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Noncentrosymmetric rare-earth selenides RE4InSbSe9 (RE = La–Nd)

The quaternary rare-earth selenides RE4InSbSe9 (RE = La–Nd) were prepared by reactions of RE, Sb2Se3, In2Se3, and Se at 1023–1123 K. They adopt the La4InSbS9-type structure (tetragonal, space group P41212, Z = 8, a = 10.4777(4)–10.6499(4) Å, c = 29.0384(11)–29.4790(12) Å) containing anionic helical...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-07, Vol.710, p.424-430
Main Authors: Yin, Wenlong, Iyer, Abishek K., Li, Chao, Yao, Jiyong, Mar, Arthur
Format: Article
Language:English
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Summary:The quaternary rare-earth selenides RE4InSbSe9 (RE = La–Nd) were prepared by reactions of RE, Sb2Se3, In2Se3, and Se at 1023–1123 K. They adopt the La4InSbS9-type structure (tetragonal, space group P41212, Z = 8, a = 10.4777(4)–10.6499(4) Å, c = 29.0384(11)–29.4790(12) Å) containing anionic helical chains [In2Sb2Se11]10− extending along the c-direction separated by La3+ cations and isolated Se2− anions. Consistent with the black colour of the crystals, an optical band gap of 1.76(2) eV was deduced from the UV–vis–NIR diffuse reflectance spectrum for the La member. Magnetic measurements on the Pr and Nd members indicated paramagnetic behaviour with no ordering down to 2 K. [Display omitted] •RE4InSbSe9 are the first quaternary phases in the RE–In–Sb–Se system.•The structure contains isolated anionic helical chains [In2Sb2Se11].•La4InSbSe9 has an optical band gap of 1.76 eV, consistent with its black colour.•Pr4InSbSe9 and Nd4InSbSe9 are paramagnetic with no ordering down to 2 K.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.03.278