Mechanochemical Syntheses of Perovskite KMIIF3 with Cubic Structure (MII = Mg, Ca, Mn, Fe, Co, Ni, and Zn)

Jaeryeong Lee; Heeyoung Shin; Jaechun Lee; Hunsaeng Chung; Qiwu Zhang; Fumio Saito

doi:10.2320/matertrans.44.1457

Mechanochemical Syntheses of Perovskite KM^IIF₃ with Cubic Structure (M^II = Mg, Ca, Mn, Fe, Co, Ni, and Zn)

Jaeryeong Lee, Heeyoung Shin, Jaechun Lee, Hunsaeng Chung, Qiwu Zhang, Fumio Saito

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Keywords: mechanochemical synthesis; fluoroperovskite (KM^IIF₃); Rietveld refinement; structural distortion

JOURNAL FREE ACCESS

2003 Volume 44 Issue 7 Pages 1457-1460

DOI https://doi.org/10.2320/matertrans.44.1457

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Abstract

An equi-molar mixture of potassium fluoride (KF) and one of alkaline-earth or transition metal fluoride M^IIF₂ (M^II = Mg, Ca, Mn, Fe, Co, Ni, and Zn) was ground in air by using a planetary ball mill to investigate mechanochemical (MC) synthesis of fluoroperovskites KM^IIF₃. Rietveld refinement for the ground mixtures was conducted on the basis of XRD data to inquire into structural properties of the KM^IIF₃ synthesized mechanochemically. The synthesis reactions proceed with grinding time, and ultimately a single phase of cubic structural KM^IIF₃ (Pm3m, Z=1) was obtained after grinding for 21.6 ks. The values of unit cell parameter, a, of KM^IIF₃ synthesized by MC reaction, are slightly larger than those by solid-state reaction at high temperature, and this may be attributed to structural distortions caused by intensive grinding.

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