Investigation of phase and dielectric properties of lead nickel tantalate ceramics

被引：3
|
作者：
Preeti [1 ]
Pandey, Adityanarayan [2 ,3 ]
Selvamani, Rachna [2 ]
Shekhar, Chander [1 ]
Gupta, S. M. [2 ,3 ]
机构：
[1] Amity Univ, Dept Appl Phys, Gurugram 122413, Haryana, India
[2] Raja Ramanna Ctr Adv Technol, Laser Mat Sect, Indore, Madhya Pradesh, India
[3] Homi Bhabha Natl Inst, Bombay, Maharashtra, India
来源：
FERROELECTRICS | 2017年 / 517卷 / 01期
关键词：
Lead nickel tantalite; pyrochlore; Rietveld refinement; dielectric relaxation; single-ionized oxygen defects; RELAXATION;
D O I：
10.1080/00150193.2017.1370265
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Lead nickel tantalate (PNT) ceramic was prepared by solid-state reaction method using 2-step columbite precursor route. Phase analysis of samples sintered at 1473 K shows PNT pyrochlore phase with minute peaks of NiO rich phase. 2-phase Rietveld refinement of x-ray diffraction patterns reveal similar to 92.4 (0.33) % pyrochlore phase (cubic structure; space group: Fd-3m; a = 10.5867(4) angstrom). From temperature dependent dielectric constant and dissipation factor study, strong frequency dependent dielectric anomaly within 140-240 K, related to relaxation rather than structural changes in PNT ceramic is obtained. Observed Arrhenius behavior of dielectric relaxation is believed to be associated with single-ionized oxygen defect hopping.
引用
收藏
页码：90 / 96
页数：7
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