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Published on: August 15, 2015
Enhanced Electrical Conductivity of (001) Oriented Sr0.9La0.1TiO3 Microplatelets for Thermoelectric Applications
Ping Zhang1, Penghui Chen1, Zhihao Lou1
1State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, NPU-QMUL Joint Research Institute of Advanced Materials and Structure, USI Institute of Intelligence Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
This study synthesized strontium lanthanum titanate (Sr$_{0.9}$La$_{0.1}$TiO$_{3}$) microplatelets using a topochemical conversion method. These microplatelets show enhanced electrical and reduced thermal conductivity, making them ideal for textured thermoelectric ceramics.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Ceramics Engineering
Background:
- Two-dimensional perovskite microplatelets are crucial templates for epitaxial grain growth in textured ceramics.
- Strontium lanthanum titanate (Sr$_{0.9}$La$_{0.1}$TiO$_{3}$) is a promising material for thermoelectric applications.
Purpose of the Study:
- To investigate the topochemical microcrystal conversion mechanism of Aurivillius Bi$_{4}$Ti$_{3}$O$_{12}$ to (001) oriented Sr$_{0.9}$La$_{0.1}$TiO$_{3}$ microplatelets.
- To characterize the morphology, phase evolution, and thermoelectric properties of the synthesized Sr$_{0.9}$La$_{0.1}$TiO$_{3}$ microplatelets.
Main Methods:
- Synthesis of (001) oriented Sr$_{0.9}$La$_{0.1}$TiO$_{3}$ microplatelets from Bi$_{4}$Ti$_{3}$O$_{12}$ precursors via molten salt reaction.
- Analysis of reaction interface, morphology development, and phase composition at various temperatures (above 753 °C, 950 °C, 1150 °C).
- Measurement of electrical conductivity (carrier concentration, mobility) and thermal conductivity.
Main Results:
- Topochemical nucleation and conversion of Bi$_{4}$Ti$_{3}$O$_{12}$ to Sr$_{0.9}$La$_{0.1}$TiO$_{3}$ were observed above 753 °C.
- At 1150 °C, Sr$_{0.9}$La$_{0.1}$TiO$_{3}$ microplatelets retained high aspect ratio with enhanced electrical conductivity (3.518 × 10$^{20}$ cm$^{-3}$ carrier concentration, 8.460 cm$^{2}$·V$^{-1}$·s$^{-1}$ mobility).
- Significantly decreased thermal conductivity was achieved, ranging from 5.65 W·m$^{-1}$·K$^{-1}$ at 300 K to 2.54 W·m$^{-1}$·K$^{-1}$ at 1073 K.
Conclusions:
- The topochemical microcrystal conversion provides a viable route to synthesize oriented Sr$_{0.9}$La$_{0.1}$TiO$_{3}$ microplatelets.
- These microplatelets exhibit excellent thermoelectric properties, suitable for template grain growth in textured thermoelectric ceramics.
- The findings pave the way for improved thermoelectric device performance through advanced ceramic processing.
