Über eine neue Modifikation von As2O5/On a New Modification of As2O5

Abstract

Abstract High temperature Guinier photographs of As2O5 indicate a continuous phase transition to HT-As2O5, which is accomplished at 305 ± 3 °C. The crystal structure of HT-As2O5 has been derived from the low temperature form; space group and lattice constants are P41212-D4 4 and a = 857.2 pm, c = 463.6pm (310 °C), respectively. According to symmetry considerations, the phase transition is expected to be of pure ferroelastic-paraelastic type (422F 222).