VELÁZQUEZ, Matias; PECHEV, Stanislav; DUTTINE, Mathieu; WATTIAUX, Alain; LABRUGÈRE, Christine; VEBER, Philippe; BUFFIERE, Sonia; DENUX, Dominique

doi:10.1016/j.jssc.2018.05.013

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VELÁZQUEZ, Matias
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PECHEV, Stanislav
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DUTTINE, Mathieu
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Solid State Chemistry. 2018, vol. 264, p. 91-97

Elsevier

Résumé en anglais

New Sr6Tb0.94Fe1.06(BO3)6 single crystals were obtained from lithium borate high-temperature solution growth under controlled atmosphere. Their average crystal structure was found to adopt the trigonal R-3 space group with lattice parameters a = 12.2164 Å and c = 9.1934 Å. A combined multiscale characterization approach, involving diffuse reflectance, X-ray photoelectron (XPS) and Mössbauer spectroscopies, was undertaken to establish the exact nature of the point defect disorder in this crystal structure. The FeTb× antisite disorder in the Sr6Tb0.94Fe1.06(BO3)6 single crystals is different from the kind of point defect disorder known to exist in the powder phase material counterpart. The absence of Tb4+ cations in the crystal lattice was established by XPS, and that of any phase transition down to 4 K was checked by specific heat measurements. The magnetic susceptibility curve was found to follow a Curie-Weiss behaviour in the 4–354 K temperature range.< Réduire

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High-temperature solution growth

Tb compounds

Mössbauer spectroscopy

Borate

Single crystal

X-ray diffraction

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Point defect disorder in high-temperature solution grown Sr6Tb0.94Fe1.06(BO3)6 single crystals

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