Crystal growth of berlinite, AlPO4: Physical characterization and comparison with quartz

Structural Phase Transformations in Crystalline Gallium Orthophosphate

“…This can provide energy for the endothermic transformation into the hC form. Similar arguments have been applied for the formation of dislocations in water-containing berlinite crystals (19). Thus, besides the e!ects of grain size and heating rate, the di!erent water content of the samples can also be responsible for the rather wide range in which the lQPhC transformation temperature has been found by ourselves and other authors.…”

Characterizations of piezoelectric GaPO4 single crystals grown by the flux method

“…Our laboratory has been interested in the single-crystal growth of piezoelectric materials with the a-quartz structures such as a-AlPO 4 and a-GaPO 4 since the early 80s [1,2]. Since the low-quartz structure of GaPO 4 presents an electromechanical coupling coefficient (k=16%) better than that of a-AlPO 4 (k=11%) and a-SiO 2 (k=8%), much attention has been reported on the gallium-orthophosphate material.…”

Phase separation and crystallization in the system SiO2–Al2O3–P2O5–B2O3–Na2O glasses

“…It is well known that AlPO 4 crystal readily precipitates from glasses containing relatively large amount of Al 2 O 3 and P 2 O 5 [12,13]. AlPO 4 crystal has all the three normal silica structures and has a bulk and surface acoustic wave function similar to a-quartz [14][15][16][17].…”