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Title: Chemical reaction at high temperature and high pressure VI : polymorphic transition in ZnP2 at high temperature and high pressure
Authors: Tanaka, Yoshiyuki
Issue Date: 30-Jun-1969
Publisher: The Physico-Chemical Society of Japan
Journal title: The Review of Physical Chemistry of Japan
Volume: 38
Issue: 2
Start page: 151
End page: 169
Abstract: A new pressure-induced modification of zinc-diphosphide, ZnP_2, has been prepared by the direct union of zinc with phosphorus and also through the polymorphic transitions of both monoclinic and tetragonal ZnP_2. The application of pressures above 20kb combined with temperatures above 150℃ is required for the synthesis. The new modification of ZnP_2 has a pseudo-cubic crystal symmetry with a lattice constant a=5.322Å and has a measured density 3.55g/cm^3. It is found to be a semiconducting phase with an energy gap Eg=0.44eV at 15kb in the temperature range from 20° to 150℃. The effects of temperature and pressure on the polymorphic transition of monoclinic and tetragonal ZnP_2 have been investigated and the stability region for the high pressure modification determined by quenching method. The synthesis of a diamond-like form of ZnP_2, which is one of II-V_2type compounds, suggests the possibility of synthesizing other unsymmetrical group IV analogs which was predicted by Hall and Compton earlier.
Appears in Collections:Vol.38 No.2

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