Synthesis and Characterization of Na4Si2Se6-tP24 and Na4Si2Se6-oP48, Two Polymorphs with Different Anionic Structures

DOI to cite this document:: 10.5283/epub.58690

Kamm, Franziska ; Pielnhofer, Florian

; Schlosser, Marc

; Pfitzner, Arno

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Date of publication of this fulltext: 25 Jul 2024 07:18

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Abstract

Two different polymorphs of the new selenosilicate Na4Si2Se6 were synthesized by solid-state reactions. The high-temperature polymorph Na4Si2Se6-tP24 crystallizes in the tetragonal space group P42/mcm (No. 132) with lattice parameters a = 7.2793(2) Å, c = 12.4960(4) Å, and V = 662.14(3) Å3. The main structural motifs are isolated Si2Se6 units of two edge-sharing SiSe4 tetrahedra. The ...