Growth, structure and properties of (K1−(NH4) )9H7(SO4)8·H2O crystals
2014; Elsevier BV; Volume: 268; Linguagem: Inglês
10.1016/j.ssi.2014.09.028
ISSN1872-7689
AutoresЕ. В. Дмитричева, И. П. Макарова, В. В. Гребенев, В. В. Долбинина, И. А. Верин,
Tópico(s)Nonlinear Optical Materials Research
ResumoSingle crystals of (K1 − х(NH4)x)mHn(SO4)(m + n)/2·yH2O solid solutions are grown in the K3H(SO4)2–(NH4)3H(SO4)2–H2O system which end members are known to undergo superprotonic phase transitions with essentially different kinetics. Replacements in the cation sublattice and their influence on structural transitions as well as dielectric and optical properties of these crystals are of obvious interest both for fundamental and applied physics as new functional materials. Solutions of K3H(SO4)2 and (NH4)3H(SO4)2 with different ratio (K:NH4) crystallize in different structure types. The ratio 1:1 leads to the single crystals, which have the general formula ((K1 − x(NH4)х)9H7(SO4)8·H2O. The grown crystals are characterized and the crystal structure of the (K1 − х(NH4)x)mHn(SO4)(m + n)/2·H2O (x =0.04) crystal is solved. Data comparison for (K1 − х(NH4)x)mHn(SO4)(m + n)/2·H2O and K9H7(SO4)8·H2O crystals allows to establish structural conditionalities of differences in conductivity. One can assume that potassium ions are involved in the conductivity in addition to protons.
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