LnV3Te3O15(OH)3路nH2O (Ln = Ce, Pr, Nd, Sm, Eu, Gd; n = 1鈥?): A New Series of Semiconductors with Mixed-Valent Tellurium (IV,VI) Oxo

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• 作者：Jian Lin ; Kariem Diefenbach ; Jingcheng Fu ; Justin N. Cross ; Ronald J. Clark ; Thomas E. Albrecht-Schmitt
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：September 2, 2014
• 年：2014
• 卷：53
• 期：17
• 页码：9058-9064
• 全文大小：383K
• ISSN：1520-510X

文摘

Six new lanthanide tellurium vanadates with the general formula LnV₃Te₃O₁₅(OH)₃路nH₂O (LnVTeO) (Ln = Ce, Pr, Nd, Sm, Eu, and Gd; n = 2 for Ce and Pr; n = 1 for Nd, Sm, Eu, and Gd) have been prepared hydrothermally via the reactions of lanthanide nitrates, TeO₂, and V₂O₅ at 230 掳C. LnVTeO adopts a three-dimensional (3D) channel structure with a space group of P6₃/mmc. Surprisingly, two types of oxoanions: Tep>IVp>O₃p>2鈥?/sup> trigonal pyramids and Tep>VIp>O₆p>6鈥?/sup> octahedra, coexist in these compounds. Solid-state UV鈥搗is鈥揘IR absorption spectra for LnVTeO show approximate band gaps on the order of 1.9 eV, suggesting the wide band gap semiconducting nature of these materials. No magnetic phase transition was observed in any of the analogues, but a clear increase in the strength of short-range antiferromagnetic correlations was found with the shortening of distances between magnetically coupled Lnp>3+p> ions in LnVTeO.