Phase transitions in Na2TeO4 ceramics

Bulletin of materials science

N K Singh¹  R N P Choudhary² 

[1] University Department of Physics, Ara 802 301, India$$University Department of Physics, Ara 802 301, IndiaUniversity Department of Physics, Ara 802 301, India$$;Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721 302, India$$Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721 302, IndiaDepartment of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721 302, India$$

关键词: Polycrystalline;    phase transition;    ceramics;    dielectric constant.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

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 parametersð‘�? = 10.602(1) Ã�?; ð‘�? = 70.622(1) Ã�? and ð‘�? = 8.506(1) Ã�? in orthorhombic crystal system. Detailed studies of dielectric constant (ðœ�?) (and loss tangent (tan ð›�?) as a function of frequency (400 Hzâ€�??10 kHz) and temperature (â€�?? 120°Câ€�??260°C) show that the compound has two phase transitions in the ferroelectric phase.

【 授权许可】

Unknown