Point defect disorder in high-temperature solution grown Sr6Tb0.94Fe1.06(BO3)6 single crystals - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2018

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

Résumé

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.
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Dates et versions

hal-01804526 , version 1 (31-05-2018)

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Matias Velázquez, Stanislav Pechev, Mathieu Duttine, Alain Wattiaux, Christine Labrugère, et al.. Point defect disorder in high-temperature solution grown Sr6Tb0.94Fe1.06(BO3)6 single crystals. Journal of Solid State Chemistry, 2018, 264, pp.91-97. ⟨10.1016/j.jssc.2018.05.013⟩. ⟨hal-01804526⟩
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