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

Vijaya Krishna, Seetepalli; Pavić, Luka; Bafti, Arijeta; Pisk, Jana; Bhadrarao, Dhanisetti; Rao, Yeti Dana; Sekhar, Ayyagari Venkata; Babu, Vandana Chitti; Kumar, Vandana Ravi; Veeraiah, Nalluri (2024) Impact of Cr3+/Mo6+/W6+ Doping on Dipolar Relaxation and AC Conductivity in Li2O–Al2O3–SiO2 Glasses. Physica status solidi A-applications and materials science, 221 (16). ISSN 1862-6300

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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 (omega) 10(-2)-10(6) Hz and temperature (T) 20-240 degrees C. Initial characterization of the samples by means of optical absorption spectra reveals that Cr ions do persist in Cr(3+)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 sigma(ac) are observed to be the largest for 40Li(2)O-5Al(2)O(3)-52SiO(2):3.0 MoO3 (LASMo) glass followed by 40Li(2)O-5Al(2)O(3)-52SiO(2):3.0 WO3 (LASW) and 40Li(2)O-5Al(2)O(3-)52SiO(2):3.0 Cr2O3 (LASCr) glasses. Analysis of dipolar relaxation phenomena are carried out using Cole-Cole plots. Analysis of the results of sigma(ac) 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.

Item Type:	Article
Uncontrolled Keywords:	AC conductivity; Cr2O3/MoO3/WO3 metal oxides; dielectric features; Li2O-Al2O3-SiO2 glass systems
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics NATURAL SCIENCES > Chemistry
Divisions:	Division of Materials Chemistry
Depositing User:	Luka Pavić
Date Deposited:	14 Jan 2026 10:11
URI:	http://fulir.irb.hr/id/eprint/10386
DOI:	10.1002/pssa.202400243

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