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Structural Phase Transitions in the Ferromagnetic Vanadium Oxide NaV6O11 by Yasushi Kanke; Fujio Izumi; Yukio Morii; Etsuo Akiba; Satoru Funahashi; Katsuo Kato; Mitsumasa Isobe; Eiji Takayama-Muromachi; Yoshishige Uchida is a Materials Science article available to read on EtoBox.

What is Structural Phase Transitions in the Ferromagnetic Vanadium Oxide NaV6O11 about?

Neutron and X-ray diffraction experiments revealed that ferromagnetic \(\mathrm{NaV}_{6} \mathrm{O}_{11}\left(T_{\mathrm{C}}=64.2 \mathrm{~K}\right)\) undergoes two-step second-order structural phase transitions upon cooling: hexagonal ( \(\mathrm{P6}_{3} /\) \(m m c) \rightarrow\) hexagonal \(\left(P 6_{3} m c\right) \rightarrow\) orthorhombic ( \(C m c 2_{1}\) ). Its structure at \(200 \mathrm{~K}\) was determined by single-crystal X-ray analysis: hexagonal, \(P 6_{3} m c, a=5.7049(2) \AA, c=13.0796(8) \AA\), and \(Z=2\). The \(\mathrm{P6}_{3} / \mathrm{mmc} \rightarrow \mathrm{P6}_{3} m c\) transition is believed to accompany a magnetic transition at \(245 \mathrm{~K} . \mathrm{V}(1)\) octahedra, which construct an edgesharing kagomé-type network, form a trimer on the \(P 6_{3} / m m c \rightarrow\) \(\mathrm{P6}_{3} m c\) transition. V(2) octahedra, which form face-sharing dimers, separate into two nonequivalent types on the hexagonal-hexagonal transition. The \(P 6_{3} m c \rightarrow C m c 2_{1}\) transition occurs at a temperature between 35 and \(40 \mathrm{~K}\), which is lower than \(T_{\mathrm{c}} . \mathrm{V}(1)\) octahedra split into two nonequivalent types on the \(\m

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Author

Yasushi Kanke; Fujio Izumi; Yukio Morii; Etsuo Akiba; Satoru Funahashi; Katsuo Kato; Mitsumasa Isobe; Eiji Takayama-Muromachi; Yoshishige Uchida

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0022-4596)

Published

1994

Language

EN

Field

Materials Science (Physical Sciences)