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【求助】高压相变 已有2人参与
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| 想分析高压相变，这个如何在X射线衍射中实现 |
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2楼2010-12-25 17:44:35
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Diamond anvil cell 技术 http://en.wikipedia.org/wiki/Diamond_anvil_cell From Wikipedia, the free encyclopediaJump to: navigation, search Schematics of the core of a diamond anvil cell. The diamond size is a few millimeters at mostA diamond anvil cell (DAC) is a hand-held device used in scientific experiments. It allows compressing a small (sub-millimeter sized) piece of material to extreme pressures, which can exceed 3,000,000 atmospheres (300 gigapascals).[1] The device has been used to recreate the pressure existing deep inside planets, creating materials and phases not observed under normal conditions. Notable examples include the non-molecular ice X[2], polymeric nitrogen[3] and MgSiO3 perovskite, thought to be the major component of the Earth's mantle. A DAC consists of two opposing diamonds with a sample compressed between the culets. Pressure may be monitored using a reference material whose behavior under pressure is known. Common pressure standards include ruby[4] fluorescence, and various structurally simple metals, such as copper or platinum.[5] The uniaxial pressure supplied by the DAC may be transformed into uniform hydrostatic pressure using a pressure transmitting medium, such as argon, xenon, hydrogen, helium, paraffin oil or a mixture of methanol and ethanol[6]. The pressure-transmitting medium is enclosed by a gasket and the two diamond anvils. The sample can be viewed through the diamonds and illuminated by X-rays and visible light. In this way, X-ray diffraction and fluorescence; optical absorption and photoluminescence; Mossbauer, Raman and Brillouin scattering; positron annihilation and other signals can be measured from materials under high pressure. Magnetic and microwave field can be applied externally to the cell allowing nuclear magnetic resonance, electron paramagnetic resonance and other magnetic measurements[7]. Attaching electrodes to the sample allows electrical and magnetoelectrical measurements as well as heating up the sample to a few thousand degrees. Much higher temperatures (up to 7000 K)[8] can be achieved with laser-induced heating [9], and cooling down to millikelvins has been demonstrated [6]. |
3楼2010-12-25 19:40:06