Synthesis and crystal structure of layer scandotitanates Sr2LnScTiO7

TitleSynthesis and crystal structure of layer scandotitanates Sr2LnScTiO7
Publication TypeJournal Article
Year of Publication2015
AuthorsTitov, Yu.A, Belyavina, NM, Markiv, VYa., Slobodyanik, MS, Polubinskii, VV
Abbreviated Key TitleDopov. Nac. akad. nauk Ukr.
DOI10.15407/dopovidi2015.02.130
Issue2
SectionChemistry
Pagination130-136
Date Published2/2015
LanguageUkrainian
Abstract
The boundary of a region with layered perovskite-like structure (LPS) in the rows of $\rm Sr_{2}LnScTiO_{7}$-type compounds is determined. The new scandotitanates $\rm Sr_{2}LnScTiO_{7}$ $\rm (Ln= La,\ Pr,\ Nd,\ Sm)$ have been synthesized by the solid-phase sintering from equimolar mixtures $\rm Sr_{2}TO_{4}+LnScO_{3}$ or $\rm SrLn_{2}Sc_{2}O_{7}+ Sr_{3}Ti_{2}O_{7}$, and their crystal LPSs are determined by the Rietveld method. It is found that the LPS of $\rm Sr_{2}LnScTiO_{7}$ belong to the $\rm SrLn_{2}Sc_{2}O_{7}$-type structure (sp. gr. Fmmm). The final $R_{B}$ values are equal to 0.073–0.079. The peculiarities of the LPS of $\rm Sr_{2}LnInTiO_{7}$ are analyzed and shown that the "adding" of the second layer of octahedrons in perovskite-like blocks of $\rm Sr_{2}TiO_{4}$ by perovskites $\rm LnB^{III}O_{3}$ destabilizes the LPS.
Keywordscrystal structure, layer scandotitanates, synthesis
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