5 years ago

Topochemical Crystal Transformation from a Distorted to a Nearly Perfect Kagome Cuprate

Topochemical Crystal Transformation from a Distorted to a Nearly Perfect Kagome Cuprate
Koichi Kindo, Hajime Ishikawa, Akira Matsuo, Takeshi Yajima, Masashi Tokunaga, Atsushi Miyake, Zenji Hiroi
Single crystals are indispensable for understanding the fundamental properties of materials, although obtaining them are often challenging. To investigate the magnetic properties of a kagome-lattice antiferromagnet, we have performed a topochemical crystal transformation from a copper mineral volborthite with a distorted kagome lattice into another copper mineral vesignieite with an almost perfect kagome lattice. A millimeter-sized crystal of vesignieite, which is difficult to prepare via direct chemical reactions, has been successfully obtained. Magnetization measurements on the crystals reveal a unique magnetic order with weak-ferromagnetic moments lying within the kagome plane and successive anomalies in the magnetization curve, which would give important information on the magnetic order of the kagome-lattice antiferromagnet. The present results demonstrate a novel route via the topochemical crystal transformation in preparing a hard-to-obtain crystal.

Publisher URL: http://dx.doi.org/10.1021/acs.chemmater.7b01448

DOI: 10.1021/acs.chemmater.7b01448

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