Polymorphism of Ba2SiP4

Haffner, Arthur; Weippert, Valentin und Johrendt, Dirk (2020): Polymorphism of Ba2SiP4. In: Zeitschrift für Anorganische und Allgemeine Chemie, Bd. 646, Nr. 3: S. 120-124

Abstract

The three‐dimensional SiP4 network in the known phosphidosilicate Ba2SiP4‐tI28 is analogous to β‐Cristobalite if oxygen is formally replaced by P–P dimers. Here we report a second polymorph Ba2SiP4‐oP56 [Pnma, a = 12.3710(4) Å, b = 14.6296(7) Å, c = 7.9783(3) Å; Z = 8] with chains of SiP4 tetrahedra connected by P–P bonds, reminiscent to the elusive fibrous SiO2. Ba2SiP4 is enantiotropic. The high temperature polymorph Ba2SiP4‐oP56 transforms to the low‐temperature phase Ba2SiP4‐tI28 at 650 °C and reconstructs to the high‐temperature modification at 1100 °C. DFT calculations predict an indirect optical bandgap of about 1.7 eV.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Chemie und Pharmazie > Department Chemie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 0044-2313
• Bemerkung: Special Issue: Dedicated to Professor Hans‐Jörg Deiseroth on the Occasion of his 75th Birthday
• Sprache: Englisch