Bulletin of Materials Science

, Volume 23, Issue 4, pp 239–241 | Cite as

Phase transitions in Na2TeO4 ceramics

  • N. K. Singh
  • R. N. P. Choudhary
Phase Transitions
Received:
Revised:

Abstract

Polycrystalline samples of NaTeO4 were prepared by conventional solid-state reaction technique at low temperature (600° C). X-ray powder diffraction (XRD) technique was used to check the formation of single phase NaTeO4 compound with cell parametersa = 10·602(1) åb = 70·622(1) å andc = 8·506(1) å in orthorhombic crystal system. Detailed studies of dielectric constant (ε) (and loss tangent (tan δ) as a function of frequency (400 Hz-10 kHz) and temperature (−120°C–260°C) show that the compound has two phase transitions in the ferroelectric phase.

Keywords

Polycrystalline phase transition ceramics dielectric constant 
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Copyright information

© Indian Academy of Sciences 2000

Authors and Affiliations

  • N. K. Singh
    • 1
  • R. N. P. Choudhary
    • 1
    • 2
  1. 1.University Department of PhysicsAraIndia
  2. 2.Department of Physics and MeteorologyIndian Institute of TechnologyKharagpurIndia

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