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- W4386084315 abstract "In this study, we present the results of a search for new stable structures of SrC 2$$ {}_2 $$ O 5$$ {}_5 $$ and BaC 2$$ {}_2 $$ O 5$$ {}_5 $$ in the pressure range of 0-100 GPa based on the density functional theory and crystal structure prediction approaches. We have shown that the recently synthesized pyrocarbonate structure SrC 2$$ {}_2 $$ O 5$$ {}_5 $$ - P21/c$$ P{2}_1/c $$ is thermodynamically stable for both SrC 2$$ {}_2 $$ O 5$$ {}_5 $$ and BaC 2$$ {}_2 $$ O 5$$ {}_5 $$ . Thus, SrC 2$$ {}_2 $$ O 5$$ {}_5 $$ - P21/c$$ P{2}_1/c $$ is stable relative to decomposition reaction above 10 GPa, while the lower-pressure stability limit for BaC 2$$ {}_2 $$ O 5$$ {}_5 $$ - P21/c$$ P{2}_1/c $$ is 5 GPa, which is the lowest value for the formation of pyrocarbonates. For SrC 2$$ {}_2 $$ O 5$$ {}_5 $$ , the following polymorphic transitions were found with increasing pressure: P21/c→Fdd2$$ P{2}_1/cto Fdd2 $$ at 40 GPa and 1000 K, Fdd2→C2$$ Fdd2to C2 $$ at 90 GPa and 1000 K. SrC 2$$ {}_2 $$ O 5$$ {}_5 $$ - Fdd2$$ Fdd2 $$ and SrC 2$$ {}_2 $$ O 5$$ {}_5 $$ - C2$$ C2 $$ are characterized by the framework and layered structures of [CO 4$$ {}_4 $$ ] 4-$$ {}^{4-} $$ tetrahedra, respectively. For BaC 2$$ {}_2 $$ O 5$$ {}_5 $$ , with increasing pressure, decomposition of BaC 2$$ {}_2 $$ O 5$$ {}_5 $$ - P21/c$$ P{2}_1/c $$ into BaCO 3$$ {}_3 $$ and CO 2$$ {}_2 $$ is observed at 34 GPa without any polymorphic transitions." @default.
- W4386084315 created "2023-08-24" @default.
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- W4386084315 date "2023-08-23" @default.
- W4386084315 modified "2023-10-06" @default.
- W4386084315 title "Crystal structures and <i>P–T</i> phase diagrams of SrC2$$ {}_2 $$O5$$ {}_5 $$ and BaC2$$ {}_2 $$O5$$ {}_5 $$" @default.
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- W4386084315 doi "https://doi.org/10.1002/jcc.27210" @default.
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