Bismuth and Thermal Induced Electrical Conductivity of High Temperature Thermoelectric SrTi1-xBixO3 System
Markus Diantoro, Sefia Kharen Gilar Tiana, Chusnana I Y, Thathit Suprayogi

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

Energy demand is increasing significantly, while conventional energy resources are limited. Various work was carried out by developing and exploring materials which are potentially applied as an alternative renewable energy device. Nowadays, the utilization of thermal energy attracts the research interest due to its abundant quantities. Thus, thermoelectric as a thermal conversion device into electrical energy is the best alternative for confronting this matter. Thermoelectric studies continue to be encouraged, one of them is SrTiO3 based material. For investigating the scientific information and its application, a comprehensive study was needed by modifying the local structure using Bi dopant on SrTi1-xBixO3 system. SrTi1-xBixO3 was prepared via solid-state reaction followed by calcination, molding process, and sintering at 860 C. In this work, the various molar ratio of Bi doping was performed. Substitution of Bi in Ti position of SrTiO3 was intended to find its potential as a high-temperature thermoelectric material. SrTi1-xBixO3 samples were characterized by X-ray Diffraction. A single phase of the compound and a slight change of lattice parameters were identified. Loading amount of Bi changed the octahedral local structure of 6-fold symmetry to tetragonal. SEM-EDX was used to observe the morphology and elemental composition. EDX data analysis showed the composition of samples in accordance with the composition designed. SrTi1-xBixO3 was measured with I-V meter to calculate the electrical conductivity and dielectric constant. Thermoelectric properties were confirmed by inducing temperature during electrical conductivity measurement. Increasing Bi fraction raised the electrical conductivity, thus it corresponded that the material potentially enhanced the figure of merit (ZT) of SrTi1-xBixO3 system. Analysis of dopant in micro size and their physical properties will be discussed in detail.

Keywords: thermoelectric, SrTi1-xBixO3, solid-state reaction, structure, thermal induced conductivity

Topic: Renewable Energy

Link: https://ifory.id/abstract-plain/WF9zvCcPR4bN

Web Format | Corresponding Author (Sefia Kharen Gilar Tiana)