High Pressure Study Of Strontium Sulfate And Barium Sulfate By Raman Spectroscopy

Pressure, temperature, composition are three parameter for substance. The change of temperature and composition is the usual method to study the characters and improve the performance. We can obtain new material, which cannot be prepared atmosphere by study the state of sample at high pressure. The essential effect of pressure is to reduce interatomic distance, which leads to modification in lattice constants of crystalline material as well as to change in atomic positions within crystallographic cells. In general reductions of lattice spacing and force constants between atoms induce modifications in the band structures of solids and thus in electronic properties and optical properties.Thus the physical and chemical characters of substances at high pressure are quite abundant.With the development of high pressure physics and technology, high pressure physics is applied in various fields. It can provide the basis theories on the component, evolutive rules of the earth,the planet and whole Mineral have special Raman spectroscopy characters in high temperature and celestial bodies, providing the characteristics and structure basis data about some spaceflight and nuclear blast materials under high pressure. Moreover it can help to understand the interaction between the molecule and atom, 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 spectroscopy characters is very important to know the physics and chemistry characters of the mineral in the deep earth. Lasting many years Celestite and Barite as the familiar mineral in the earth have got so many attention at large. Compared the normal, the study of the two rocks is lack in high pressure, and most stop in not too high pressure.Raman spectroscopy in high pressure is the most way to research the character of muster. The bond within the sulfate is covalent bond, which has strongRaman flex-shake spectrum. In this paper, we research the Raman spectrum of strontium sulfate and barium sulfate in high pressure, the mostly work is to study their spectrum .The main conclusion as follows:The first, by Raman spectrum studying strontium sulfate in high pressure. Knowing the spectrum move to high peak value, we receive the connection between pressure and peak value by Oringe. In 2.2GPa it appear a new peak at 188cm-1, going with pressure the peak disappear in 23.1GPa. About the new peak, we can't be expected soon and need more study.The second, studying barium sulfate in high pressure by Raman spectrum. find the two peaks combining one in 10.1GPa. This is the same as a paper had reported Before. In the process of adding pressure, the peak value present linearity with pressure. We get connection between the pressure and peak value.The third, we study the Raman spectrum about strontium sulfate and barium sulfate in normal and in high pressure. Discovering that realesed spectrum is similar as the former, that means the two process are reversible.