Premium
M m H n ( X O 4 ) ( m + n )/2 crystals: structure, phase transitions, hydrogen bonds, conductivity. I. K 9 H 7 (SO 4 ) 8 ·H 2 O crystals – a new representative of the family of solid acid conductors
Author(s) -
Makarova Irina,
Grebenev Vadim,
Dmitricheva Elena,
Dolbinina Valentina,
Chernyshov Dmitry
Publication year - 2014
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520613029892
Subject(s) - crystallography , hydrogen bond , atmospheric temperature range , crystal (programming language) , molecule , crystal structure , ion , diffusion , chemistry , phase (matter) , phase transition , materials science , condensed matter physics , physics , thermodynamics , organic chemistry , computer science , programming language
To reveal the structural conditionality for anomalies in physical properties, including dielectric and optical properties, diffraction studies of K 9 H 7 (SO 4 ) 8 ·H 2 O crystals were performed using synchrotron radiation in the temperature range 293–450 K and determined at 405 K, taking H atoms into account. The results indicate that the occurrence of high conductivity in K 9 H 7 (SO 4 ) 8 ·H 2 O crystals with a temperature increase is associated with the outward diffusion of water molecules, hydrogen‐bond network rearrangement and the formation of channels for the possible motion of K + ions. A rearranged system of hydrogen bonds consists of permanent bonds and partly of dynamically disordered bonds. Hydrogen‐bond rearrangement and the hindered back diffusion of water to the crystal bulk stabilize the high‐temperature crystal structure right down to room temperature.