Solid-state MAS NMR investigations for pentavalent cation-replaced pollucite compounds with a negative thermal expansion coefficient

Pollucite compounds with an aluminosilicate structure, V-replaced pollucite, Cs 0.7 V 0.1 Al 0.8 Si 2.1 O 6 (CVAS), P-replaced pollucite, Cs 0.7 P 0.1 Al 0.8 Si 2.1 O 6 (CPAS), and Nb-replaced pollucite, Cs 0.7 Nb 0.1 Al 0.8 Si 2.1 O 6 (CNbAS), were synthesized by a multistep heat treatment of 550–1...

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