title: Thermal expansion of layered cobaltites Y(Ba₁ - xSrx)Co₂O₅ + δ with x = 0, 0.05 and 0.10.
abstract: The crystal structure and thermal expansion of Sr-doped layered cobaltites Y(Ba(1 - x)Sr(x))Co(2)O(5 + δ) (x = 0, 0.05 and 0.10) were studied by means of in situ neutron thermodiffraction in the temperature range 20 K ≤ T ≤ 570 K. The evolution with temperature of lattice parameters for the phases which crystallize in this system is presented, as well as their dependence on the oxygen non-stoichiometry δ. Each phase's volume has been fitted using available models based on the Grüneisen approximation to the zero-pressure equation of state and using the Ruffa model based on the Morse potential, both using a Debye model for the internal energy. The coefficient of volumetric thermal expansion, Debye temperature and other thermodynamic parameters are presented and compared with other perovskite compounds.
authors.affiliation: Consejo Nacional de Investigaciones Científicas y Técnicas, Centro Atómico Bariloche-Comisión Nacional de Energía Atómica, Av. Bustillo 9500, 8400 S. C. de Bariloche, RN, Argentina. gaurelio@cab.cnea.gov.ar
authors.forename: G
authors.initials: G
authors.lastname: Aurelio
authors.forename: S
authors.initials: S
authors.lastname: Bustingorry
authors.forename: R D
authors.initials: RD
authors.lastname: Sánchez
authors.forename: G J
authors.initials: GJ
authors.lastname: Cuello