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Crystallization of M I Ge 2 (PO 4 ) 3 (M I – Na, K, Ag) from molten phosphate media
Author(s) -
Terebilenko K. V.,
Slobodyanik N. S.,
Ogorodnyk I.V.,
Baumer V. N.
Publication year - 2014
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201300367
Subject(s) - crystallization , crystallography , valence (chemistry) , chemistry , solubility , germanium , analytical chemistry (journal) , trigonal crystal system , crystal structure , silicon , organic chemistry , chromatography
A number of NASICON‐related M I Ge 2 (PO 4 ) 3 (M I – Na, K, Ag) have been prepared using a high‐temperature solution method in the molten system M I ‐Ge‐P‐O (M I – Na, K) based on the solubility data for GeO 2 at 1123 K for the Na‐P‐O system and 1173 K for the K‐P‐O one. The single crystals of AgGe 2 (PO 4 ) 3 were obtained after crystallization of a melt with Ag/P = 1.4. It crystallizes in the trigonal system, space group R‐3, cell parameters a = 8.06340(1) Å, c = 21.8385(4) Å, Z = 6. The framework is built up from two GeO 6 units that are isolated from each other by PO 4 tetrahedra to form the main building block of the structure [Ge 2 (PO 4 ) 3 ] − . Two types of silver cations M1 and M2 are found to have different coordination requirements shown by the bond valence sum calculations.