title: Structure Peculiarities of Micro- and Nanocrystalline Perovskite Ferrites La1-xSmxFeO3.
abstract: Micro- and nanocrystalline lanthanum-samarium ferrites La1-xSmxFeO3with orthorhombic perovskite structure were obtained by using both solid state reactions (x = 0.2, 0.4, 0.6 and 0.8) and sol-gel synthesis (x = 0.5) techniques. Obtained structural parameters of both series of La1-xSmxFeO3are in excellent agreement with the "pure" LaFeO3and SmFeO3compounds, thus proving formation of continuous solid solution in the LaFeO3-SmFeO3system. Peculiarity of La1-xSmxFeO3solid solution is divergence behaviour of unit cell dimensions with increasing x: systematic decrease of the a and c lattice parameters is accompanied with increasing b parameter. Such behaviour of the unit cell dimensions in La1-xSmxFeO3series led to crossover of the a and c perovskite lattice parameters and formation of dimensionally tetragonal structure near x = 0.04. Linear decrease of the unit cell volume of La1-xSmxFeO3with decreasing x according with the Vegard's rule indicate absence of short-range ordering of R-cations in the LaFeO3-SmFeO3system.
authors.affiliation: Semiconductor Electronics Department of Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.
authors.forename: O B
authors.initials: OB
authors.lastname: Pavlovska
authors.affiliation: Semiconductor Electronics Department of Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine. crystal-lov@polynet.lviv.ua.
authors.forename: L O
authors.initials: LO
authors.lastname: Vasylechko
authors.affiliation: Department of Chemical Technology of Silicates of Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.
authors.forename: I V
authors.initials: IV
authors.lastname: Lutsyuk
authors.affiliation: Department of Ecological Safety and Nature Protection Activity of Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.
authors.forename: N M
authors.initials: NM
authors.lastname: Koval
authors.affiliation: Semiconductor Electronics Department of Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.|Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland.
authors.forename: Ya A
authors.initials: YA
authors.lastname: Zhydachevskii
authors.affiliation: Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Pieniążek
keywords: Crystal structure; Lattice crossover; Mixed rare earth ferrites; Perovskites; Solid solution