Effect of fluorite phase on the electrical conductivity of (Sm1−Dy )2Zr2O7 pyrochlore

Arachi, Yoshinori; Nabeshima, Daiki

doi:10.1016/j.ssi.2013.12.028

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…In this study, the conductivity for Lu 2 (Ti 1-x Hf x ) 2 O 7 (x = 0.4-0.5) with a defect-fluorite structure increased with increasing r A /r B , however, highest conductivity was observed at x = 0.2, not at the phase boundary x = 0.3. This is consistent with that reported in Ho 2 (Zr x Ti 1-x ) 2 O 7 [26] and (Sm 1-x Dy x ) 2 Zr 2 O 7 [28] systems. Arachi et al [28] reported the phase boundary of (Sm 1-x Dy x ) 2 Zr 2 O 7 was at x = 0.4 while the highest conductivity happened at x = 0.3.…”

Section: Resultssupporting

confidence: 92%

“…This is consistent with that reported in Ho 2 (Zr x Ti 1-x ) 2 O 7 [26] and (Sm 1-x Dy x ) 2 Zr 2 O 7 [28] systems. Arachi et al [28] reported the phase boundary of (Sm 1-x Dy x ) 2 Zr 2 O 7 was at x = 0.4 while the highest conductivity happened at x = 0.3. They attributed it to the possible existence of a fluorite symmetry at x = 0.4 evidenced by the Raman spectra, whereas the XRD pattern showed a single pyrochlore phase.…”

Section: Resultssupporting

confidence: 92%

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Fabrication and electrical conductivity of Lu₂(Ti_1-xHf_x)₂O₇ transparent ceramics prepared by spark plasma sintering

Liu

Wang

Fan

et al. 2021

Journal of Asian Ceramic Societies

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Lu 2 (Ti 1-x Hf x ) 2 O 7 (x = 0-0.5) transparent ceramics were fabricated by reactive spark plasma sintering using commercially available Lu 2 O 3 , TiO 2 and HfO 2 powders. Effect of Hf content x on the phase evolution, microstructure, density, transmittance and electrical conductivity of the resulting ceramics were investigated. Lu 2 (Ti 1-x Hf x ) 2 O 7 transparent ceramic had a pyrochlore structure in the range of x = 0-0.3, while preserved a defect-fluorite structure at x = 0.4-0.5. The lattice parameter and theoretical density increased linearly with increasing Hf content x. The average grain size decreased at x = 0-0.3 and kept almost constant at x = 0.4-0.5. All the samples exhibited a dense microstructure and the highest in-line transmittance was 57% at 550 nm at x = 0. The highest bulk conductivity was 1.7 × 10 −2 S m −1 at 1073 K for Lu 2 (Ti 0.8 Hf 0.2 ) 2 O 7 , with an activation energy of 1.16 eV.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 92%

Fabrication and electrical conductivity of Lu₂(Ti_1-xHf_x)₂O₇ transparent ceramics prepared by spark plasma sintering

Liu

Wang

Fan

et al. 2021

Journal of Asian Ceramic Societies

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“…Experimental studies have shown that tremendous increases can be obtained by varying the chemistry content of the material. [19][20][21][22][23][24][25][26] Seminal work by Tuller investigated oxygen diffusion in Gd 2 (Zr y Ti 1Ày ) 2 O 7 , and observed that the diffusivity increased by up to four orders of magnitude when zirconium was introduced. 19 The cause of this enhancement was attributed to the introduction of cation disorder, characterized by the exchange of A and B cations (or antisites) which is easier to achieve with Zr than Ti, and the concurrent disordering of the oxygen sublattice, enhancing the diffusivity.…”

Section: Introductionmentioning

confidence: 99%

Structural vs. intrinsic carriers: contrasting effects of cation chemistry and disorder on ionic conductivity in pyrochlores

Perriot

Uberuaga

2015

J. Mater. Chem. A

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We use molecular dynamics simulations to investigate the role of cation disorder on oxygen diffusion in Gd 2 Zr 2 O 7 (GZO) and Gd 2 Ti 2 O 7 (GTO) pyrochlores, a class of complex oxides which contain a structural vacancy relative to the basic fluorite structure. The introduction of disorder has distinct effects depending on the chemistry of the material, increasing the mobility of structural carriers by up to four orders of magnitude in GZO. In contrast, in GTO, there is no mobility at zero or low disorder on the ns timescale, but higher disorder liberates the otherwise immobile carriers, allowing diffusion with rates comparable to GZO for the fully disordered material. We show that the cation disorder enhances the diffusivity by both increasing the concentration of mobile structural carriers and their individual mobility.The disorder also influences the diffusion in materials containing intrinsic carriers, such as additional vacancies V O or oxygen interstitials O I . While in ordered GZO and GTO the contribution of the intrinsic carriers dominates the overall diffusion of oxygen, O I in GZO contributes along with structural carriers, and the total diffusion rate can be calculated by assuming simple additive contributions from the two sources. Although the disorder in the materials with intrinsic defects usually enhances the diffusivity as in the defect-free case, in low concentrations, cation antisites A B or B A , where A ¼ Gd and B ¼ Zr or Ti, can act as traps for fast intrinsic defects. The trapping results in a lowering of the diffusivity, and causes a non-monotonic behavior of the diffusivity with disorder. By contrast, in the case of slow intrinsic defects, the main effect of the disorder is to liberate the structural carriers, resulting in an increase of the diffusivity regardless of the defect trapping.

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Potential of pyrochlore structure materials in solid oxide fuel cell applications

Anantharaman

Dasari

2021

Ceramics International

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Effect of fluorite phase on the electrical conductivity of (Sm1−Dy )2Zr2O7 pyrochlore

Cited by 9 publications

References 14 publications

Fabrication and electrical conductivity of Lu₂(Ti_1-xHf_x)₂O₇ transparent ceramics prepared by spark plasma sintering

Fabrication and electrical conductivity of Lu₂(Ti_1-xHf_x)₂O₇ transparent ceramics prepared by spark plasma sintering

Structural vs. intrinsic carriers: contrasting effects of cation chemistry and disorder on ionic conductivity in pyrochlores

Potential of pyrochlore structure materials in solid oxide fuel cell applications

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Effect of fluorite phase on the electrical conductivity of (Sm1−Dy )2Zr2O7 pyrochlore

Cited by 9 publications

References 14 publications

Fabrication and electrical conductivity of Lu2(Ti1-xHfx)2O7 transparent ceramics prepared by spark plasma sintering

Fabrication and electrical conductivity of Lu2(Ti1-xHfx)2O7 transparent ceramics prepared by spark plasma sintering

Structural vs. intrinsic carriers: contrasting effects of cation chemistry and disorder on ionic conductivity in pyrochlores

Potential of pyrochlore structure materials in solid oxide fuel cell applications

Contact Info

Product

Resources

About

Fabrication and electrical conductivity of Lu₂(Ti_1-xHf_x)₂O₇ transparent ceramics prepared by spark plasma sintering

Fabrication and electrical conductivity of Lu₂(Ti_1-xHf_x)₂O₇ transparent ceramics prepared by spark plasma sintering