Impact of Cr3+/Mo6+/W6+ Doping on Dipolar Relaxation and AC Conductivity in Li2O–Al2O3–SiO2 Glasses

IF 1.9 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Physica Status Solidi A-applications and Materials Science Pub Date : 2024-07-04 DOI:10.1002/pssa.202400243
Seetepalli Vijaya Krishna, Luka Pavić, Arijeta Bafti, Jana Pisk, Dhanisetti Bhadrarao, Yeti Dana Rao, Ayyagari Venkata Sekhar, Vandana Chitti Babu, Vandana Ravi Kumar, Nalluri Veeraiah
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Abstract

In this investigation, results of dielectric features of Li2O–Al2O3–SiO2 (LAS) glass doped with 3.0 mol% of Cr2O3, MoO3, and WO3 are presented. The investigation spans broad regions of frequency (ω) 10−2–106 Hz and temperature (T) 20–240 °C. Initial characterization of the samples by means of optical absorption spectra reveals that Cr ions do persist in Cr3+oxidation state, whereas fractions of Mo and W ions do present in Mo5+ and W5+ states in addition to predominant presence Mo6+ and W6 + ions, respectively. Infrared spectra suggest that Mo5+ and W5+ ions involve in modifying the network of the glass and induced structural disorder. Dielectric parameters and also σac are observed to be the largest for 40Li2O–5Al2O3–52SiO2:3.0 MoO3 (LASMo) glass followed by 40Li2O–5Al2O3–52SiO2:3.0 WO3 (LASW) and 40Li2O–5Al2O3–52SiO2:3.0 Cr2O3 (LASCr) glasses. Analysis of dipolar relaxation phenomena are carried out using Cole–Cole plots. Analysis of the results of σac suggests that polaronic conduction due to electron transfer between Mo5+ ↔ Mo6+ and W5+ ↔ W6+ is prevailed in case of LASMo and LASW glasses and these glasses are predicted to be useful as cathodes, whereas in LASCr glass, ionic conductivity is dominant and is suitable for electrolytes in ionic batteries.
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Cr3+/Mo6+/W6+ 掺杂对 Li2O-Al2O3-SiO2 玻璃中双极性弛豫和交流电导率的影响
本研究介绍了掺杂 3.0 mol% Cr2O3、MoO3 和 WO3 的 Li2O-Al2O3-SiO2 (LAS) 玻璃的介电特性结果。研究跨越了频率 (ω) 10-2-106 Hz 和温度 (T) 20-240 °C 的宽广区域。通过光学吸收光谱对样品进行的初步表征显示,铬离子始终处于 Cr3+ 氧化态,而 Mo 和 W 离子除了主要存在 Mo6+ 和 W6+ 离子外,还分别处于 Mo5+ 和 W5+ 状态。红外光谱表明,Mo5+ 和 W5+ 离子参与了玻璃网络的改变,并导致结构紊乱。据观察,40Li2O-5Al2O3-52SiO2:3.0 MoO3(LASMo)玻璃的介电参数和σac 最大,其次是 40Li2O-5Al2O3-52SiO2:3.0WO3(LASW)和 40Li2O-5Al2O3-52SiO2:3.0Cr2O3(LASCr)玻璃。利用科尔-科尔图分析了偶极弛豫现象。对σac结果的分析表明,在LASMo和LASW玻璃中,由于Mo5+ ↔ Mo6+和W5+ ↔ W6+之间的电子转移,极性传导占主导地位,预计这些玻璃可用作阴极,而在LASCr玻璃中,离子传导占主导地位,适合用作离子电池的电解质。
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
393
审稿时长
2 months
期刊介绍: The physica status solidi (pss) journal group is devoted to the thorough peer review and the rapid publication of new and important results in all fields of solid state and materials physics, from basic science to applications and devices. Among the largest and most established international publications, the pss journals publish reviews, letters and original articles, as regular content as well as in special issues and topical sections.
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