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DC electrical conduction in strontium vanadium borate glasses
Materials Science-Poland ( IF 1.1 ) Pub Date : 2020-06-01 , DOI: 10.2478/msp-2020-0022
Arunkumar V. Banagar 1 , M. Prashant Kumar 2 , N. Nagaraja 1 , Anand Tipperudra 1 , Sangamesh Jakati 3
Affiliation  

Abstract A series of borate glasses with the composition x(SrO)·(50 – x)V2O5·0.5(B2O3) where x = 0, 0.1, 0.2, 0.3 and 0.4 were prepared by melt-quenching technique. The non-crystalline nature of the glasses has been established by XRD studies. Room temperature density and DC electrical conductivity of the samples were investigated in the temperature range of 300 K to 443 K. The molar volume and oxygen packing density (OPD) were estimated. The results show that the density, molar volume and OPD decrease with the increasing of SrO mole fraction. The DC electrical conductivity data has been analyzed in the light of Mott’s small polaron hopping (SPH) model and the activation energies were estimated. The conductivity was observed to rapidly fall and activation energy was found to increase when SrO was incorporated into the glass network. This may indicate that Sr+ ions have not contributed to the total conductivity and the observed conductivity may be of polaronic type only, which is due to the hopping of electrons between multivalent states of vanadium. Various small polaron hopping parameters such as small polaron radius, rp, effective dielectric constant, ϵp, polaron band width, J, optical phonon frequency, υo, small polaron coupling constant, γp, density of states at Fermi level, N(EF) were estimated and discussed.

中文翻译:

锶钒硼酸盐玻璃中的直流电传导

摘要 采用熔淬技术制备了一系列硼酸盐玻璃,其组成为x(SrO)·(50 – x)V2O5·0.5(B2O3),其中x = 0、0.1、0.2、0.3 和0.4。玻璃的非结晶性质已通过 XRD 研究确定。在 300 K 至 443 K 的温度范围内研究了样品的室温密度和直流电导率。估计了摩尔体积和氧堆积密度 (OPD)。结果表明,密度、摩尔体积和OPD随着SrO摩尔分数的增加而减小。根据 Mott 的小极化子跳跃 (SPH) 模型分析了直流电导率数据,并估计了活化能。当 SrO 掺入玻璃网络时,观察到电导率迅速下降,活化能增加。这可能表明 Sr+ 离子对总电导率没有贡献,观察到的电导率可能仅为极化子类型,这是由于电子在钒的多价态之间跳跃所致。各种小极化子跳跃参数,如小极化子半径、rp、有效介电常数、ϵp、极化子带宽、J、光声子频率、υo、小极化子耦合常数、γp、费米能级态密度 N(EF)估计和讨论。
更新日期:2020-06-01
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