High Pressure Study Of Lead Sulfate

Pressure is independent of temperature and chemical composition,it is the third physics parameters, it may cause material the interatomic distance reduction and the neighboring electron's track overlap increases very effectively , and change material crystal structure, electronic structure and intermolecular interaction to meet high-pressure equilibrium. Composing forms the brand-new state of matter. These materials have are at variance with the atmospheric pressure material the structure and the novel physics, the chemical property. The high pressure may provide in excess of several times new material for us, in order to seek for the special use the new material to provide the rich origin. The high-pressured science of will be the key that the humanity knows gate of the nature, the opening universe. High-pressured science's any breakthrough will cause the human knowledge the innovation.With the development of high pressure physics and techniques', high pressure physics is applied in various fields. It can provide the basis theories on the component,evaluative rules of the earth,the planet and whole Mineral have special Raman spectroscopy characters in high temperature an celestial bodies, providing the characteristic and structure basis data about some spaceflight and nuclear blast materials under high pressure. Moreover it can help to understand the some models in normal condition by studying the materials high pressure energy spectrum and physical properties. It has the bright future on biology \chemistry\material science. So high pressure physics is very important in many fields and does a very important role.Mineral have special Raman spectroscopy characters in high temperature and in pressure, research it's pectroscopy characters is very important to know the physics and chemistry characters of the mineral in the deep earth.Raman spectroscopy in high pressure in the most way to research the character of muster. The bond within the sulfate is covalent bond, which has strong Raman flex-shake spectrum.In this paper, we research the Raman spectrum of lead sulfate in high pressure. The main conclusion as follows:The first, at room temperature, atmospheric pressure from the pressure to 28.1GPa, we observe the lead sulfate each Raman peak's displacement increases along with the pressure increases to the high frequency direction linearity. When the pressure achieves 5GPa, the Raman peak of lead sulfate obvious change in the 614.71 cm-1, and cleavages becomes 613 cm-1 and 621 cm-1. When the pressure achieves 8.6GPa, the Raman peak of lead sulfate cleavages becomes1071 cm-1 and1091 cm-1 in the1180 c cm-1. When the pressure achieves 24.45GPa, the Raman peak of lead sulfate cleavages becomes1054 cm-1 and1068 cm-1 in the1060 cm-1. Whether the lead sulfate did start to have the structure changes in 5GPa? The change of the lead sulfate Laman peak occurred in 8.6GPa and 24.45GPa is a identical change or a newly changes? We can not determine from the high-pressured Raman empirical datum, need to make the high-pressured X-ray diffraction to carry on further confirm.The second, the experiment also discovered that the intensity of all lead sulfate of Raman peak is being weakened with pressure increase. But they restore to the original state when we slow release of pressure to atmospheric pressure. Therefore we may judge this changes are reversible.