New quaternary alkali metal, rare earth (3+) thiophosphate, K2SmP2S7 with both [P2S6]4 and [PS4]3 anions
Author
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Manríquez Castro, Víctor
Author
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Galdámez Silva, Antonio
Author
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Guzmán Águila, Daniela
Admission date
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2014-01-08T13:23:26Z
Available date
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2014-01-08T13:23:26Z
Publication date
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2008
Cita de ítem
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Materials Research Bulletin 43 (2008) 2469–2475
en_US
Identifier
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doi:10.1016/j.materresbull.2007.07.028
Identifier
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https://repositorio.uchile.cl/handle/2250/121713
General note
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Artículo de publicación ISI
Abstract
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A new quaternary alkali metal, rare earth thiophosphate was synthesized by the ceramic method and characterized by single crystal X-ray diffraction: K2SmP2S7 crystallizes in the monoclinic space group C2 (no. 5) with the unit cell parameters
a = 22.746(5) A ° , b = 6.7362(13) A ° , c = 8.9004(18) A ° , b = 99.68(3)8, V = 1344.3(5) A ° 3 and Z = 2. The phase K2SmP2S7 can be better described as K4Sm2[PS4]2[P2S6] because it contains in the crystal structure both discrete anions [PS4]3 and [P2S6]4 . The crystal structure consists of infinite chains of 11[SmPS4] that are linked together through the ethane-like [P2S6]4 anions to form
two-dimensional layers. The packing of K2SmP2S7 is formed by layers of 2
1[Sm2[PS4]2[P2S6]]4 separated by K+ cations.
K2SmP2S7 was characterized by Raman and Fourier transform infrared (FTIR) spectroscopy and SEM-EDX microprobe analyses.
The optical band gap of K2SmP2S7 was determined by UV–vis diffuse reflectance measurements to be 2.59 eV.