We observed bipolar switching behavior from an epitaxial strontium cobaltite film grown on a
SrTi... more We observed bipolar switching behavior from an epitaxial strontium cobaltite film grown on a SrTiO3 (001) substrate. The crystal structure of strontium cobaltite has been known to undergo topotactic phase transformation between two distinct phases: insulating brownmillerite (SrCoO2.5) and conducting perovskite (SrCoO3d) depending on the oxygen content. The current–voltage characteristics of the strontium cobaltite film showed that it could have a reversible insulator-tometal transition triggered by electrical bias voltage. We propose that the resistance switching in the SrCoOx thin film could be related to the topotactic phase transformation and the peculiar structure of SrCoO2.5
Highly crystalline and porous sesquioxide (Sm2O3, La2O3) doped ceria with different molar ratio i... more Highly crystalline and porous sesquioxide (Sm2O3, La2O3) doped ceria with different molar ratio is successfully synthesized by a simple modified sol–gel route. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) are used to investigate their phase, microstructure and composition. XRD analysis confirmed the formation of highly crystalline cubic fluorite phase in all samples. The Raman spectroscopy revealed a single triple degenerated F2g mode as the attestation of the oxygen vacancy in the doped and undoped samples. Strong photoluminescence lines due to interconfigurational transition and vacancy mediated transition were observed in doped CeO2. The oxygen vacancy induced luminescence of CeO2 was strongly enhanced due to La doping. The effect of rare earth dopant on the photoluminescence properties has been studied in details.
We observed bipolar switching behavior from an epitaxial strontium cobaltite film grown on a
SrTi... more We observed bipolar switching behavior from an epitaxial strontium cobaltite film grown on a SrTiO3 (001) substrate. The crystal structure of strontium cobaltite has been known to undergo topotactic phase transformation between two distinct phases: insulating brownmillerite (SrCoO2.5) and conducting perovskite (SrCoO3d) depending on the oxygen content. The current–voltage characteristics of the strontium cobaltite film showed that it could have a reversible insulator-tometal transition triggered by electrical bias voltage. We propose that the resistance switching in the SrCoOx thin film could be related to the topotactic phase transformation and the peculiar structure of SrCoO2.5
Highly crystalline and porous sesquioxide (Sm2O3, La2O3) doped ceria with different molar ratio i... more Highly crystalline and porous sesquioxide (Sm2O3, La2O3) doped ceria with different molar ratio is successfully synthesized by a simple modified sol–gel route. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) are used to investigate their phase, microstructure and composition. XRD analysis confirmed the formation of highly crystalline cubic fluorite phase in all samples. The Raman spectroscopy revealed a single triple degenerated F2g mode as the attestation of the oxygen vacancy in the doped and undoped samples. Strong photoluminescence lines due to interconfigurational transition and vacancy mediated transition were observed in doped CeO2. The oxygen vacancy induced luminescence of CeO2 was strongly enhanced due to La doping. The effect of rare earth dopant on the photoluminescence properties has been studied in details.
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SrTiO3 (001) substrate. The crystal structure of strontium cobaltite has been known to undergo
topotactic phase transformation between two distinct phases: insulating brownmillerite (SrCoO2.5)
and conducting perovskite (SrCoO3d) depending on the oxygen content. The current–voltage
characteristics of the strontium cobaltite film showed that it could have a reversible insulator-tometal
transition triggered by electrical bias voltage. We propose that the resistance switching in the
SrCoOx thin film could be related to the topotactic phase transformation and the peculiar structure
of SrCoO2.5
SrTiO3 (001) substrate. The crystal structure of strontium cobaltite has been known to undergo
topotactic phase transformation between two distinct phases: insulating brownmillerite (SrCoO2.5)
and conducting perovskite (SrCoO3d) depending on the oxygen content. The current–voltage
characteristics of the strontium cobaltite film showed that it could have a reversible insulator-tometal
transition triggered by electrical bias voltage. We propose that the resistance switching in the
SrCoOx thin film could be related to the topotactic phase transformation and the peculiar structure
of SrCoO2.5