Electrical and magnetic properties of quaternary rare earth thiophosphate: K4Sm2[PS4]2[P2S6]

Abstract

O tiofosfato quaternário de metal alcalino e terra rara K 4 Sm 2 [PS 4 ] 2 [P 2 S 6 ] foi sintetizado pelo método cerâmico e caracterizado por difratometria de raios X de pó (XRD), microscopia eletrônica de varredura com microanálise de raios X (SEM-EDX), medidas de impedância eletroquímica e medidas magnéticas. A estrutura cristalina consiste

KREP2S6 (RE = Sm, Gd, Tb, Dy): A Series of Polar Rare-Earth Thiophosphates with High Laser-Induced Damage Thresholds and Moderate Nonlinear-Optical Responses Synergistically Contributed by Isolated P2S6 Units and {[RE2S15]24–}∞ Layers

“…Assuming that there is a ninth Sm–S ( pseudo ) bond in 1 , which links with P 2 S 6 units to form the same connection code as LaS 9 in KLaP 2 S 6 does, the ninth Sm–S distance is 3.8235(9) Å. In previously reported Sm thiophosphates containing SmS 9 units, the Sm–S bond lengths are 2.868(2)–3.165(2) Å in NaSmP 2 S 6 and 2.8456(8)–3.2829(9) Å in K 4 Sm 2 (P 2 S 6 )(PS 4 ) 2 . Therefore, the pseudo bond in 1 is unreasonable.…”

“…In previously reported Sm thiophosphates containing SmS 9 units, the Sm−S bond lengths are 2.868(2)−3.165(2) Å in NaSmP 2 S 6 45 and 2.8456(8)− 3.2829(9) Å in K 4 Sm 2 (P 2 S 6 )(PS 4 ) 2 . 46 Therefore, the pseudo bond in 1 is unreasonable. When we compare the connection styles of RE 3+ ions in a {[Sm 2 P 4 S 19 ] 16− } ∞ layer and a {[La 2 P 4 S 22 ] 22− } ∞ bilayer (Figure S3), it can be found that the structural distortion degree of the four-membered ring formed by Sm 3+ ions is larger than that formed by La 3+ ions.…”