnetic anomalies to obtain deeper anomalies. The structural analysis was carried out on regional Anomaly data by applying several derivative formulas to produce a pattern map of the Kendeng Basin. The results of this study indicate that the basement of the Kendeng basin is a block-faulting with the East-West relative direction. West-East trending structure is the main structure. We interpret the structure to have NE-SW oriented Meratus pattern which formed due to early-Eocene Collision.

Keywords
Kendeng Basin, Structure, Basement, Geomagnetic

Topic
Magnetic Methods

Link: https://ifory.id/abstract/tjZu8w6xBPqD

Corresponding Author
Suryawan Asfar

Institutions
a) Geophysics Department Halu Oleo University, Campus Bumi Thridharma, Anduonohu, Kendari City, Sulawesi Tenggara Province, Phone (0401)3191929, Fax (0401) 3190496
b) Geologi Department Halu Oleo University, Campus Bumi Thridharma, Anduonohu, Kendari City, Sulawesi Tenggara Province, Phone (0401)3191929, Fax (0401) 3190496

Abstract
Abstract: Research has been carried out on the profiles of laterite soils at the PT Macika Mada Madana Site Palangga South Konawe District. The purpose of this study was to determine the profile of laterite soils based on magnetic susceptibility values and metal elements. A total of 180 laterite soil samples were taken from two trajectories measured by magnetic susceptibility values (χLF, χHF, χFD (%)) and the metal mineral content (Fe, Al, Ni, Si, Mg, Cr, Mn). The results of this study indicate that there are three layers in the laterite soil profile: The average value of χFD (%)> 2% is followed by increasing elements of Fe, Al, Mn, Cr, and Zn indicated as limonite layers, while for the value of (χFD (%) <2% is followed by an increase in the elements of Ni, Si, and SiO2 indicated as saprolite layers. The FD magnetic susbility value (%) which is close to zero and low Fe, Al, Cr, and Ni elements is followed by an increase in the content of Mg and Si elements at the bottom of the profile occurring in the transition zone or bed rock zone.

Keywords
Soil Laterite, Magnetic Susceptibility, Site Palangga

Topic
Magnetic Methods

Link: https://ifory.id/abstract/MG4t3Cgubv8K

Corresponding Author
Aris Doyan

Institutions
Mataram University

Abstract
M-type barium hexaferrites synthesis with Zn-Mn doping ion (BaFe) to be applied as a microwave absorbent material using co-precipitation method. The materials used in the synthesis process are FeCl3, 12M HCl, NH4OH 37%, CoCl2.6H212-2x CoO and NiClO. This research to investigate the effect of doping ion concentration variation (x = 0.0, 0.6 and 1.0) and calcination temperature (T = 80, 600, and 800oC) on electrical properties. The samples were characterized using Network Vector Analyzer (VNA). The result from VNA showed that the electrical conductivity values measured in the range 8.0-15.0 GHz indicate that the sample is a semiconductor (5.8 x 10-4 - 1.27 x 10-1 S/cm). The value of permittivity real and imaginary showed that increased with increasing of concentration doping and frequency.

Keywords
Electrical Properties, M-Type Barium Hexaferrites (BaFe12-2x Znx MnxO19)

Topic
Magnetic Methods

Link: https://ifory.id/abstract/WAmwY29rJnVp

Corresponding Author
M Tommy Hasan Abadi

Institutions
(1) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang Jl. Semarang 5, Malang 65145, Indonesia
(2) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang Jl. Semarang 5, Malang 65145, Indonesia
*corresponding author: nandang.mufti.fmipa[at]um.ac.id

Abstract
Hematite (Fe2O3) is one of the magnetic materials which abundant in nature. Ability absorb in region visible light and electrochemical stability makes this material potential using photoanode for PEC cells. however, the disadvantages is short hole diffusion length (<5 nm) and low hole mobility is necessary combined with other materials to improve photolectrochemicals performances. Among of the way to improve performance of photoelectrochemical cell is to make a bilayer structure of hematite material with Zinc Oxide (ZnO) material. ZnO materials are choosen because of their superiority in electron mobility, band gaps wider than Fe2O3, able to capture light in the UV spectrum, and are easily fabricated. In this study we reported the manufacture of Fe2O3 / ZnO photoanodes on ITO substrates using spin coating techniques and doctor blade methods. XRD characterization was used to determine the crystal structure of Fe2O3 / ZnO. The bilayer arrangement and morphology of Fe2O3 / ZnO as a photoanode are confirmed by the results of cross section and electron microscope. While photoelectrochemical ability is shown by the efficiency value of the results of testing Cyclic Voltammetry.

Keywords
Fe2O3/ZnO, photoanode, Photoelectrochemical Performance, spin coating

Topic
Magnetic Methods

Link: https://ifory.id/abstract/xqbdwnCPRteY

Corresponding Author
Nono Agus Santoso

Institutions
Institut Teknologi Sumatera

Abstract
Natar hot spring is one of the unique hot springs in Lampung. These springs are far from volcanoes but have geothermal manifestations so researchers wonder what geothermal systems are from these springs? Before discussing the geothermal system in Natar, the researcher wanted to know the distribution of hot water under the surface of the Natar hot springs. The method used to determine the distribution of hot water is the magnetic method using a gradiometer tool. This research is still ongoing so the results cannot be concluded.

Keywords
geothermal, gradiometer, Natar

Topic
Magnetic Methods

Link: https://ifory.id/abstract/kjqEVF9LD83g

Corresponding Author
Ishmah Luthfiyah

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia
c) Department of Physics, Universitas Negeri Surabaya, 60254 Surabaya, Indonesia

*markus.diantoro.fmipa[at]um.ac.id

Abstract
SrTiO3 perovskite possesses high dielectric properties and potentially applied as a high-temperature thermoelectric material. Theoretically, physical properties of SrTiO3 can be improved by doping process. Modification of local structure will influence its electrical conductivity, thus a crystal field changes or geometric distortion occurs. Currently, SrTiO3 has been widely studied with various dopants. However, so far there is no comprehensive study about structural modification using multivalent magnetic ion of Chromium (Cr) and external magnetic fields to the electrical conductivity. Cr ions have various valences of 2+, 3+, 4+, 5+, 6+ and the symmetry of Cr is 4h with 6 coordination numbers which can change the local structure of SrTiO3. Besides, Ti ions in SrTiO3 have 67 pm and Cr has symmetry of 4h for the valence of 3+. Under these conditions, Cr will reduce the lattice parameters and a slight shift of apical oxygen to the basal plane will be observed. Since Cr interact with electromagnetic wave in the range of visible light, it might be expected that this compound would show a shift of band gap energy. As the valence also changes to a possible mixed state, the physical properties may exist in complex states. SrTi1-xCrxO3 samples were prepared via solid-state reaction in the various molar ratio of Cr doping. The phase and structure were analyzed using X-ray Diffraction. XRD confirmed that SrTi1-xCrxO3 compounds phase were formed and a slight change in lattice parameters was observed. The local octahedral sixfold symmetry structure of SrTi1-xCrxO3 compounds also changed to be tetragonal with the presence of Cr. Based on the EDX data, the composition of SrTi1-xCrxO3 compounds corresponded to the composition designed. Furthermore, the magnetic field induced I-V conductivity measurement showed that higher Cr fraction enhanced its electrical conductivity. The optical band gap analysis from UV-Vis spectroscopy showed that the band gap reduce accordingly.

Keywords
Magnetic driven, SrTiO3, Cr, conductivity, band gap

Topic
Magnetic Methods

Link: https://ifory.id/abstract/UWqe3F9MPnKC

Corresponding Author
Nordiana Mohd Muztaza

Institutions
a)Geophysics Section, School of Physics, 11800, Universiti Sains Malaysia, Penang, Malaysia.
*mmnordiana[at]usm.my

b)Centre for Global Archaeological Research Malaysia, 11800, Universiti Sains Malaysia, Penang, Malaysia

c)Department of Geology, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract
Bukit Bunuh is situated in Lenggong valley, north of Kota Tampan, Perak state, Malaysia. Meteor impact crater is also known as a small impact crater and has approximately circular depression in the surface of the Earth. This paper present the magnetic map for Bukit Bunuh impact structure presented in a form of contouring image. To detect the impact structure and its structural attribute, a series of magnetic profiles were measure across the suspected area. Magnetic measurement was conducted using Geometric G-856 Proton Precision magnetometers to measure the earth-s total magnetic field and the data was processed using Surfer8 software. Analytic signal map was produced showing low magnetic value which indicate as impact crater filled with sediments, surrounded by high magnetic value which interpreted as rebounds zone. Crater dimensions are estimated about 5 km with central uplift at the Bukit Bunuh area.

Keywords
Bukit Bunuh; Magnetic; Analytic signal; Impact crater

Topic
Magnetic Methods

Link: https://ifory.id/abstract/EyFCYKgRJqPn

Corresponding Author
Nabella Sholeha

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
b) Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
*markus.diantoro.fmipa[at]um.ac.id

Abstract
SrTiO3 known as high thermoelectric and ferroelectric materials. Introducing different orbitals may produce an anomalous optoelectric effect. In turn, the materials might also be used as an active solar cell electrode beside of thermoelectric and supercapacitors materials. Thermoelectric and supercapacitor have been widely developed as an alternative energy harvesting and storage device since the fossil energy resources are limited in nature. Thermoelectric materials generate electrical energy from thermal energy, which is abundant and produced every day. SrTiO3 perovskite provides d0 configuration with an energy gap of 3.2 eV and possesses ferroelectric properties. Ni doping using various valence of +2, +3, +4 at Ti site in SrTiO3 compound will modify the normal octahedral configuration, in turn, it will change a micro elastic, crystal field, or coloumbic interactions. Macroscopically, we will observe the physical properties of, e.g., magnetoelectric conductivity. In the compound uses as a raw material of thermoelectric or supercapacitor, we will also obtain double advantages of the magnetic field around the material. Besides, doping Ni element is effective in suppressing heat transfer along with increasing phonon scattering at point defects. SrTi1-xNixO3 was prepared by solid-state reaction followed by sintering process at 860 oC in bulk. The microstructure of SrTi1-xNixO3 was analyzed by XRD and SEM-EDX. XRD data analysis with Cu-Kα wavelength that lattice parameters and normal octahedral structures in SrTiO3 were shifted after doping Ni. The EDX analysis confirmed that the elemental content of the sample corresponds to the designed composition. Thermoelectric and supercapacitor properties were carried out by inducing magnetic field during dielectric and electrical conductivity measurement. Higher Ni stoichiometric fraction contributed to raising electrical conductivity. Thus it will potentially enhance the figure of merit (ZT) and charge-discharge current of SrTi1-xNixO3 as thermoelectric and supercapacitor devices. The photodetectors measurement of Ni-doped SrTi1-xNixO3 is also detailed discuss in this work.

Keywords
photoelectric, thermoelectric, supercapacitor, Ni, SrTiO3, magnetic field, electrical conductivity.

Topic
Magnetic Methods

Link: https://ifory.id/abstract/aYA4JLR9FyfU

Corresponding Author
Wahyu Hidayat

Institutions
1). Geophysical Engineering Department
Faculty of Technology Mineral, UPN “Veteran” Yogyakarta
*wahyu.hidayat[at]upnyk.ac.id

Abstract
Mud Volcano is a phenomenon that is often discussed by people. The case of the emergence of mud volcano in Sidoarjo, East Java, or it is better recognized as "LUSI" has attracted the attention to the lots of researchers and the general community. The effects of the destruction of infrastructure and damage to the environment around the emergence of the Mud Volcano are issues that need special attention. The potential for mud volcano has been recorded in lots of locations in Java, both active and interpreted based on rock deposits. One of the areas indicated to be an ancient mud volcano is the Cengklik Lake area of, Boyolali Regency, Central Java, which is the area of this research. The research was conducted using the geomagnetic method. The measurement was conducted around CengklikLake to the east following rock outcrops which are identified as mud volcano deposits. The interpretation is conducted based on the results of data processing that has been corrected daily variation and IGRF. Several filters have been applied to obtain the desired information. The results have shown a low magnetic anomaly value which spread from Cengklik Lake, AdiSumarmo Airport on the west side and spread eastward continuously until around the outcrop which was identified as ancient volcanic deposits. This pattern of low magnetic anomaly values is interpreted as a result of mud volcano deposits in the area.

Keywords
mud volcano, geomagnetic, infrastructure

Topic
Magnetic Methods

Link: https://ifory.id/abstract/xKgcEZNmPtGp

Corresponding Author
Endang Ciptawati

Institutions
Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia

Corresponding author: fauziatul.fajaroh.fmipa[at]um.ac.id

Abstract
Zinc ferrite (ZnFe2O4) nanoparticle is one of the semiconductor materials that can be used as a catalyst in photodegradation of Malachite Green. In this research, the synthesis of ZnFe2O4 nanoparticle using coprecipitation method with microwave assistance and its effectiveness in photodegradation of Malachite Green was studied. ZnFe2O4 nanoparticles with NaOH concentration variations of 1 M, 1.5 M, and 2 M had been successfully synthesized based on the results of XRD characterization. The peaks produced are following JCPDS Card No. 22–1012. The analysis of BET method showed that the surface area of ZnFe2O4 nanoparticles with NaOH concentrations of 1 M, 1.5 M, and 2 M are 1030.268, 225.193, and 1974.447 m2/g respectively. In addition, photodegradation result of Malachite Green showed that ZnFe2O4 nanoparticles with NaOH concentration of 2 M was able to degrade 88.5% of malachite green in 90 minutes.

Keywords
coprecipitation method, photodegradation, zinc ferrite

Topic
Magnetic Methods

Link: https://ifory.id/abstract/GKaE6xUhADjw

Corresponding Author
Eva Khikmiatul Maula

Institutions
(a)Department of Physics, Faculty of Mathematics and Natural Science, State University of Malang. Jl. Semarang 5 Malang, 65145 Indonesia
*nandang.mufti.fmipa[at]um.ac.id
(b)Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia
(c)Department of Chemical Engineering, Petronas Technology University. Bandar Seri Iskandar, 32610, Perak, Malaysia

Abstract
The Effect of Thickness of Fe3O4 Film on the Nature of Photoelectrochemical (PEC) from Fabricated Fe3O4/ZnO Film Using Spin Coating Method Nandang Mufti(1,2)*, Eva Khikmiatul Maula(1), Yudyanto(1,2), Chusnana Insjaf Yogihati(1,2), Suriati Sufian(3), M. Tommy Hasan Abadi(1), Siti Maryam(1) 1Department of Physics, Faculty of Mathematics and Natural Science, State University of Malang. Jl. Semarang 5 Malang, 65145 Indonesia 2Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia 3Department of Chemical Engineering, Petronas Technology University. Bandar Seri Iskandar, 32610, Perak, Malaysia *Corresponding Author : nandang.mufti.fmipa@um.ac.id ABSTRACT: Photoelectrochemical (PEC) water splitting converts solar energy into electrical energy, and stored it in the form of hydrogen and oxygen molecules. In PEC system, semiconductor electrodes play an important role in the conversion of solar energy; ZnO is one of the semiconductor materials with excellent electrical properties which is suitable for an electrodes. However, wide band gap of ZnO about 3.37 eV only can be utilized for photon energy in the UV region of about 4%. Henceforth, a combination of ZnO with Fe3O4 is predicted to have advantages such as being able to absorb visible light, low toxicity, and easy achievement, therefore photoactivation can be improved. In this present study, Fe3O4/ZnO films were fabricated using spin coating and doctor blade methods. The XRD result shows that the crystal structure of ZnO and Fe3O4 are hexagonal and cubic spinel, respectively. while the thickness of Fe3O4, ZnO, and Fe3O4/ZnO can be seen in Cross-sectional SEM test. Fe3O4 layer can increase PEC efficiency, where the efficiency value produced in Fe3O4/ZnO film is 0.15%, greater than the single layer of ZnO film is 0.035% and a single layer of Fe3O4 film is 0.038%. Keywords: Photoelectrochemical, Crystal Structure, Efficiency

Keywords
Photoelectrochemical, Crystal Structure, Efficiency

Topic
Magnetic Methods

Link: https://ifory.id/abstract/urBtFjkXQmfP

Corresponding Author
Susilawati Susilawati

Institutions
Physics Education, FKIP, University of Mataram, Lombok, West Nusa Tenggara Indonesia

Abstract
Barium M-hexaferriteswas synthesized with Co-Ni doping ion BaFe12-2xCoxNixO19) based on natural iron sand of Loang Balok beach in Sekarbela Subdistrict of Mataram Indonesia to be applied as micro wave absorbent material by using co precipitation method. To increase the effect of doping ion concentration variation (x = 0,0., 0,6 and 1,0) and calcinations temperature (T = 80, 600, and 800oC) on structure properties in samples was done by XRD (X-Ray Diffraction), SEM (Scanning Electron Microscopy) -EDX, TEM. Characterization of XRD showed in samples of iron oxide barium phase (BaFe12O19) and hematite phase (Fe2O3). The SEM-EDX results in the BaFe12CoNiO19 sample showed that the sample size had reached the nano-size ranging from 41nm to 151nm which was evenly distributed with the composition Ba = 12.22%; Fe = 49.1%; Co = 8.78%; Ni = 4.76%; And O = 21.37% with a slight impurity of Cl 3.77% whereas the TEM results show the resulting structure is hexagonal.

Keywords
Barium M-hexaferrites, Structure, nanopowder, co-precipation

Topic
Magnetic Methods

Link: https://ifory.id/abstract/geGEr8Y3kxVj