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Single crystals of Al 1-   x  Ga  x  PO 4  of various mole fractions  x  were grown from phosphoric acid solutions under hydrothermal conditions using the slow-heating method. In order to relate the parameters of this low-quartz structure analogue and the observed phase transitions to the respective mole fraction, the crystals were investigated by means of electron probe microanalysis, X-ray powder diffraction and differential thermal analysis. The results are discussed in terms of the segregation effects occuring during growth. The limiting geometrical parameters for the existence of the high-quartz phase are compared to the values given in the literature.

Polymorph stability and phase transitions of trigonal Al 1- x Ga x PO 4 mixed crystals