The chlorides Ag₃MCl₆(M = DyLu, Y, Sc): Synthesis, structure, thermal expansion

Abstract

Chlorides Ag3MCl6 have been obtained with M = DyLu, Y, Sc from AgCl/MCl3 mixtures (sealed Pyrex ampoule, 380°C, 8 d). They crystallize like Na3GdCl6‐I with a “stuffed” LiSbF6‐type structure (R3, Z = 3). Thermal expansion was followed for Ag3HoCl6 and Ag3YCl6 and is remarkably different from that of Na3GdCl6‐I.

High-pressure phase and pressure-induced phase transition of Ag3YCl6

“…11,12 Given the similar ionic radii of Ag + (1.00 Å) and Na + (0.99 Å), 7 it is not surprising that the known structure of Ag 3 YCl 6 is isostructural with the hexagonal form of Na 3 YCl 6 . 13 However, no observation has been made for Ag 3 YCl 6 being isostructural with the monoclinic Na 3 YCl 6 , which could potentially function as an Ag ion conductor, akin to the Na 3 YCl 6 counterpart. While it is known that heating the hexagonal Ag 3 YCl 6 leads to phase transformation at 350 °C, the resulting phase remains unsolved.…”