Constructed existence areas of different oxygen-octahedral structures of complex oxides are considered and compared.They are found on numerous facts of certain complex oxide compositions of three different structure t...Constructed existence areas of different oxygen-octahedral structures of complex oxides are considered and compared.They are found on numerous facts of certain complex oxide compositions of three different structure types:successful and not-so-successful syntheses,on the one hand,and their interatomic bond characteristics calculation and analysis-on the other hand.Developed procedures of the crystal structure detailing the theoretical definition for every oxygen-octahedral structure and its constructing existence areas are shown.By using every structure existence area,one may predict the possibility of the specified complex oxides crystallization in the corresponding structure type.展开更多
Some of the known binary ABO_(3)perovskites with ferro-(FE)or antiferroelectric(AFE)at T_(C)and different magnetic phase tran-sitions(PT):ferro-and antiferromagnetic at T_(N)and also some of their solid solutions are ...Some of the known binary ABO_(3)perovskites with ferro-(FE)or antiferroelectric(AFE)at T_(C)and different magnetic phase tran-sitions(PT):ferro-and antiferromagnetic at T_(N)and also some of their solid solutions are considered.Some correlations between their FE or AFE and/or magnetic PTs temperatures,on the one hand,and their interatomic bond A-O strains,on the other hand,have been constructed.It is shown that in the plotted diagrams these temperatures change with a change inδAO values as follows:classical FEs are followed by multiferroics,starting with BiFeO_(3)and ending with YVO_(3),followed by classical AFEs.At the same time,the temperatures T_(C)and T_(N)experience maxima at the corresponding points for BiFeO_(3),then quickly decrease,and the difference between them,T_(C)-T_(N),basically also decreases,slightly increasing along the way to the point EuTiO_(3).which made it possible to systematize these T_(C)and T_(N).展开更多
基金financially supported by the Ministry of Science and Higher Education of the Russian Federation(State assignment in the field of scientific activity,Southern Federal University,2023,Project No.FENW-2023-0015).
文摘Constructed existence areas of different oxygen-octahedral structures of complex oxides are considered and compared.They are found on numerous facts of certain complex oxide compositions of three different structure types:successful and not-so-successful syntheses,on the one hand,and their interatomic bond characteristics calculation and analysis-on the other hand.Developed procedures of the crystal structure detailing the theoretical definition for every oxygen-octahedral structure and its constructing existence areas are shown.By using every structure existence area,one may predict the possibility of the specified complex oxides crystallization in the corresponding structure type.
文摘Some of the known binary ABO_(3)perovskites with ferro-(FE)or antiferroelectric(AFE)at T_(C)and different magnetic phase tran-sitions(PT):ferro-and antiferromagnetic at T_(N)and also some of their solid solutions are considered.Some correlations between their FE or AFE and/or magnetic PTs temperatures,on the one hand,and their interatomic bond A-O strains,on the other hand,have been constructed.It is shown that in the plotted diagrams these temperatures change with a change inδAO values as follows:classical FEs are followed by multiferroics,starting with BiFeO_(3)and ending with YVO_(3),followed by classical AFEs.At the same time,the temperatures T_(C)and T_(N)experience maxima at the corresponding points for BiFeO_(3),then quickly decrease,and the difference between them,T_(C)-T_(N),basically also decreases,slightly increasing along the way to the point EuTiO_(3).which made it possible to systematize these T_(C)and T_(N).
