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Synthesis and Characterization of the Quaternary Thioaluminogermanates A (AlS 2 )(GeS 2 ) ( A = Na, K)
Author(s) -
AlBloushi Mohammed,
Davaasuren Bambar,
Emwas AbdulHamid,
Rothenberger Alexander
Publication year - 2015
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201500021
Subject(s) - tetragonal crystal system , crystallography , tetrahedron , alkali metal , crystal structure , band gap , quaternary , chemistry , materials science , geology , optoelectronics , organic chemistry , paleontology
The quaternary thioaluminogermanates Na(AlS 2 )(GeS 2 ) ( 1 ) and K(AlS 2 )(GeS 2 ) ( 2 ) crystallize in the tetragonal space group I 4/ mcm (no. 140) with unit cell parameters a = 7.4274(11) Å, c = 5.8560(12) Å for Na(AlS 2 )(GeS 2 ) and a = 7.8826(2) Å, c = 5.8642(4) Å for K(AlS 2 )(GeS 2 ). The crystal structure comprises of one‐dimensional [(AlS 2 )(GeS 2 )] – anionic chains with Al and Ge sharing the tetrahedral site. The alkali metal cations fill the square antiprismatic voids between chains. Both 1 and 2 are semiconductors with bandgap of around 3.6 eV and 3.5 eV, respectively.