Solid state synthesis, structure and transport properties of compositions in the CaRu1−xTixO3−δ system

Vashook, V.; Nitsche, David; Vasylechko, L.; Rebello, Jeanette S.; Zösel, J.; Guth, U.

doi:10.1016/j.jallcom.2009.05.105

Cited by 5 publications

(2 citation statements)

References 18 publications

(16 reference statements)

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“…The XRD analyses were performed using GSAS and assumed the structures to be in the Pbnm space group, as is typical of perovskite structures. The input data of the theoretical model were taken from the Inorganic Crystal Structure Database (ICSD) N. 165801 [16]. Good correlation between the observed and calculated XRD patterns was observed (Fig.…”

Section: Fig 2 (A-d)mentioning

confidence: 96%

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

Gonçalves

Lima

Godinho

et al. 2015

Ceramics International

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Section: Fig 2 (A-d)mentioning

confidence: 96%

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

Gonçalves

Lima

Godinho

et al. 2015

Ceramics International

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“…It seems plausible that due to the ordered arrangement of the octahedra the complete delocalization of Ru cation could be inhibited by the HoO6 octahedra by physical separation of the two successive RuO6 octahedra.In AHR, every second Ru is substituted by Ho forming a rock-salt arrangement and disrupting the Ru-O perovskite motif of intersecting 1D chains. As a result the AHR shows more localised electrical behaviour than most of the parent perovskite derived ruthenates[50][51][52][53][54].If the dc conductivity is Arrhenius activated, then ∝ , where E  a is the activation energy for dc conductivity. For a fixed number of sites N and fixed hopping length R, it can be shown ∝[27].…”

mentioning

confidence: 99%

Time–temperature superposition in the grain and grain boundary response regime of A₂HoRuO₆(A = Ba, Sr, Ca) double perovskite ceramics: a conductivity spectroscopic analysis

2017

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The pursuit for an appropriate universal scaling factor to satisfy the time-temperature superposition principle for grain and grain boundary responses has been explored in the ac conductivity domain for polycrystalline double perovskite oxides A2HoRuO6 (AHR; A = Ba, Sr, Ca). The samples show different structural phases ranging from cubic to monoclinic with decreasing ionic radii. The degree of distortion in the materials is correlated to the strength of bonding through the bond valence sum (BVS). The conductivity spectra for all the samples obey the power law behaviour. The contribution of different microstructural features to the conduction process is established. Thermal variation of dc resistivity points towards a gradual crossover from nearest neighbour to variable range hopping. The activation energies obtained from dc conductivity, hopping frequency and relaxation frequency show close correlation between the conduction and relaxation mechanisms. The scaled conductivity curves for AHR showed the presence of two different conduction processes with dissimilar activation energies in the grain boundary and grain response regimes. It is thus concluded that a single scaling parameter is insufficient to satisfy the time temperature superposition principle universally when two different thermally activated regions are present simultaneously in the materials.

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ChemInform Abstract: Solid State Synthesis, Structure and Transport Properties of Compositions in the CaRu_1‐xTi_xO_3‐δ System.

et al. 2009

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Solid State Synthesis, Structure and Transport Properties of Compositions in the CaRu1-xTixO3-δ System. -The title compounds (0 ≤ x ≤ 1) are prepared by solid state reactions of RuO2-x, TiO2, and CaCO3 (alumina crucibles, 800-1300°C, 10-130 h) and characterized by powder XRD and conductivity measurements. They crystallize with the GdFeO3-type structure in the space group Pnma. Apart from CaRuO3 with a combined p-/n-type conductivity all the compounds are n-type semiconductors. The materials show high catalytic activity for propene oxidation and no activity for NO2 reduction.

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Solid state synthesis, structure and transport properties of compositions in the CaRu1−xTixO3−δ system

Cited by 5 publications

References 18 publications

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

Time–temperature superposition in the grain and grain boundary response regime of A₂HoRuO₆(A = Ba, Sr, Ca) double perovskite ceramics: a conductivity spectroscopic analysis

ChemInform Abstract: Solid State Synthesis, Structure and Transport Properties of Compositions in the CaRu_1‐xTi_xO_3‐δ System.

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Solid state synthesis, structure and transport properties of compositions in the CaRu1−xTixO3−δ system

Cited by 5 publications

References 18 publications

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

Synthesis of Pr3+-doped CaTiO3 using polymeric precursor and microwave-assisted hydrothermal methods: A comparative study

Time–temperature superposition in the grain and grain boundary response regime of A2HoRuO6(A = Ba, Sr, Ca) double perovskite ceramics: a conductivity spectroscopic analysis

ChemInform Abstract: Solid State Synthesis, Structure and Transport Properties of Compositions in the CaRu1‐xTixO3‐δ System.

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Product

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Time–temperature superposition in the grain and grain boundary response regime of A₂HoRuO₆(A = Ba, Sr, Ca) double perovskite ceramics: a conductivity spectroscopic analysis

ChemInform Abstract: Solid State Synthesis, Structure and Transport Properties of Compositions in the CaRu_1‐xTi_xO_3‐δ System.