Title | Synthesis and crystal structure of layer scandotitanates Sr2LnScTiO7 |
Publication Type | Journal Article |
Year of Publication | 2015 |
Authors | Titov, Yu.A, Belyavina, NM, Markiv, VYa., Slobodyanik, MS, Polubinskii, VV |
Abbreviated Key Title | Dopov. Nac. akad. nauk Ukr. |
DOI | 10.15407/dopovidi2015.02.130 |
Issue | 2 |
Section | Chemistry |
Pagination | 130-136 |
Date Published | 2/2015 |
Language | Ukrainian |
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.
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Keywords | crystal structure, layer scandotitanates, synthesis |
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