Abstract
In order to study the stability field of GeO2 under high pressure at room temperature, an in situ observation was made by using a diamond anvil pressure cell, an optical microscope and a high speed VTR. At about 6.5GPa, a transparent single-crystal of α-quartz type GeO2 quickly changed to a translucent material which was found to be X-ray amorphous. The loss of transparency induced by the transformation is attributed to the pulverization due to the large volume change (approximately 10%), which causes the increase of refractive index and introduces the imperfection into the single-crystal.
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