https://doi.org/10.1007/s100510050181
On the high-pressure phase transition in GaPO 4
1
Laboratoire de Sciences de la Terre (CNRS UMR 5570) ,
École normale supérieure de Lyon,
46 allée d'Italie, 69364 Lyon Cedex 07, France
2
Physique des Milieux Condensés (CNRS URA 782) ,
Université Pierre et Marie Curie, B77,
4 place Jussieu, 75252 Paris Cedex 05, France
Corresponding author: a james.badro@ens-lyon.fr
Received:
7
October
1997
Revised:
17
November
1997
Accepted:
18
November
1997
Published online: 15 February 1998
X-ray diffraction (XRD) experiments have been carried out on
quartz-like 
GaPO4 at high pressure and room temperature. A
transition to a high pressure disordered crystalline form occurs at
13.5 GPa. Slight heating using a YAG infrared laser was applied at
17 GPa in order to crystallize the phase in its stability field. The
structure of this phase is orthorhombic with space group Cmcm. The cell
parameters at the pressure of transition are a=7.306 Å,
b=5.887 Å and c=5.124 Å.
PACS: 62.50.+p – High-pressure and shock-wave effects in solids and liquids / 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 61.10.-i – X-ray diffraction and scattering
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
