Non-isothermal reaction mechanism and kinetic analysis for the synthesis of monoclinic lithium zirconate (m-Li2ZrO3) during solid-state reaction

被引:14
作者
Yasno, Juan P. [1 ]
Conconi, Susana [1 ,2 ]
Visintin, Arnaldo [2 ,3 ]
Suarez, Gustavo [1 ,2 ]
机构
[1] UNLP, CONICET, CIC, CETMIC Technol Ctr Mineral Resources & Ceram, Cno Centenario & 506, RA-1897 Buenos Aires, DF, Argentina
[2] Natl Univ La Plata UNLP, Fac Exact Sci, Dept Chem, RA-1900 La Plata, Buenos Aires, Argentina
[3] UNLP, CONICET, INIFTA Res Inst Theoret & Appl Phys Chem, CC 16,Suc 4, RA-1900 La Plata, Buenos Aires, Argentina
关键词
M-Li2ZrO3; Solid-state reaction kinetics; Non-isothermal; TG-DTA; XRD; COMMITTEE RECOMMENDATIONS; CRYSTALLIZATION KINETICS; ICTAC KINETICS; LI2ZRO3; METAZIRCONATE; DECOMPOSITION; PERFORMANCE; REDUCTION; TRANSPORT; SORPTION;
D O I
10.1186/s40543-021-00267-5
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Non-isothermal reaction mechanism and kinetic analysis for the synthesis of monoclinic lithium zirconate (m-Li2ZrO3) were investigated by processing of TG-DTA, along with XRD, DLS, and HRTEM. For this purpose, the solid-state reaction of Li2CO3 with ZrO2 was carried out by TG-DTA at different heating rates (10, 20, and 30 degrees C/min) from room temperature to 1100 degrees C. The thermal data was used to calculate the kinetic parameters by two types of isoconversional methods: Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS). The reaction mechanism was determined by the model-fitting method, applying the Coats-Redfern (CR) approximation to the different solid-state reaction models. The results confirmed the formation of pure m-Li2ZrO3, consists of semispherical particles of about 490 nm, using a very short reaction time. The average activation energy obtained by FWO and KAS methods were 274.73 and 272.50 kJ/mol, respectively. It was found that the formation of m-Li2ZrO3 from Li2CO3 with ZrO2 is governed by the three-dimensional diffusion mechanism. Based on these results, a microscopic reaction model of the formation of m-Li2ZrO3 was proposed.
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页数:13
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