High-Pressure Synthesis of gamma-P(3)N(5) at 11 GPa and 1500 degrees C in a Multianvil Assembly: A Binary Phosphorus(V) Nitride with a Three-Dimensional Network Structure from PN(4) Tetrahedra and Tetragonal PN(5) Pyramids This work was supported by the Fonds der Chemischen Industrie and the Deutsche Forschungsgemeinschaft (Gottfried-Wilhelm-Leibniz-Programm). The authors thank Dr. D. Frost and Prof. Dr. D. C. Rubie, Bayerisches Geoinstitut, Universität Bayreuth, as well as Dr. P. Ulmer, ETH Zürich, for help in adapting the multianvil-technique. Also many thanks to W. Wünschheim, Department Chemie, LMU München for the development and programming of software for the high-pressure experiments.