Preparation, crystal structure and characterization of alpha-NaSbP2S6 and beta-NaSbP2S6 phases
Abstract
The new phases α-NaSbP2S6 and β-NaSbP2S6 were synthesized by ceramic and reactive flux methods at 773 K. The structures of α-NaSbP2S6 and β-NaSbP2S6 were determined by the single-crystal X-ray diffraction technique. α-NaSbP2S6 crystallizes in the monoclinic space group P21/c with a = 11.231(2) Å, b = 7.2807(15) Å, c = 11.640(2) Å, β = 108.99(3)°, V = 900.0(3) Å3 and z = 4. β-NaSbP2S6 crystallizes in the monoclinic space group P21 with a = 6.6167(13) Å, b = 7.3993(15) Å, c = 9.895(2) Å, β = 92.12(3) °, V = 484.10(17) Å3 and z = 2. The α- and β-phases of NaSbP2S6 are closely related, the main difference lies in the stacking of the [Sb[P2S6]]n n- layers. The structure of α-NaSbP2S6 consists of two condensed layers (MPS3 type) to give an ABAB... sequence with Na+ cations located in the interlayer space. The packing of β-NaSbP2S6 is formed by monolayers of [Sb[P2S6]]n n- stacked in an AA... fashion separated by a layer of Na+ cations. Both phases are derivates of the M1+M3+P2Q6 family. The optical band gaps of α-NaSbP2S6 and β-NaSbP2S6 were determined by UV-vis diffuse reflectance measurements to be 2.17 and 2.25 eV, respectively. © 2006 Elsevier Ltd. All rights reserved.
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Título según WOS: | Preparation, crystal structure and characterization of alpha-NaSbP2S6 and beta-NaSbP2S6 phases |
Título según SCOPUS: | Preparation, crystal structure and characterization of a-NaSbP2S6 and ß-NaSbP2S6 phases |
Título de la Revista: | MATERIALS RESEARCH BULLETIN |
Volumen: | 41 |
Número: | 7 |
Editorial: | PERGAMON-ELSEVIER SCIENCE LTD |
Fecha de publicación: | 2006 |
Página de inicio: | 1337 |
Página final: | 1344 |
Idioma: | English |
URL: | http://linkinghub.elsevier.com/retrieve/pii/S0025540806000031 |
DOI: |
10.1016/j.materresbull.2005.12.006 |
Notas: | ISI, SCOPUS - ISI |