Compounds Sr2Ln4Ti2Ta4O22 (Ln = La, Pr) with heteroblock slab perovskite-like structure

TitleCompounds Sr2Ln4Ti2Ta4O22 (Ln = La, Pr) with heteroblock slab perovskite-like structure
Publication TypeJournal Article
Year of Publication2016
AuthorsTitov, Yu.A, Slobodyanik, MS, Chumak, VV
Abbreviated Key TitleDopov. Nac. akad. nauk Ukr.
DOI10.15407/dopovidi2016.02.096
Issue2
SectionChemistry
Pagination96-100
Date Published2/2016
LanguageUkrainian
Abstract

Phase ratios in systems Sr2Ln2Ti2Ta2O14+Ln2Ta2O8 (Ln = La, Pr), Sr2Ln2Ti2Ta2O14+2LnTaO4 (Ln = Nd, Sm), Sr2La2Ti2Nb2O14 + 2LaNbO4, and La4Ti4O14 + 2LaNbO4 are investigated. The formation of new compounds Sr2Ln4Ti2Ta4O22 (Ln = La, Pr) with heteroblock layered perovskitelike structure from the charge of co-precipitated hydroxycarbonates, whose heteroblocks include fourlayer block Sr2Ln2Ti2Ta2O14 and two-layer block Ln2Ta2O8, is established. The impossibility of a crystallochemical stabilization of two-layer blocks of high pressure modification Nd2Ta2O8 and La2Nb2O8 in {(4)(2)} heteroblocks of Sr-containing compounds is shown.
Keywordslayered perovskite-like structure, phase relations
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