The compound PrNiSn was studied by X ray powder diffraction technique. The crystal structure and the X ray diffraction data for this compound at room temperature were reported. The compound PrNiSn is orthorhombic wi...The compound PrNiSn was studied by X ray powder diffraction technique. The crystal structure and the X ray diffraction data for this compound at room temperature were reported. The compound PrNiSn is orthorhombic with lattice parameters a =0.74569(3) nm, b =0.76851(5) nm, c =0.45676(8) nm, V =0.26176 nm 3, Z =4 and D x=8.076 g·cm -3 , space group Pna2 1(33). The figure of merit F N for the compound is F 30 =54 (0.0093, 60).展开更多
The compound NdFe 0.6 Sb 2 was studied by means of X ray powder diffraction. The X ray powder diffraction data and structural parameters demonstrated that this compound is of the tetragonal structure with space...The compound NdFe 0.6 Sb 2 was studied by means of X ray powder diffraction. The X ray powder diffraction data and structural parameters demonstrated that this compound is of the tetragonal structure with space group P4/nmm, Z =2 and D x=7.615 g·cm -3 . The lattice parameters are a =0.43499 (1) nm and c =0.97083 (4) nm. Refinement was performed with 42 reflections.展开更多
The X-ray powder diffraction data of the compound GdAlSi was studied by means of X-ray diffraction technique and refined by Rietveld method. The compound GdAlSi has tetragonal α-ThSi_2-type structure, space group I4_...The X-ray powder diffraction data of the compound GdAlSi was studied by means of X-ray diffraction technique and refined by Rietveld method. The compound GdAlSi has tetragonal α-ThSi_2-type structure, space group I4_1/amd (No.141), Z=4, the lattice parameters a=041234 (1) nm, c=1.44202(1) nm. The Smith and Snyder figure of merit [5] F_N is F_ 30=2521(36). The R-factors of Rietveld refinement are R_p=0.098 and R_ wp=0.128. The X-ray powder diffraction data are given. The field dependence of the magnetization measured at room temperature and the temperature variation of the inverse magnetic susceptibility of the compound GdAlSi were also presented.展开更多
The crystal structure of new compound Ba 3BPO 7 has been solved by X ray powder diffraction technique. As a new structure type, the positions of barium, boron and phosphate atoms have been determined by single crystal...The crystal structure of new compound Ba 3BPO 7 has been solved by X ray powder diffraction technique. As a new structure type, the positions of barium, boron and phosphate atoms have been determined by single crystal direct method after profile decomposition from Ba 3BPO 7 X ray powder diffraction patterns. The positions of oxygen atoms have been determined by the interpretation of their vibration spectra which indicate that in this crystal the boron and phosphorus atoms form BO 3 and PO 4 polyhedra. The structure has been refined by Rietveld technique based on the above model.展开更多
Aim To prepare and characterize solid dispersions of silymarin with the intention of improving their dissolution properties. Methods The solid dispersions were prepared by the fusion method with polyethylene glycol ...Aim To prepare and characterize solid dispersions of silymarin with the intention of improving their dissolution properties. Methods The solid dispersions were prepared by the fusion method with polyethylene glycol 6000(PEG 6000) as the carrier. Evaluation of the properties of the dispersions was performed using dissolution studies, X ray powder diffraction and Fourier transform infrared (FT IR) spectroscopy. Results The rate of dissolution of silymarin was considerably improved as compared with pure silymarin when formulated in solid dispersions with PEG 6000. The data of the X ray diffraction showed some changes in the parameters of lattice spacing [ d ], peak position and relative intensities. FT IR together with those from X ray diffraction showed the absence of well defined drug polymer interactions. Conclusion The dissolution improvement of poorly soluble silymarin could be illuminated by the changes of the lattice parameters of PEG 6000 and the drug.展开更多
The novel complex of thioglycolic acid and trivalent antimony ion had been synthesized by liquid phase reaction of thioglycolic acid and antimony trichloride.The structure of the complex was characterized by elemental...The novel complex of thioglycolic acid and trivalent antimony ion had been synthesized by liquid phase reaction of thioglycolic acid and antimony trichloride.The structure of the complex was characterized by elemental analyses and X ray powder diffraction.The complex has the composition of HSb(SCH 2COO) 2 being white crystal,stable in air,non hygroscopicity and decomposed above 208℃.The results of indexes to the X ray powder diffraction data indicate that the crystal structure of the complex belongs to monoclinic system.The lattice parameters are:a=1.4015nm,b=1.2092nm,c=1.2419nm,β=126.68°,V=1.6879nm 3,Z=8,D cal =2.384g·cm -3 ,D exp =2.374g·cm -3 .The calculated lattice parameters are in agreement with those of the single crystal determined by us.展开更多
文摘The compound PrNiSn was studied by X ray powder diffraction technique. The crystal structure and the X ray diffraction data for this compound at room temperature were reported. The compound PrNiSn is orthorhombic with lattice parameters a =0.74569(3) nm, b =0.76851(5) nm, c =0.45676(8) nm, V =0.26176 nm 3, Z =4 and D x=8.076 g·cm -3 , space group Pna2 1(33). The figure of merit F N for the compound is F 30 =54 (0.0093, 60).
文摘The compound NdFe 0.6 Sb 2 was studied by means of X ray powder diffraction. The X ray powder diffraction data and structural parameters demonstrated that this compound is of the tetragonal structure with space group P4/nmm, Z =2 and D x=7.615 g·cm -3 . The lattice parameters are a =0.43499 (1) nm and c =0.97083 (4) nm. Refinement was performed with 42 reflections.
文摘The X-ray powder diffraction data of the compound GdAlSi was studied by means of X-ray diffraction technique and refined by Rietveld method. The compound GdAlSi has tetragonal α-ThSi_2-type structure, space group I4_1/amd (No.141), Z=4, the lattice parameters a=041234 (1) nm, c=1.44202(1) nm. The Smith and Snyder figure of merit [5] F_N is F_ 30=2521(36). The R-factors of Rietveld refinement are R_p=0.098 and R_ wp=0.128. The X-ray powder diffraction data are given. The field dependence of the magnetization measured at room temperature and the temperature variation of the inverse magnetic susceptibility of the compound GdAlSi were also presented.
文摘The crystal structure of new compound Ba 3BPO 7 has been solved by X ray powder diffraction technique. As a new structure type, the positions of barium, boron and phosphate atoms have been determined by single crystal direct method after profile decomposition from Ba 3BPO 7 X ray powder diffraction patterns. The positions of oxygen atoms have been determined by the interpretation of their vibration spectra which indicate that in this crystal the boron and phosphorus atoms form BO 3 and PO 4 polyhedra. The structure has been refined by Rietveld technique based on the above model.
文摘Aim To prepare and characterize solid dispersions of silymarin with the intention of improving their dissolution properties. Methods The solid dispersions were prepared by the fusion method with polyethylene glycol 6000(PEG 6000) as the carrier. Evaluation of the properties of the dispersions was performed using dissolution studies, X ray powder diffraction and Fourier transform infrared (FT IR) spectroscopy. Results The rate of dissolution of silymarin was considerably improved as compared with pure silymarin when formulated in solid dispersions with PEG 6000. The data of the X ray diffraction showed some changes in the parameters of lattice spacing [ d ], peak position and relative intensities. FT IR together with those from X ray diffraction showed the absence of well defined drug polymer interactions. Conclusion The dissolution improvement of poorly soluble silymarin could be illuminated by the changes of the lattice parameters of PEG 6000 and the drug.
文摘The novel complex of thioglycolic acid and trivalent antimony ion had been synthesized by liquid phase reaction of thioglycolic acid and antimony trichloride.The structure of the complex was characterized by elemental analyses and X ray powder diffraction.The complex has the composition of HSb(SCH 2COO) 2 being white crystal,stable in air,non hygroscopicity and decomposed above 208℃.The results of indexes to the X ray powder diffraction data indicate that the crystal structure of the complex belongs to monoclinic system.The lattice parameters are:a=1.4015nm,b=1.2092nm,c=1.2419nm,β=126.68°,V=1.6879nm 3,Z=8,D cal =2.384g·cm -3 ,D exp =2.374g·cm -3 .The calculated lattice parameters are in agreement with those of the single crystal determined by us.
