Synthesis and Characterization of the Rubidium Thiophosphate Rb6(PS5)(P2S10) and the Rubidium Silver Thiophosphates Rb2AgPS4, RbAg5(PS4)2 and Rb3Ag9(PS4)4 |
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| Authors: | Fatimah Alahmari Bambar Davaasuren Jayaprakash Khanderi Alexander Rothenberger |
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| Affiliation: | Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955–6900, Saudi Arabia |
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| Abstract: | The metal thiophosphates Rb2AgPS4 ( 2 ), RbAg5(PS4)2 ( 3 ), and Rb3Ag9(PS4)4 ( 4 ) were synthesized by stoichiometric reactions, whereas Rb6(PS5)(P2S10) ( 1 ) was prepared with excess amount of sulfur. The compounds crystallize as follows: 1 monoclinic, P21/c (no. 14), a = 17.0123(7) Å, b = 6.9102(2) Å, c = 23.179(1) Å, β = 94.399(4)°; 2 triclinic, P$\bar{1}$ (no. 2), a = 6.600(1) Å, b = 6.856(1) Å, c = 10.943(3) Å, α = 95.150(2)°, β = 107.338(2)°, γ = 111.383(2)°; 3 orthorhombic, Pbca (no. 61), a = 12.607(1) Å, b = 12.612(1) Å, c = 17.759(2) Å; 4 orthorhombic, Pbcm (no. 57), a = 6.3481(2) Å, b = 12.5782(4) Å, c = 35.975(1) Å. The crystal structures contain discrete units, chains, and 3D polyanionic frameworks composed of PS4 tetrahedral units arranged and connected in different manner. Compounds 1 – 3 melt congruently, whereas incongruent melting behavior was observed for compound 4 . 1 – 4 are semiconductors with bandgaps between 2.3 and 2.6 eV and thermally stable up to 450 °C in an inert atmosphere. |
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| Keywords: | Chalcophosphates Thiophosphate Alkali metal thiophosphate Rubidium‐Silver thiophosphates |
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