Synthese und Kristallchemie anorganischer Stoffe bei hohen Drücken und Temperaturen

High-Pressure Synthesis of -P3N5 at 11 GPa and 1500 °C in a Multianvil Assembly: A Binary Phosphorus(V) Nitride with a Three-Dimensional Network Structure from PN4 Tetrahedra and Tetragonal PN5 Pyramids

“…Soc. [8] A quite similar observation is made in the spinel structure of cubic g-Si 3 N 4 , in which the coordination numbers of silicon are partially increased from four to six compared to those in a-and b-Si 3 N 4 , which are the stable phases at normal pressure. [6] Rods from trans-edge-sharing PN 5 (Figure 2).…”

High-Pressure Synthesis ofγ-P3N5 at 11 GPa and 1500 °C in a Multianvil Assembly: A Binary Phosphorus(V) Nitride with a Three-Dimensional Network Structure from PN4 Tetrahedra and Tetragonal PN5 Pyramids

“…In accordance with the pressure–coordination rule7 a partial increase of the coordination number of the phosphorus atoms from four in α ‐P 3 N 5 to five in γ ‐P 3 N 5 is observed. The bond lengths P−N in the PN 5 pyramids (166(1), 171(1), and 177(1) pm) are significantly longer than in the PN 4 tetrahedra (159(1) and 170(1) pm) (Figures 4 and 5), which corresponds to the pressure–distance paradox 8. A quite similar observation is made in the spinel structure of cubic γ ‐Si 3 N 4 , in which the coordination numbers of silicon are partially increased from four to six compared to those in α ‐ and β ‐Si 3 N 4 , which are the stable phases at normal pressure 3…”

Multianvil-Synthese, Pulver-Röntgenstrukturanalyse, 31P-MAS-NMR- und FTIR-Spektroskopie sowie Materialeigenschaften von γ-P3N5, einer Hochdruckphase von binärem Phosphor(V)-nitrid mit verzerrt quadratischen PN5-Pyramiden und PN4-TetraedernProfessor Welf Bronger zum 70. Geburtstag gewidmet

“…verknüpfter PN 4 -Tetraeder verknüpfen jeweils spiegelsymmetrische Schichten aus PN 5 -Einheiten (Abb. Gemäß dem Druck-Abstands-Paradoxon [20] sind in γ-P 3 N 5 die Bindungslängen in den PN 5 In γ-P 3 N 5 streuen die Bindungslängen (Tab. In Übereinstimmung mit der Druck-Koordinationsregel [19] wird in der Hochdruckphase γ-P 3 N 5 im Vergleich zu α-P 3 N 5 bei zwei Dritteln der P-Atome eine Erhöhung der Koordinationszahl von vier auf fünf beobachtet.…”