AC conductivity and dielectric relaxation of Se80−xTe20Bix (x=6, 12) glasses

IF 0.3 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B Pub Date : 2019-12-18 DOI:10.13036/17533562.60.6.014

D. Deepika, Hukum Singh

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引用次数: 0

Abstract

The present paper reports the ac conductivity and dielectric relaxation of Se80−xTe20Bix (x=6, 12) glasses at various temperatures and frequencies. It was found that ac conductivity increases on increase of frequency, temperature as well as Bi content. The increase in conductivity is due to the formation of lower energy Se–Bi and Te–Bi bonds which takes the system to a stable lower energy configuration. The values of frequency exponent (s) were calculated and it was found that samples obey CBH model of conduction. Density of states (N(Ef)) near the fermi level were calculated at different temperatures and it was found that addition of Bi increases the number of localised states in the tails which leads to increase in ac conductivity. Further, it was found that dielectric parameters increase with increase in temperature. However, a decrease in both dielectric constant (ε′) and dielectric loss ((ε″) was observed with increase in frequency. Beside this, dielectric relaxation time (τ) and activation energy of relaxation (∆Eτ) were also determined for both the samples under study and was found to be lower for Se68Te20Bi12 glass.

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Se80−xTe20Bix (x= 6,12)玻璃的交流电导率和介电弛豫

本文报道了Se80−xTe20Bix (x= 6,12)玻璃在不同温度和频率下的交流电导率和介电弛豫。结果表明，导电率随频率、温度和铋含量的增加而增加。电导率的提高是由于形成了较低能量的Se-Bi和Te-Bi键，使系统处于稳定的较低能量构型。计算了频率指数s的值，发现样品符合CBH传导模型。在不同温度下计算了费米能级附近的态密度(N(Ef))，发现Bi的加入增加了尾部局域态的数量，从而导致交流电导率的增加。此外，还发现介电参数随温度的升高而增大。然而，随着频率的增加，介电常数(ε′)和介电损耗(ε″)都有所降低。除此之外，还测定了两种样品的介电弛豫时间(τ)和弛豫活化能(∆Eτ)，发现Se68Te20Bi12玻璃的介电弛豫时间(τ)更低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B 工程技术-材料科学：硅酸盐

CiteScore

0.70

自引率

33.30%

发文量

审稿时长

1 months

期刊介绍： Physics and Chemistry of Glasses accepts papers of a more purely scientific interest concerned with glasses and their structure or properties. Thus the subject of a paper will normally determine the journal in which it will be published.