High (pressure, temperature) phase diagrams of ZnO and AlN from second harmonic generation measurements

The pressure-induced B4 → B1 structural phase boundaries of ZnO and AlN have been determined with the second harmonic generation (SHG) technique at high temperature. The SHG measurements of AlN show that between 15.6 and 18GPa, the phase boundary has a negative slope of nearly −627K/GPa, and that be...

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Bibliographic Details
Published in:Applied physics letters 2012-01, Vol.100 (2), p.021909-021909-3
Main Authors: Bayarjargal, Lkhamsuren, Winkler, Björn
Format: Article
Language:English
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Summary:The pressure-induced B4 → B1 structural phase boundaries of ZnO and AlN have been determined with the second harmonic generation (SHG) technique at high temperature. The SHG measurements of AlN show that between 15.6 and 18GPa, the phase boundary has a negative slope of nearly −627K/GPa, and that below 15.6GPa, the slope is significantly smaller (−77K/GPa). ZnO has a phase boundary with a negative slope of nearly −1427K/GPa around 5.3-6GPa and −228K/GPa below 5GPa. The phase transition pressure of AlN is sensitive to deviatoric stress and varies from 18 to 24.5GPa.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3676057