The coordination of Mg in spinel, diopside and pyrope is 4,6 and 8,respectively. The spectral profiles of these minerals are different, and the Mg K edge shifts towards higher energy with increase in the coordination ...The coordination of Mg in spinel, diopside and pyrope is 4,6 and 8,respectively. The spectral profiles of these minerals are different, and the Mg K edge shifts towards higher energy with increase in the coordination number of Mg. The former may be related to the coordination geometry, and the latter to the Mg—O band distance. Mg K edge(peak 1) tends to shift to higher energy with the increase in Mg-O band distance, but also to shift to lower energy with increase in the band valence of Mg with oxygen. Mg in CaMgSi 2O 6(Di) NaAlSi 3O 8(Ab)glasses may be multiple structural sites.展开更多
Through the study of inclusion in synthetic diamond by electron microprgbe and X ray powder diffraction,we found that Melnikovite is one of the important inclusions in synthetic diamond.Research results show that synt...Through the study of inclusion in synthetic diamond by electron microprgbe and X ray powder diffraction,we found that Melnikovite is one of the important inclusions in synthetic diamond.Research results show that synthetic diamond is growing at the specific oxidation reduction environment ,where Fe 2+ and Fe 3+ exist at the same time.展开更多
Grandidierite has unit cell dimension a =1.097?8, b =1.033?5, c =0.576?0?nm,space group Pbum ,and chemical equation to MgAl 2Al[SiO 4][BO 3]O 2, d values of three strongest diffraction peaks are 5.482(9)、5.17(10)、5....Grandidierite has unit cell dimension a =1.097?8, b =1.033?5, c =0.576?0?nm,space group Pbum ,and chemical equation to MgAl 2Al[SiO 4][BO 3]O 2, d values of three strongest diffraction peaks are 5.482(9)、5.17(10)、5.04(10).Grandidierite occurs four peaks of infrared absorption spectra:943,688,568,407?cm 1 .Coordination of Mg is five in grandidierite by X ray absorption near edge spectra(XANES).展开更多
The pearl layer is one of the important materials. People make the good use of it in the respect of medicine and industrial chemicals. Making the composition clear is the necessary premise;meanwhile shells are the ver...The pearl layer is one of the important materials. People make the good use of it in the respect of medicine and industrial chemicals. Making the composition clear is the necessary premise;meanwhile shells are the very good natural model of organic inorganic compound material.展开更多
Is there the inner circle layer of carbon in the Earth?Does the outer circle layer of carbon come from the inner circle layer of carbon?Can the microstructures of carbon derived from organism trace vestiges of life?Ar...Is there the inner circle layer of carbon in the Earth?Does the outer circle layer of carbon come from the inner circle layer of carbon?Can the microstructures of carbon derived from organism trace vestiges of life?Are carbon materials"all embracing material"?and how to enhance qualities of diamond?展开更多
In this paper authors study all sorts of fancy diamond,and then analyze what caused color change in fancy diamond.Moreover,authors try to discusses its mechanism of coloration and character of fancy diamond.
In this paper,the authors discussed the principle of and the way to enhancing the color of the pearl. Since neither natural nor the cultured pearl′s color can meet the people′s demands, they need treating and enhanc...In this paper,the authors discussed the principle of and the way to enhancing the color of the pearl. Since neither natural nor the cultured pearl′s color can meet the people′s demands, they need treating and enhancing. After being bleaching, dying and radiation, the pearl′s color will be most satisfactory.展开更多
文摘The coordination of Mg in spinel, diopside and pyrope is 4,6 and 8,respectively. The spectral profiles of these minerals are different, and the Mg K edge shifts towards higher energy with increase in the coordination number of Mg. The former may be related to the coordination geometry, and the latter to the Mg—O band distance. Mg K edge(peak 1) tends to shift to higher energy with the increase in Mg-O band distance, but also to shift to lower energy with increase in the band valence of Mg with oxygen. Mg in CaMgSi 2O 6(Di) NaAlSi 3O 8(Ab)glasses may be multiple structural sites.
文摘Through the study of inclusion in synthetic diamond by electron microprgbe and X ray powder diffraction,we found that Melnikovite is one of the important inclusions in synthetic diamond.Research results show that synthetic diamond is growing at the specific oxidation reduction environment ,where Fe 2+ and Fe 3+ exist at the same time.
文摘Grandidierite has unit cell dimension a =1.097?8, b =1.033?5, c =0.576?0?nm,space group Pbum ,and chemical equation to MgAl 2Al[SiO 4][BO 3]O 2, d values of three strongest diffraction peaks are 5.482(9)、5.17(10)、5.04(10).Grandidierite occurs four peaks of infrared absorption spectra:943,688,568,407?cm 1 .Coordination of Mg is five in grandidierite by X ray absorption near edge spectra(XANES).
文摘The pearl layer is one of the important materials. People make the good use of it in the respect of medicine and industrial chemicals. Making the composition clear is the necessary premise;meanwhile shells are the very good natural model of organic inorganic compound material.
文摘Is there the inner circle layer of carbon in the Earth?Does the outer circle layer of carbon come from the inner circle layer of carbon?Can the microstructures of carbon derived from organism trace vestiges of life?Are carbon materials"all embracing material"?and how to enhance qualities of diamond?
文摘In this paper authors study all sorts of fancy diamond,and then analyze what caused color change in fancy diamond.Moreover,authors try to discusses its mechanism of coloration and character of fancy diamond.
文摘In this paper,the authors discussed the principle of and the way to enhancing the color of the pearl. Since neither natural nor the cultured pearl′s color can meet the people′s demands, they need treating and enhancing. After being bleaching, dying and radiation, the pearl′s color will be most satisfactory.
