Ceramic samples of(1-x)BiFeO_(3)-xPbFe_(0.5)Sb_(0.5)O_(3)(BFO-xPFS),(1-x)BiFeO_(3)-xSrFe_(0.5) Sb_(0.5)O_(3)(BFO-xSFS)where(x=0.05,0.1,..,0.9),(1-x)BiFeO_(3)-xBaFe_(0.5)Nb_(0.5)O_(3)(BFO-xBFN)and(1-x)BiFeO_(3)-xSrFe_(...Ceramic samples of(1-x)BiFeO_(3)-xPbFe_(0.5)Sb_(0.5)O_(3)(BFO-xPFS),(1-x)BiFeO_(3)-xSrFe_(0.5) Sb_(0.5)O_(3)(BFO-xSFS)where(x=0.05,0.1,..,0.9),(1-x)BiFeO_(3)-xBaFe_(0.5)Nb_(0.5)O_(3)(BFO-xBFN)and(1-x)BiFeO_(3)-xSrFe_(0.5)Nb_(0.5)O_(3)(BFO-xSFN)where(x=0,0.01,0.02,..,0.1,0.2,...,1)solid solutions with a perovskite structure were obtained.Mossbauer studies have shown that the Neel temperature T_(N) concentration dependences of the systems studied are in good agreement with T_(N)(x)calculated under the assumption of the ordered distribution of Fe^(3+)and nonmagnetic Sb^(5+)ions in the lattice.The T_(N) values obtained for BFO-xBFN and BFO-xPFS are close to the values,calculated for cases of the disordered and ordered distribution of Fe^(3+)and nonmagnetic Nb^(5+)and Sb^(5+)ions in the latice,respectively.The T_(N) values of BFO-xSFN and BFO-xSFS are in the range between the calculated values for ordered and disordered cases.Moreover the anomaly on the T_(N)(x)dependence for the BFO-xBFN and BFO-xSFN systems was found near x=0.7.This anomaly is most likely related to the destruction of the magnetic super exchange via the empty 6p state of Bi^(3+)ions.展开更多
Erbium-doped barium titanate(BaTiO_(3):Er)xerogel film with a thickness of about 500 nm was formed on the porous strontium titanate(SrTiO_(3))xerogel film on Si substrate after annealing at 800°C or 900°C.Th...Erbium-doped barium titanate(BaTiO_(3):Er)xerogel film with a thickness of about 500 nm was formed on the porous strontium titanate(SrTiO_(3))xerogel film on Si substrate after annealing at 800°C or 900°C.The elaborated structures show room tempera-ture upconversion luminescence under 980 nm excitation with the photoluminescence(PL)bands at 523,546,658,800 and 830 nm corresponding to^(2)H1_(1/2)→^(4)I_(15/2),^(4)S_(3/2)→^(4)I_(15/2),^(4)F_(9/2)→^(4)I_(15/2)and^(4)I_(9/2)→^(4)I_(15/2)transitions of trivalent erbium.Raman and X-ray diffraction(XRD)analysis of BaTiO_(3):Er\porous SrTiO_(3)\Si structure showed the presence of perovskite phases.Its excellent up-conversion optical performance will greatly broaden its applications in perovskite solar cells and high-end anti-counterfeiting technologies.展开更多
基金supported by the Russian Science Foundation(Grant No.23-42-10024)the Belarusian Republican Foundationfor Fundamental Researches(Grant No.T23RNF-086).
文摘Ceramic samples of(1-x)BiFeO_(3)-xPbFe_(0.5)Sb_(0.5)O_(3)(BFO-xPFS),(1-x)BiFeO_(3)-xSrFe_(0.5) Sb_(0.5)O_(3)(BFO-xSFS)where(x=0.05,0.1,..,0.9),(1-x)BiFeO_(3)-xBaFe_(0.5)Nb_(0.5)O_(3)(BFO-xBFN)and(1-x)BiFeO_(3)-xSrFe_(0.5)Nb_(0.5)O_(3)(BFO-xSFN)where(x=0,0.01,0.02,..,0.1,0.2,...,1)solid solutions with a perovskite structure were obtained.Mossbauer studies have shown that the Neel temperature T_(N) concentration dependences of the systems studied are in good agreement with T_(N)(x)calculated under the assumption of the ordered distribution of Fe^(3+)and nonmagnetic Sb^(5+)ions in the lattice.The T_(N) values obtained for BFO-xBFN and BFO-xPFS are close to the values,calculated for cases of the disordered and ordered distribution of Fe^(3+)and nonmagnetic Nb^(5+)and Sb^(5+)ions in the latice,respectively.The T_(N) values of BFO-xSFN and BFO-xSFS are in the range between the calculated values for ordered and disordered cases.Moreover the anomaly on the T_(N)(x)dependence for the BFO-xBFN and BFO-xSFN systems was found near x=0.7.This anomaly is most likely related to the destruction of the magnetic super exchange via the empty 6p state of Bi^(3+)ions.
基金This research was funded by the grant T19-MLDG of State Committee on Science and Technology of the Republic of Belarus and grant 19.80013.50.07.03A/BL of the Republic of Moldova,grant X20P-388 of the Belarusian Republic Foundation for Fundamental Research and grant 20-52-00039 of the Russian Foundation for Basic Research.
文摘Erbium-doped barium titanate(BaTiO_(3):Er)xerogel film with a thickness of about 500 nm was formed on the porous strontium titanate(SrTiO_(3))xerogel film on Si substrate after annealing at 800°C or 900°C.The elaborated structures show room tempera-ture upconversion luminescence under 980 nm excitation with the photoluminescence(PL)bands at 523,546,658,800 and 830 nm corresponding to^(2)H1_(1/2)→^(4)I_(15/2),^(4)S_(3/2)→^(4)I_(15/2),^(4)F_(9/2)→^(4)I_(15/2)and^(4)I_(9/2)→^(4)I_(15/2)transitions of trivalent erbium.Raman and X-ray diffraction(XRD)analysis of BaTiO_(3):Er\porous SrTiO_(3)\Si structure showed the presence of perovskite phases.Its excellent up-conversion optical performance will greatly broaden its applications in perovskite solar cells and high-end anti-counterfeiting technologies.
