Phase transitions in A4Li(HSO4)3(SO4); A = Rb, K: Single crystal X-ray diffraction studies

Journal of Chemical Sciences

T N Guru Row1¹  G Nalini¹ 

[1] Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India$$

关键词: Phase transition;    ferroelastic;    cryo-crystallography;    crystal structure.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

The crystal structure of ferroelastic Rb4Li(HSO4)3(SO4) has been determined at two temperatures, which indicates a structural phase transition, tetragonal 𝑃43 with 𝑎 = 7.629(1) Å, 𝑐 = 29.497(2) Å at 293 K and monoclinic 𝑃21 with 𝑎 = 7.583(3) Å, 𝑏 = 29.230(19) Å, 𝑐 = 7.536(5) Å, 𝛽 = 90.14(1)° at 90 K. The crystal structure of K4Li(HSO4)3(SO4)4 has also been determined at two temperatures, tetragonal 𝑃41 with 𝑎 = 7.405(1) Å, 𝑐 = 28.712(6) Å at 293 K and tetragonal 𝑃41 with 𝑎 = 7.371(5) Å, 𝑐 = 28.522(5) Å at 100 K. The overall coordination features in both the structures have been analysed in terms of bond valence sum calculations.

【 授权许可】

Unknown