Abstract
First layer Aurivillius Bismuth Molybdate Tungstate ceramic [Bi2Mo1−xWxO6 (BMoW); x = 0.00, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.08 and 0.10] compositions are prepared using deep penetrating microwave sintering in air. All samples show known perovskite phase formation just after 5 h calcinations at 575 °C. X-ray diffraction and transmission electron microscopy based energy dispersive spectroscopy are used to confirm the phase-purity and gross elemental concentration change besides particle size. Nearly double \(\varepsilon ^{\prime}\)-values are obtained for investigated BMoW materials compared to earlier reported values. Silver percolation through electrodes in bismuth oxide deficient surfaces of BMoW ceramic powders induces radio wave absorption in the frequency range 2 to 4 MHz. Characteristic third phase transition (\(\gamma \to \gamma ^{\prime\prime\prime}\)) of Bi2MoO6 material dissolves gradually on increasing tungsten concentration. The introduction of tungsten in BMo matrix increases the dipolar strength of MoO6 octahedrons bending against infrared absorption as evidenced from FTIR analysis. Additionally appearing FTIR peaks provide a strong indication of CO and CO2 contamination on exposed powder surfaces useful for photocatalytic applications.
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Acknowledgements
The authors gratefully acknowledge S.B. Srivastava (Graduate student) and Dr.S.P. Singh (both from SNU) for helping in thin film contact formation, Dr. Dileep Kumar, Mr. Suresh Bhardwaj, Dr. A.M. Awasthi and Dr. V.R. Reddy (all from UGC-DAE CSR Indore) for permitting us to record DSC and low frequency ferroelectric measurements. Authors also acknowledge the contributions of Dr. S. Amirthpandian (IGCAR-Kalapakkam) and Dr. Aloke Kanjilal (SNU) for providing TEM-EDS data and helping with results analysis respectively.
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Shrivastava, V., Pritam, A. & Joshi, A. Integrating third phase transition and CO/CO2 contamination in microwave tailored Bi2Mo1−xWxO6 nano materials. J Mater Sci: Mater Electron 29, 17388–17396 (2018). https://doi.org/10.1007/s10854-018-9836-z
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DOI: https://doi.org/10.1007/s10854-018-9836-z