Structural and dielectric behavior of TlNbXO{sub 6} (X = W, Mo) ceramics
- Indian Inst. of Tech., Kharagpur (India). Dept. of Physics and Meteorology
Polycrystalline samples of TlNbXO{sub 6} (X = W, Mo) were prepared by a high-temperature solid-state reaction technique. Room temperature X-ray diffraction (XRD) studies confirmed the formation of single-phase compounds with an orthorhombic structure. Variation of dielectric constant ({var_epsilon}) and loss tangent (tan{delta}) with frequency (1--1000 kHz) and temperature (room temperature to 600 K) showed that TlNbWO{sub 6} had a ferroelectric-like dielectric anomaly at 330 {+-} 5 K whereas TlNbMoO{sub 6} did not exhibit any such anomaly in the said temperature range. The sharp fall of dc resistivity (10{sup 6} to 10{sup 3} {Omega}m) with rise in temperature showed the superionic nature of the compounds in the high-temperature region.
- OSTI ID:
- 329116
- Journal Information:
- Journal of Solid State Chemistry, Vol. 141, Issue 1; Other Information: PBD: 15 Nov 1998
- Country of Publication:
- United States
- Language:
- English
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