Shift–Twin Option in Eight-Layer Hexagonal Perovskite Niobates Ba8MNb6O24

Two new eight-layer hexagonal perovskites with the composition Ba8MNb6O24 (M = Fe and Cu) are synthesized by solid-state reaction at 1350–1400 °C. Their crystal structures have been investigated using X-ray and electron diffractions as well as high-resolution transmission electron microscopy. Althou...

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Veröffentlicht in:Inorganic chemistry 2020-11, Vol.59 (22), p.16375-16384
Hauptverfasser: Yin, Congling, Tao, Fengqiong, Zhao, Lei, Wang, Xiaoming, Ming, Xing, Liang, Chaoping, Kuang, Xiaojun
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Sprache:eng
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Zusammenfassung:Two new eight-layer hexagonal perovskites with the composition Ba8MNb6O24 (M = Fe and Cu) are synthesized by solid-state reaction at 1350–1400 °C. Their crystal structures have been investigated using X-ray and electron diffractions as well as high-resolution transmission electron microscopy. Although both compounds have similar M2+ size, Ba8FeNb6O24 and Ba8CuNb6O24 adopt shifted and twinned structures, respectively. Through comparison with the reported shifted Ba8MNb6O24 (M = Mn, Co, and Zn) and twinned Ba8NiNb6O24 as well as inexistent Ba8Mg­(Nb/Ta)6O24, we elucidate that the twin–shift competition of Ba8MNb6O24 family could be related with multiple chemical factors including tolerance factors, B-cationic size difference, entropy variation with B-cation and vacancy disorder, Jahn–Teller distortion, and FSO B–B d orbit interactions.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.0c02165