Microwave processing of SrBi2Nb2O9 ferroelectric ceramics was targeted in the current work. In particular, Curie temperature, dielectric constant, dielectric loss and dc conductivity were studied for microwave sintered SrBi2Nb2O9 ferroelectric ceramics in the range 1050-1200 °C. The space charge dielectric relaxation was found noticeable in all sintered samples and electrical properties like dielectric constant, loss and dc conductivity were significantly affected due to this dielectric relaxation. An optimum processing condition was targeted by investigating frequency and temperature dependent dielectric responses along with dc conductivity. © 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Vaibhav Shrivastava

Physics

(SoNS) School of Natural Sciences

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Shiv Nadar University

Ceramics International

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 doubleε′-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 (γ→ γ″ ′) 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. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Journal of Materials Science: Materials in Electronics

Integrating third phase transition and CO/CO2 contamination in microwave tailored Bi2Mo1−xWxO6 nano materials

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Materials Letters

Dielectric studies of La and Pb doped SrBi2Nb2O9 ferroelectric ceramic

Journal of Alloys and Compounds

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Microwave processed SrBi2Nb2O9 ferroelectric ceramics with controlled dielectric relaxation and metallic conduction