Experimental Studies of Hugoniot for Powder Mixture of BaCO3 and TiO2 and Shock Wave Synthesis of BaTiO3
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摘要: 利用高能炸药爆轰驱动冲击波、狭缝扫描闪光隙高速照相技术和阻抗匹配解原理，在10~100 GPa压力范围内，测量了BaCO3和TiO2粉末混合物的冲击绝热数据。同时，利用轴对称柱面和平面爆轰装置，进行了该混合物样品的冲击后回收实验和回收样品的X射线衍射分析，考察BaTiO3的冲击合成。测量出的冲击绝热数据，以冲击波压力和比容平面上的结果为例，在约30和45 GPa两个压力值时，比容发生明显跃变。冲击绝热数据与回收样品X射线衍射分析结果相结合，判断出，这两个跃变分别对应于TiO2从锐钛矿相转变到高压-TiO2相，BaCO3与TiO2开始急剧化学反应合成出BaTiO3并放出CO2。此外，在压力为10 GPa左右作回收实验，其回收样品的X射线衍射分析表明TiO2由锐钛矿相完全转变为金红石相。Abstract: Hugoniot data for powder mixture of BaCO3 and TiO2 have been measured in the range 10 to 100 GPa according to impedance match principle using chemical explosive driven shock wave and flash gap slit sweeping photography of high speed rotating mirror camera. Recovery experiments with axial symmetric and planar configurations and X-ray diffraction of recovered sample in order to examine shock synthesis of BaTiO3 have conducted as well. Measured Hugoniot curves show obvious discontinuities at about 30 and 45 GPa. Hugoniot data combined with X-ray diffraction analyses show that those discontinuities correspond to the phase transition of TiO2 in the mentioned mixture from the anatase to the -TiO2 phase and synthesized BaTiO3 reaction between BaCO3 and TiO2, respectively. Moreover, X-ray diffraction analyses of recovered samples using ammonium nitrate charge indicate that the very complete transition of TiO2 from the anatase phase to the rutile phase occurred.
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Key words:
- shock synthesis /
- shock Hugoniot
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