Structural and Dielectric Behavior of TlNbXO6(X=W, Mo) Ceramics

✍ Scribed by Tanika Kar; R.N.P. Choudhary

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 292 KB
• Volume: 141
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.7913

✦ Synopsis

Polycrystalline samples of TlNbXO 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 ( ) and loss tangent (tan ) with frequency (1-1000 kHz) and temperature (room temperature to 600 K) showed that TlNbWO 6 had a ferroelectric-like dielectric anomaly at 330؎5 K whereas TlNbMoO 6 did not exhibit any such anomaly in the said temperature range. The sharp fall of dc resistivity (10 6 to 10 3 m) with rise in temperature showed the superionic nature of the compounds in the high-temperature region.

1998 Academic Press

RESULTS AND DISCUSSION

The sharp and single peaks of the XRD patterns of both of the samples, which were different from those of the 50