High-Pressure Synthesis of Sc
| Autor: | Lucien, Eisenburger, Valentin, Weippert, Oliver, Oeckler, Wolfgang, Schnick |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Chemistry (Weinheim an Der Bergstrasse, Germany) |
| ISSN: | 1521-3765 |
| Popis: | Multinary transition metal nitrides and oxonitrides are a versatile and intriguing class of compounds. However, they have been investigated far less than pure oxides. The compounds Sc5P12N23O3 and Ti5P12N24O2 have now been synthesized from the binary nitrides ScN and TiN, respectively, by following a high‐pressure high‐temperature approach at 8 GPa and 1400 °C. NH4F acts as a mineralizing agent that supports product formation and crystallization. The starting materials ScN and TiN are seemingly an uncommon choice because of their chemical inertness but, nevertheless, react under these conditions. Sc5P12N23O3 and Ti5P12N24O2 crystallize isotypically with Ti5B12O26, consisting of solely vertex‐sharing P(O/N)4 tetrahedra forming two independent interpenetrating diamond‐like nets that host TM(O/N)6 (TM=Sc, Ti) octahedra. Ti5P12N24O2 is a mixed‐valence compound and shows ordering of Ti3+ and Ti4+ ions. The oxonitridophosphates Sc5P12N23O3 and Ti5P12N24O2 have been prepared by high‐pressure high‐temperature reactions from the refractory nitrides ScN and TiN, respectively. These reactions were enabled by the addition of NH4F as a mineralizing agent. The crystal structures were elucidated by a combination of SCXRD, BVS calculations and magnetic measurements for Ti5P12N24O2 revealing two distinct crystallographic sites occupied by either Ti3+ or Ti4+, respectively. |
| Databáze: | OpenAIRE |
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