Properties of Fe-doped semi-insulating (SI) InP with different iron concentrations are studied by using Hall effect,current-voltage ( I-V ),photoluminescence spectroscopy (PL) and photocurrent spectroscopy(PC)measurem...Properties of Fe-doped semi-insulating (SI) InP with different iron concentrations are studied by using Hall effect,current-voltage ( I-V ),photoluminescence spectroscopy (PL) and photocurrent spectroscopy(PC)measurements. I-V characteristics of SI InP strongly depend on Fe doping concentration.Fe doping concentration also influences optical properties and defective formation in as-grown SI InP.Band-gap narrowing phenomenon and defects in Fe doped SI InP are studied using PL and PC.展开更多
Bi（Fe1-xMnx）O3 bulk ceramics with Mn concentration x up to 0.3 were prepared by rapid sintering using sol-gel derived fine powders. Structure transformation is found to depend on the Mn doping concentration by X-ray...Bi（Fe1-xMnx）O3 bulk ceramics with Mn concentration x up to 0.3 were prepared by rapid sintering using sol-gel derived fine powders. Structure transformation is found to depend on the Mn doping concentration by X-ray diffraction and Raman spectroscopy. Bi（Fe1-xMnx）O3 maintains the rhombohedral structure of BiFeO3 with x=0.05 and 0.1, but changes to the orthorhombic structure with x=0.3. Weak ferromagnetism is observed for Bi（Fe1-xMnx）O3 with x=0.05 and 0.1, but stronger paramagnetism is observed for Bi（Fe1-xMnx）O3 with x=0.3 indicating a magnetic phase change from antiferromagnetic to paramagnetic with the structure changing from R3c to C222. Two anomalies at 30 and 140 K are observed for Bi（Fe1-xMnx）O3 with x=0.05 and 0.1. The anomaly at 30 K is concluded to be related to the freezing of cluster spin glass from dc magnetic memory and relaxation measurements.展开更多
文摘Properties of Fe-doped semi-insulating (SI) InP with different iron concentrations are studied by using Hall effect,current-voltage ( I-V ),photoluminescence spectroscopy (PL) and photocurrent spectroscopy(PC)measurements. I-V characteristics of SI InP strongly depend on Fe doping concentration.Fe doping concentration also influences optical properties and defective formation in as-grown SI InP.Band-gap narrowing phenomenon and defects in Fe doped SI InP are studied using PL and PC.
文摘Bi（Fe1-xMnx）O3 bulk ceramics with Mn concentration x up to 0.3 were prepared by rapid sintering using sol-gel derived fine powders. Structure transformation is found to depend on the Mn doping concentration by X-ray diffraction and Raman spectroscopy. Bi（Fe1-xMnx）O3 maintains the rhombohedral structure of BiFeO3 with x=0.05 and 0.1, but changes to the orthorhombic structure with x=0.3. Weak ferromagnetism is observed for Bi（Fe1-xMnx）O3 with x=0.05 and 0.1, but stronger paramagnetism is observed for Bi（Fe1-xMnx）O3 with x=0.3 indicating a magnetic phase change from antiferromagnetic to paramagnetic with the structure changing from R3c to C222. Two anomalies at 30 and 140 K are observed for Bi（Fe1-xMnx）O3 with x=0.05 and 0.1. The anomaly at 30 K is concluded to be related to the freezing of cluster spin glass from dc magnetic memory and relaxation measurements.
