Temperature dependent negative permittivity in solid solutions Sr2Mn1-xSnxO4 (x=0, 0.3, 0.5)

被引：18
|
作者：
Nirala, Gurudeo [1 ]
Yadav, Dharmendra [1 ]
Katheriya, Tarun [1 ]
Upadhyay, Shail [1 ]
机构：
[1] Indian Inst Technol BHU, Dept Phys, Varanasi 221005, Uttar Pradesh, India
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2022年 / 42卷 / 02期
关键词：
Sr2MnO4; Negative permittivity; AC conductivity; Sn substituted Sr2Mn1-xSn(x)O(4); DIELECTRIC-PROPERTIES; METAMATERIALS; PEROVSKITE; NANOCOMPOSITES; PERFORMANCE; RESONANCE; BEHAVIOR; LAYER;
D O I：
10.1016/j.jeurceramsoc.2021.10.056
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A few compositions of the system Sr2Mn1-xSnxO4 (x = 0.0, 0.3, 0.5) were synthesized in the air by the solid-state ceramic route. A change in the sign (positive to negative) of the permittivity above a particular temperature (TC) is observed at all the measured frequencies. The negative permittivity was analyzed by the Drude-Lorentz model. It was found that negative permittivity is caused by the plasma oscillations of thermally excited free charge carriers. Analysis of XPS spectra confirmed the presence of mixed-valence states of both Mn (Mn4+ and Mn3+) and Sn (Sn4+ and Sn2+) ions. The UV-vis.-IR spectroscopy results indicated generation of a large number of defect states in the forbidden bandgap region of Sr2MnO4 on the substitution of Sn at Mn site. Synthesized samples are promising metamaterials for radio frequency (10 Hz-2 MHz) region applications due to the high -temperature plasmonic behavior.
引用
收藏
页码：453 / 461
页数：9
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