Science. 1967 Mar 17;155(3768):1401-4. doi: 10.1126/science.155.3768.1401.
The Hugoniot of the rutile phase of titanium dioxide has been determined to 1.25 megabars, and data show the existence of a phase change at about 0.33 megabar. The volume decrease associated with this transformation appears to be quite large (approximately 21 percent). Rutile, when recovered from shockloading in excess of the transformation pressure, is found to be irreversibly transformed to the orthorhombic lead dioxide structure (a distortion of the fluorite structure) with parameters a, 4.529; b, 5.464; and c, 4.905 angstroms and a calculated density of 4.374 grams per cubic centimeter. The new phase reverts to rutile at temperatures above 450 degrees C. It is suggested that the new phase may be another diagnostic indicator of meteorite impact on the earth's surface.
金红石相二氧化钛的冲击波数据已确定为 1.25 兆巴，数据表明在约 0.33 兆巴处存在相变。与这种转变相关的体积减小似乎相当大（约 21%）。当从超过相变压力的冲击加载中回收金红石时，发现它不可逆地转变为四方铅二氧化物结构（萤石结构的扭曲），参数 a 为 4.529；b 为 5.464；c 为 4.905 埃，计算密度为 4.374 克/立方厘米。新相在 450°C 以上的温度下回复为金红石。有人认为，这种新相可能是陨石撞击地球表面的另一个诊断指标。
