Cation Disorder in Ferroelectric Ba₄M₂Nb₁₀O₃₀ (M = Na, K, and Rb) Tetragonal Tungsten Bronzes.

ABSTRACT: The crystal structure of tetragonal tungsten bronzes, with the general formula A1₂A2₄C₄B1₂B2₈O₃₀, is flexible both from a chemical and structural viewpoint, resulting in a multitude of compositions. The A1 and A2 lattice sites, with different coordination environments, are usually regarded to be occupied by two different cations such as in Ba₄Na₂Nb₁₀O₃₀ with Na⁺ and Ba²⁺ occupying the A1 and A2 sites, respectively. Here, we report on a systematic study of the lattice site occupancy on the A1 and A2 sites in the series Ba₄M₂Nb₁₀O₃₀ (M = Na, K, and Rb). The three compounds were synthesized by a two-step solid-state met

SUBMITTER: Nylund IE 

PROVIDER: S-EPMC9533300 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature