The solid state solutions of europium transition element oxides Eu (Fe0.8M0.2)O3 (M=Sc, Cr, Mn, Co) are synthesized. The X-ray diffraction of the compound shows that all the compounds possess the perovskite structures...The solid state solutions of europium transition element oxides Eu (Fe0.8M0.2)O3 (M=Sc, Cr, Mn, Co) are synthesized. The X-ray diffraction of the compound shows that all the compounds possess the perovskite structures. Both the 151Eu Mossbauer spectra and the Fe Mossbauer spectra are measured. The hyperfine magnetic field and non-axisymmetric electric field gradient are observed in the Eu Mossbauer spectrum. The 57Fe Mossbauer spectrum shows that there are four components of hyperfine fields corresponding to four kinds of different neighbours of the Fe ion.展开更多
A method of fitting to Mossbauer spectrum of 151Eu has been proposed. The intensities and the positions of all the possible transitions between the sublevels of the ground state and those of the excited state of nucle...A method of fitting to Mossbauer spectrum of 151Eu has been proposed. The intensities and the positions of all the possible transitions between the sublevels of the ground state and those of the excited state of nucleus with spin I> 3/2 can be considered at one time in fitting to experimental Mossbauer spectra by this method. The method has been used to fit to the experimental Mossbauer spectra of europium orthophosphate crystal and of europium pentaphosphate crystal, and to derive Mossbauer parameters from the experimental spectra. The method and the results have been discussed.展开更多
Thermally activated electron delocalization and the next nearest neighbor effect are the most interesting and active areas of research in mineral chemistry.The minerals having electron delocalization frequently show u...Thermally activated electron delocalization and the next nearest neighbor effect are the most interesting and active areas of research in mineral chemistry.The minerals having electron delocalization frequently show unusual optical and other physical properties. Electron delocalization has been observed in the M?ssbauer spectra of hematite-ilmenite solution,ilvaite, deerite and Fe-Ti garnet. The next nearest neighbor effect in minerals is the line splitting phenomenon caused by the ions in second coordination sphere. Calcic pyroxene and omphacite are the classic examples for such an effect. Recently, the M?ssbauer spectra of purpurite and chromite were explained using this effect.展开更多
Ⅰ. INTRODUCTION In recent years several double rare-earth oxide solid solutions have been synthesized and their physical properties have been determined. These studies are important for developing the rare-earth soli...Ⅰ. INTRODUCTION In recent years several double rare-earth oxide solid solutions have been synthesized and their physical properties have been determined. These studies are important for developing the rare-earth solid state physics science.展开更多
文摘The solid state solutions of europium transition element oxides Eu (Fe0.8M0.2)O3 (M=Sc, Cr, Mn, Co) are synthesized. The X-ray diffraction of the compound shows that all the compounds possess the perovskite structures. Both the 151Eu Mossbauer spectra and the Fe Mossbauer spectra are measured. The hyperfine magnetic field and non-axisymmetric electric field gradient are observed in the Eu Mossbauer spectrum. The 57Fe Mossbauer spectrum shows that there are four components of hyperfine fields corresponding to four kinds of different neighbours of the Fe ion.
基金Project supported by the National Natural Science Foundation of China
文摘A method of fitting to Mossbauer spectrum of 151Eu has been proposed. The intensities and the positions of all the possible transitions between the sublevels of the ground state and those of the excited state of nucleus with spin I> 3/2 can be considered at one time in fitting to experimental Mossbauer spectra by this method. The method has been used to fit to the experimental Mossbauer spectra of europium orthophosphate crystal and of europium pentaphosphate crystal, and to derive Mossbauer parameters from the experimental spectra. The method and the results have been discussed.
文摘Thermally activated electron delocalization and the next nearest neighbor effect are the most interesting and active areas of research in mineral chemistry.The minerals having electron delocalization frequently show unusual optical and other physical properties. Electron delocalization has been observed in the M?ssbauer spectra of hematite-ilmenite solution,ilvaite, deerite and Fe-Ti garnet. The next nearest neighbor effect in minerals is the line splitting phenomenon caused by the ions in second coordination sphere. Calcic pyroxene and omphacite are the classic examples for such an effect. Recently, the M?ssbauer spectra of purpurite and chromite were explained using this effect.
基金Project supported by the National Natural Science Foundation of China
文摘Ⅰ. INTRODUCTION In recent years several double rare-earth oxide solid solutions have been synthesized and their physical properties have been determined. These studies are important for developing the rare-earth solid state physics science.
