HIGH PRESSURE FORMS OF BPO4 AND BASO4; QUARTZ ANALOGUES
PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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Samples of high pressure forms of BPO4 and BAs04 were prepared and their powder patterns were found to be in agreement with those of products prepared earlier in this laboratory at higher pressures. Small single crystals were obtained of both materials, which, especially in the BPO4, were often perfect hexagonal prisms. The unit cells were determined directly, and were analogous to that of quartz except that the c-axis in each case is doubled. Comparison with c-rotation photographs of quartz showed similar intensity distributions. Powder patterns, refractive index, and density determinations all compared favorably with the earlier research.