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Barz, Ralph-Uwe; David, F.; Schneider, J.; Gille, Peter (2001): Polymorph stability and phase transitions of trigonal Al1-xGaxPO4 mixed crystals. In: Zeitschrift fur Kristallographie, Vol. 216, No. 9: pp. 501-508
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Single crystals of Al1-xGaxPO4 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.