{"title":"Optimization of the Tetragonal-to-Cubic Phase Transition of Lithium Lanthanum Zirconate Solid Electrolyte with the Use of Mechanical Activation","authors":"G. B. Kunshina, I. V. Bocharova, A. M. Kalinkin","doi":"10.1134/S002016852470081X","DOIUrl":null,"url":null,"abstract":"<p>We have studied the effect of mechanical activation and subsequent sintering on the formation of solid electrolyte powder with a cubic structure and the composition Li<sub>6.4</sub>Al<sub>0.2</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> (LLZ) during solid-state synthesis with the use of the low-melting-point crystalline hydrates (ZrO(NO<sub>3</sub>)<sub>2</sub>∙2H<sub>2</sub>O, Al(NO<sub>3</sub>)<sub>3</sub>∙9H<sub>2</sub>O, and La(NO<sub>3</sub>)<sub>3</sub>∙6H<sub>2</sub>O). Mechanical activation of the sinter cake after the first synthesis step at 900°C, in an AGO-2S planetary mill in 4 × 1 min mode at a relative centrifugal force of 20<i>g</i> led to the formation of powder with a particle size <i>d</i> = 0.42 μm, as evaluated from its specific surface area. Subsequent sintering of the mechanically activated LLZ powder at 1000°C for 4 h ensured a complete transformation of tetragonal LLZ into a highly conductive cubic phase, <i>c</i>-LLZ. The room-temperature ionic conductivity of <i>c</i>-LLZ was 2 × 10<sup>–4</sup> S/cm, as determined by electrochemical impedance spectroscopy.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"60 5","pages":"676 - 685"},"PeriodicalIF":0.9000,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S002016852470081X","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
We have studied the effect of mechanical activation and subsequent sintering on the formation of solid electrolyte powder with a cubic structure and the composition Li6.4Al0.2La3Zr2O12 (LLZ) during solid-state synthesis with the use of the low-melting-point crystalline hydrates (ZrO(NO3)2∙2H2O, Al(NO3)3∙9H2O, and La(NO3)3∙6H2O). Mechanical activation of the sinter cake after the first synthesis step at 900°C, in an AGO-2S planetary mill in 4 × 1 min mode at a relative centrifugal force of 20g led to the formation of powder with a particle size d = 0.42 μm, as evaluated from its specific surface area. Subsequent sintering of the mechanically activated LLZ powder at 1000°C for 4 h ensured a complete transformation of tetragonal LLZ into a highly conductive cubic phase, c-LLZ. The room-temperature ionic conductivity of c-LLZ was 2 × 10–4 S/cm, as determined by electrochemical impedance spectroscopy.
期刊介绍:
Inorganic Materials is a journal that publishes reviews and original articles devoted to chemistry, physics, and applications of various inorganic materials including high-purity substances and materials. The journal discusses phase equilibria, including P–T–X diagrams, and the fundamentals of inorganic materials science, which determines preparatory conditions for compounds of various compositions with specified deviations from stoichiometry. Inorganic Materials is a multidisciplinary journal covering all classes of inorganic materials. The journal welcomes manuscripts from all countries in the English or Russian language.