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
synthesisCeramic samples of BiFeO_(3)-based perovskite solid solutions with the highly ordered complex perovskites PbFe_(1/2)Sb_(1/2)O_(3)(PFS)and SrFe_(1/2)Sb_(1/2)O_(3)(SFS)were obtained using high-pressure synthesi...synthesisCeramic samples of BiFeO_(3)-based perovskite solid solutions with the highly ordered complex perovskites PbFe_(1/2)Sb_(1/2)O_(3)(PFS)and SrFe_(1/2)Sb_(1/2)O_(3)(SFS)were obtained using high-pressure synthesis at 4-6 GPa.Mössbauer studies revealed that BiFeO_(3)-SFS compositions are characterized by a larger compositional inhomogeneity as compared to BiFeO_(3)-PFS ones.In line with this result,concentration dependence of the magnetic phase transition temperature TN for BiFeO_(3)-SFS compositions is close to the TN(x)dependence for BiFeO_(3)solid solution with disordered perovskite PbFe_(1/2)Nb_(1/2)O_(3)(PFN).In contrast to this TN(x)dependence for BiFeO_(3)-PFS compositions nicely follows the theoretical TN(x)dependence calculated for the case of the ordered distribution of Fe3+and non-magnetic Sb^(5)+ions in the lattice(chemical ordering).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The reported study was funded by RFBR(Project number 20-52-00045)BRFBR(Project number T20R-169).
文摘synthesisCeramic samples of BiFeO_(3)-based perovskite solid solutions with the highly ordered complex perovskites PbFe_(1/2)Sb_(1/2)O_(3)(PFS)and SrFe_(1/2)Sb_(1/2)O_(3)(SFS)were obtained using high-pressure synthesis at 4-6 GPa.Mössbauer studies revealed that BiFeO_(3)-SFS compositions are characterized by a larger compositional inhomogeneity as compared to BiFeO_(3)-PFS ones.In line with this result,concentration dependence of the magnetic phase transition temperature TN for BiFeO_(3)-SFS compositions is close to the TN(x)dependence for BiFeO_(3)solid solution with disordered perovskite PbFe_(1/2)Nb_(1/2)O_(3)(PFN).In contrast to this TN(x)dependence for BiFeO_(3)-PFS compositions nicely follows the theoretical TN(x)dependence calculated for the case of the ordered distribution of Fe3+and non-magnetic Sb^(5)+ions in the lattice(chemical ordering).
