Structural Conditionality of the Ionic Conductivity of MTiORO{sub 4} (M = K, Rb; R = P, As) Single Crystals

The ionic conductivity σ{sub ||c} along the crystallographic axis c and the structural imperfection of the lattices of KTiOPO{sub 4}, RbTiOPO{sub 4}, and RbTiOAsO{sub 4} single crystals with low defect concentration, grown by the high temperature solution growth technique, have been investigated by...

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Bibliographic Details
Published inCrystallography reports Vol. 63; no. 2
Main Authors Sorokin, N. I., Novikova, N. E., Shaldin, Yu. V., Tseitlin, M.
Format Journal Article
LanguageEnglish
Published United States 15.03.2018
Subjects
ARSENIC IONS
CATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALLOGRAPHY
IMPEDANCE
IONIC CONDUCTIVITY
MONOCRYSTALS
PHOSPHORUS IONS
POTASSIUM IONS
RUBIDIUM IONS
SPECTROSCOPY
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION
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Summary:The ionic conductivity σ{sub ||c} along the crystallographic axis c and the structural imperfection of the lattices of KTiOPO{sub 4}, RbTiOPO{sub 4}, and RbTiOAsO{sub 4} single crystals with low defect concentration, grown by the high temperature solution growth technique, have been investigated by impedance spectroscopy and X-ray diffraction analysis. Isomorphic substitutions of Rb{sup +} ions for conduction K{sup +} cations in MTiOPO{sub 4} crystals decreases the σ{sub ||c} value, whereas the substitution of As{sup 5+} ions for framework P{sup 5+} cations in RbTiORO{sub 4} crystals increases the σ{sub ||c} value. The σ{sub ||c} values at 573 K are found to be 1.0 × 10{sup –5}, 5.7 × 10{sup –6}, 2.0 × 10{sup –6}, and 3.3 × 10{sup –5} S/cm for the KTiOPO{sub 4}, RbTiOPO{sub 4} {100}, RbTiOPO{sub 4} {201}, and RbTiOAsO{sub 4} crystals, respectively (the growth zone of the crystalline boule from which the samples were cut is indicated in braces).
ISSN:1063-7745
1562-689X
DOI:10.1134/S106377451802027X