Chemical Pressure Effect on the Stabilization of Rock-Salt ZnO-Lin-2MeOn-1 Solid Solutions Synthesized at High Pressure

Petr S Sokolov; Andrey N Baranov; Vladimir L Solozhenko

doi:10.3390/ma16155336

Chemical Pressure Effect on the Stabilization of Rock-Salt ZnO-Li_n-2MeO_n-1 Solid Solutions Synthesized at High Pressure

Materials (Basel). 2023 Jul 29;16(15):5336. doi: 10.3390/ma16155336.

Authors

Petr S Sokolov¹, Andrey N Baranov², Vladimir L Solozhenko¹

Affiliations

¹ LSPM-CNRS, Université Sorbonne Paris Nord, 93430 Villetaneuse, France.
² Chemistry Department, Moscow State University, 119991 Moscow, Russia.

Abstract

Metastable ZnO-Li_n-2MeO_n-1 (Me = Sc³⁺, Ti⁴⁺, Ta⁵⁺) solid solutions with a rock-salt structure were synthesized through the solid-state reaction of ZnO with Li_n-2Meⁿ⁺O_n-1 (n = 3, 4, 5) complex oxides at 7.7 GPa and 1300-1500 K. In all investigated systems, single-phase rock-salt solid solutions can be quenched down to ambient conditions in a wide (up to 80 mol% ZnO) concentration range. The phase composition, thermal stability, and thermal expansion of the recovered rock-salt solid solutions were studied by synchrotron powder X-ray diffraction. At ambient pressure, these solid solutions exhibit high thermal stability (up to 1000 K), with the decomposition temperature and decomposition products depending on the nature of the multiple charge cations.

Keywords: ZnO solid solutions; chemical pressure; high-pressure synthesis; thermal expansion; thermal stability.

Grants and funding

This research received no external funding.