Results 221 to 230 of about 10,533 (264)
Some of the next articles are maybe not open access.
Structure–property relations in doped perovskite oxides
International Journal of Inorganic Materials, 2001Abstract A review of experimental work on A cation size effects in perovskites such as AMnO 3 CMR materials, A 2 CuO 4 and ABa 2 Cu 3 O 7− x superconductors and ATiO 3 ferroelectrics is presented. These show that the mean A cation radius and cation size variance are both important parameters that control properties.
openaire +1 more source
Journal of Solid State Chemistry, 1995
A new strontium manganese oxycarbonate Sr{sub 5}Mn{sub 4}CO{sub 3}O{sub 10}, related to the perovskite structure, was synthesised, using a solid state reaction. the mean structure of this compound was solved by X-ray diffraction and electron microscopy in the P4/m space group.
V. Caignaert, B. Domengès, B. Raveau
openaire +1 more source
A new strontium manganese oxycarbonate Sr{sub 5}Mn{sub 4}CO{sub 3}O{sub 10}, related to the perovskite structure, was synthesised, using a solid state reaction. the mean structure of this compound was solved by X-ray diffraction and electron microscopy in the P4/m space group.
V. Caignaert, B. Domengès, B. Raveau
openaire +1 more source
Defect structure and electrical conductivity of niobates with related perovskite-type structures
Solid State Ionics, 1984Abstract The electrical conductivity in terms of T and PO2 of alkaline earth niobates is strongly related to the degree of long-range ordeer of the different ions in the B sites of the perovskite structure: A(B′ 1 3 Nb 2 3 )O 3 and passes through a minimum at intermediate PO2.
J LECOMTE +4 more
openaire +1 more source
The Structural and Magnetic Characterisation of Perovskite-Related Oxyfluoride Materials
2023This thesis explores two n=1 Aurivillius oxyfluoride phases and their structural characterisation and how this relates to their physical properties. Bi2CoO2F4 was successfully analysed using XRPD, NPD, XANES and SHG techniques. Structural characterisation of NPD data collected at 50 K and at 5 K indicated rotations of CoF6 octahedra about both in-plane
openaire +1 more source
Advances in the synthesis and structural description of 2H-hexagonal perovskite-related oxides
Current Opinion in Solid State and Materials Science, 2001AbstractFor Abstract see ChemInform Abstract in Full Text.
K. E. Stitzer +2 more
openaire +1 more source
Localized to Itinerant Electronic Transitions in Perovskite-Related Structures
1999Experiments on several perovskite-related transition-metal oxides at the cross-over from localized to itinerant electronic behavior reveal strong electron coupling not only to static, but also to dynamic oxygen displacements. A discontinuous change in the mean kinetic energy of the electrons results in a first-order transition at the cross-over and a ...
J. B. Goodenough, J.-S. Zhou
openaire +1 more source
Journal of Solid State Chemistry, 2012
Abstract NaNiF3 perovskite was found to transform to post-perovskite at 16–18 GPa and 1273–1473 K. The equilibrium transition boundary is expressed as P (GPa)=−2.0+0.014×T (K). Structure refinements indicated that NaNiF3 perovskite and post-perovskite have almost regular NiF6 octahedra consistent with absence of the first-order Jahn–Teller active ...
Y. Shirako +7 more
openaire +1 more source
Abstract NaNiF3 perovskite was found to transform to post-perovskite at 16–18 GPa and 1273–1473 K. The equilibrium transition boundary is expressed as P (GPa)=−2.0+0.014×T (K). Structure refinements indicated that NaNiF3 perovskite and post-perovskite have almost regular NiF6 octahedra consistent with absence of the first-order Jahn–Teller active ...
Y. Shirako +7 more
openaire +1 more source
Journal of Solid State Chemistry, 2005
Abstract Well-developed single crystals of the title compound were prepared using a BaCl2 flux and investigated by X-ray diffraction methods using Mo(Kα) radiation and a Charge Coupled Device (CCD) detector. The crystal structure was solved and refined in the hexagonal symmetry with P 6 ¯ m 2 space group, a=5.6698(2) A and c=14.4654(
Tancret, Nathalie +2 more
openaire +2 more sources
Abstract Well-developed single crystals of the title compound were prepared using a BaCl2 flux and investigated by X-ray diffraction methods using Mo(Kα) radiation and a Charge Coupled Device (CCD) detector. The crystal structure was solved and refined in the hexagonal symmetry with P 6 ¯ m 2 space group, a=5.6698(2) A and c=14.4654(
Tancret, Nathalie +2 more
openaire +2 more sources
Oxygen Vacancies in Perovskite and Related Structures: Implications for the Lower Mantle
MRS Proceedings, 2002AbstractThe oxygen vacancy ordering process and displacive transitions have been characterised in the system CaTiO3-CaFeO2.5 as a function of composition and temperature at atmospheric pressure using X-ray diffraction, Mössbauer spectroscopy, infrared spectroscopy, transmission electron microscopy, electron energy loss spectroscopy, neutron diffraction
Catherine A. McCammon +8 more
openaire +1 more source
Ba2U2O7 : A canted ferromagnet with double-perovskite related orthorhombic structure
Physica B: Condensed Matter, 2006Abstract Ba2U2O7 with double-perovskite related orthorhombic structure has been prepared by reducing BaUO4 in H2 (He) atmosphere. The magnetic susceptibility (χ) measurement has revealed that this system undergoes successive magnetic transitions, first at TN′=60 K and then at TN=19 K. The 1/χ vs.
Akio Nakamura, Yoshii Kenji
openaire +1 more source