Cations size mismatch versus bonding characteristics: synthesis, structure and oxygen ion conducting properties of pyrochlore-type lanthanide hafnates

Cepeda-Sánchez, Nayeli M.; Díaz-Guillén, J.A.; Mączka, M.; Amador, Ulises; Fuentes, Antonio F.

doi:10.1007/s10853-018-2402-5

Cited by 12 publications

(3 citation statements)

References 36 publications

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“…Based on the (−) deviations, the remaining 22 compounds are suspected ion conductors. Of these, nine are anionic conductors based on ZrO 2 , CeO 2 and Gd 2 Hf 2 O 7 …”

Section: Databasementioning

confidence: 61%

Empirical Electronic Polarizabilities: Deviations from the Additivity Rule. II. Structures Exhibiting Ion Conductivity

Shannon

Kabanova

Fischer

2019

Crystal Research and Technology

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Ion conductivity in minerals and compounds is associated with continuous migration paths and leads to negative total electronic polarizability deviations [ = (α obs −α calc )/α obs )] up to 13%. Such deviations can be related to continuous migration paths determined in an earlier Voronoi-Dirichlet Partition (VDP) analysis of fast-ion conductors, that is, compounds such as LiB 3 O 5 with 1D conductivity, Li 4 SiO 4 with 2D conductivity, and Li 2 SO 4 with 3D conductivity. Using the Voronoi-Dirichlet (VD) method in this study, the migration paths and the dimensionality of many more compounds with negative polarizability deviations are identified. Continuous migration paths are found for the confirmed Li-ion conductors LiFePO 4 and Li 3 VO 4 and for the potential Li-ion conductors LiGeBO 4 , CsLiB 6 O 10 , Li 2 Ti 3 O 7 , LiMn 0.8 Fe 0.17 PO 4 , Li 2 NaPO 4 , and LiNaSO 4 . Similarly, continuous migration paths are found for the confirmed

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“…Based on the (−) deviations, the remaining 22 compounds are suspected ion conductors. Of these, nine are anionic conductors based on ZrO 2 , CeO 2 and Gd 2 Hf 2 O 7 …”

Section: Databasementioning

confidence: 61%

Empirical Electronic Polarizabilities: Deviations from the Additivity Rule. II. Structures Exhibiting Ion Conductivity

Shannon

Kabanova

Fischer

2019

Crystal Research and Technology

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“…A 2 B 2 O 7 type compounds are a diverse class of oxides with broad technological applications [17,34,37,43]. They exist in two main phases of disordered fluorite (DF) and ordered pyrochlore (OP).…”

Section: Introductionmentioning

confidence: 99%

Effects of molten-salt processing parameters on the structural and optical properties of preformed La2Zr2O7:Eu3+ nanoparticles

Garcia

Gupta

Mao

2020

Ceramics International

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“…The assignment of vibrational modes to the observed peaks in the Raman spectra of pyrochlore compounds is controversial and not consistent among all publications concerned with the pyrochlore and related fluorite compounds. We considered the reported assignments of vibrational modes in many publications [271,272,273,274,275,276,277,278,279,280,281,282,283,284,285,286,287,288,289,290,291,220,292,80,293,224,294,295,296,297,298] to arrive at the most plausible interpretation, however we cannot guarantee the correctness of all of the information presented here.…”

Section: Pyrochlore Raman Modesmentioning

confidence: 99%

Synthesis, structure and magnetic properties of the series of compounds Yb2ZrxTi2xO7

Lieberich

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The series of novel compounds Yb 2 Zr x Ti 2−x O 7 , with composition ranging from x = 0.0 to x = 2.0, were synthesized by the solid-state reaction and by the sol-gel method. The structures of the compounds were investigated using x-ray diffraction, Raman spectroscopy and electron microscopy. Pure phase samples could not be synthesized by the solid-state reaction, except for Yb 2 Ti 2 O 7 . The sol-gel samples did form pure phases, although with an increased degree of structural disorder. Along the Yb 2 Zr x Ti 2−x O 7 series the structure ranges from an ordered pyrochlore, for x ≤ 0.5, to a disordered fluorite, for x = 1.0, 1.5, and finally to the rhombohedral δ-phase, for x = 2.0. The morphotropic transition from pyrochlore to fluorite occurs in the range 0.5 < x < 1.0, somewhat less than the value predicted by the structural tolerance factor, x = 1.21. The intermediate compositions, close to the morphotropic phase boundary, exhibit either structural distortions or short-range local order that does not extend to the long-range crystal structure. Low temperature magnetization and AC magnetic susceptibility measurements were used to characterize the magnetic ground state of these magnetically frustrated compounds. The transition to long range magnetic order is suppressed with increasing structural disorder, suggesting an increase in magnetic frustration and possible stabilization of a spin liquid ground state for Yb 2 Zr 2 O 7 .

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Cations size mismatch versus bonding characteristics: synthesis, structure and oxygen ion conducting properties of pyrochlore-type lanthanide hafnates

Cited by 12 publications

References 36 publications

Empirical Electronic Polarizabilities: Deviations from the Additivity Rule. II. Structures Exhibiting Ion Conductivity

Empirical Electronic Polarizabilities: Deviations from the Additivity Rule. II. Structures Exhibiting Ion Conductivity

Effects of molten-salt processing parameters on the structural and optical properties of preformed La2Zr2O7:Eu3+ nanoparticles

Synthesis, structure and magnetic properties of the series of compounds Yb2ZrxTi2xO7

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