This paper describes a study of the system MoO-NdO using a combination of X-ray powder diffraction (XRD), neutron powder diffraction (NPD), thermogravimetric analysis (TGA), and ac impedance spectroscopy (IS). A phase-pure material is observed at a composition of 45.5 mol % NdO, which corresponds to an ideal stoichiometry of NdMoO.
View Article and Find Full Text PDFThe origin of the 2-order of magnitude difference in the proton conductivity of the hydrated forms of hexagonal and cubic oxygen deficient BaScTiO (x = 0.2 and x = 0.7) was probed using a combination of neutron diffraction and density functional theory techniques to support published X-ray diffraction, conductivity, thermogravimetric and differential scanning calorimetry studies.
View Article and Find Full Text PDFThis work presents a structural investigation of La2-xNdxCe2O7 (x = 0.0, 0.5, 1.
View Article and Find Full Text PDFThe solid-state synthesis and structural characterisation of perovskite BaSn Sc O ( = 0.0, 0.1, 0.
View Article and Find Full Text PDFThis article establishes the effect of structure and composition on water uptake and the hydration and proton transport properties of the oxygen-deficient perovskite series BaTi1-x(In,Sc)xO3-x/2, with 0.2 ≤ x ≤ 0.7.
View Article and Find Full Text PDFBaTi1-xScxO3-δ (x = 0.1-0.8) was prepared via solid state reaction.
View Article and Find Full Text PDFThree different perovskite-related phases were isolated in the SrGa(1-x)Sc(x)O(2.5) system: Sr(2)GaScO(5), Sr(10)Ga(6)Sc(4)O(25), and SrGa(0.75)Sc(0.
View Article and Find Full Text PDFNeutron total scattering data have been used to probe the long- and short-range structure of 0.5BiMnO(3)-0.5ATiO(3) (A = Ba or Sr).
View Article and Find Full Text PDFThe highly disordered structure of the delta phase of Bi2O3, which possesses the highest known oxide-ion conductivity, has been studied using neutron powder diffraction. A detailed analysis of data collected at 1033(3) K using Rietveld refinement indicates that the time-averaged structure of delta-Bi2O3 can be described using the accepted model of a disordered, anion-deficient fluorite structure in space group Fm3m. However, reverse Monte Carlo modelling of the total (Bragg plus diffuse) scattering demonstrates that the local anion environment around the Bi3+ resembles the distorted square pyramidal arrangement found within the stable alpha and metastable beta phases at ambient temperature, which is characteristic of the cation's 6s2 lone-pair configuration.
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