Phase Diagrams of Binary Systems Formed by Rare Earth Trifluorides

Соболев, Б. П.; Федоров, П. П.; Galkin, A. K.; Sidorov, V. S.; Ikrami, D. D.

doi:10.1007/978-1-4615-7119-3_23

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…The set of the orthorhombic rare earth trifluorides, which are stable up to the melting point, is enlarged by using the partial RF3-R'F 3 (R, R' = rare earth elements) isomorphous substitution [3]. Upon this substitution, the mean cationic radius must be close to that of the Tb 3+ ion.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of the ionic conductivity and dielectric response in orthorhombic and monoclinic inorganic fluorides

Trnovcová

Федоров

Val'kovskii

et al. 1997

Ionics

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Abstract. The anisotropy of the ionic conductivity and permittivity of (1) BaRzF 8 (R = rare earth element) single crystals with monoclinic BaTm2F 8 structure and of (2) (~-YF 3 structured) rare earth trifluorides is studied. Single crystals, eutectic composites and ceramics are investigated in a broad temperature range. In the monoclinic BaR2F 8 crystals, a pronounced anisotropy of the ionic conductivity and a slight anisotropy of the permittivity are found. The fastest ionic transport with the lowest activation energy (0.563 eV) and the highest value of the permittivity are observed along the a axis. The temperature dependencies of the fluoride ion conductivities of various orthorhombic rare earth trifluorides differ only slightly from one another. For the bulky single crystals, the conductivity at 500 ~ and the conduction activation enthalpy are equal to 1.1(4)x10 -5 S/cm and 0.75(3) eV, respectively. The ionic conductivity is almost isotropic, but the anisotropy of the permittivity is significant. For the fluorides of both structural types, plausible conduction mechanisms are proposed, networks of most probable conduction paths are presented and the origin of the observed anisotropy of the ionic conductivity is elucidated.

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Section: Introductionmentioning

confidence: 99%

Anisotropy of the ionic conductivity and dielectric response in orthorhombic and monoclinic inorganic fluorides

Trnovcová

Федоров

Val'kovskii

et al. 1997

Ionics

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“…In this study, the defect structures of nonstoichiometric α- M 0.5− x R 0.5+ x F 2+2 x ( M = Na and K; R = Sc, Y, and La–Lu) and M 1− x R x F 2+ x ( M = Ca, Sr, Ba, Cd, and Pb) crystals with a fluorite-type ( F ) structure were investigated. They are formed in two-component M F m - R F 3 (m = 1, 2) systems with the participation of trifluorides of rare-earth elements ( R ) …”

Section: Introductionmentioning

confidence: 99%

“…The degree of disorder (structural defects) in nonstoichiometric crystals can be controlled. This makes such crystals attractive for the fluoride section of materials science, thereby expanding the application areas of traditional single-component fluorides …”

Section: Introductionmentioning

confidence: 99%

“…The history of the development of model representations of the defect structure of F -type nonstoichiometric crystals has been described in ref . The detection of interstitial anions at several positions by X-ray diffraction (in UO 2+ x , Ca 0.61 Ce 0.39 F 2.39 , and Ca 0.9 Y 0.1 F 2.1 ) marks the beginning of modeling the defect structure.…”

Section: Introductionmentioning

confidence: 99%

“…Most experimental studies on the F -NSC defect structure have been performed at standard temperature ( T 293 = 293 K). F -NSC obtained from the melt, as well as subjected to heat treatment with quenching of high-temperature equilibrium, are in a metastable state. , …”

Section: Introductionmentioning

confidence: 99%

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Application of KR₃F₁₀ (R = Gd–Lu and Y) Polymorphism for Modeling the Defect Structure of Nonstoichiometric Multicomponent Fluorite-Type Crystals in T-x Systems

Sulyanova,

Sobolev

2024

J. Phys. Chem. C

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Nonstoichiometric nanostructured crystals (NSC) α-M 0.5−x R 0.5+x F 2+2x (M = Na and K; R = Sc, Y, and La−Lu) and M 1−x R x F 2+x (M = Ca, Sr, Ba, Cd, and Pb) with a f luorite-type (F) structure are widely used in quantum electronics, optics, solid-state ionics (superionic conductors), and bioimaging. However, the temperature dependence of their defect crystal structure, which is fundamental for understanding the numerous properties of F-NSC, remains unexplored. In this study, temperature changes in the F-NSC defect structure in T-x (temperature-composition) systems were simulated. Data on the KR 3 F 10 (R = Gd−Lu and Y) polymorphism were used for modeling. A fragment representing an octacubic cluster (OCC) [M 14−n R n F 64+n ] with a hybrid-type (i-f-) anionic core was isolated in the structure of low-temperature β-KR 3 F 10 (R = Er and Yb). It includes all types of interstitial anions involved in the formation of i-and f-type clusters in the unif ied cluster model (UCM) of the F-NSC defect structure. There is a common tendency for hybrid (i + f) and f-type OCCs to form at low T and i-type OCCs at high T. The UCM was applied to verify T changes in the Ca 0.94 Y 0.06 F 2.06 defect structure within the 293 ÷ 1423 K T range.

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Isomorphous substitutions and Stability of Solid Solutions in La_1-xLn_xF₃, Ln = Ce-Ho Systems

Oleksii

Getaman

Radio

et al. 2021

2021 IEEE 11th International Conference Nanomaterials: Applications &Amp; Properties (NAP)

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Phase Diagrams of Binary Systems Formed by Rare Earth Trifluorides

Cited by 4 publications

References 8 publications

Anisotropy of the ionic conductivity and dielectric response in orthorhombic and monoclinic inorganic fluorides

Anisotropy of the ionic conductivity and dielectric response in orthorhombic and monoclinic inorganic fluorides

Application of KR₃F₁₀ (R = Gd–Lu and Y) Polymorphism for Modeling the Defect Structure of Nonstoichiometric Multicomponent Fluorite-Type Crystals in T-x Systems

Isomorphous substitutions and Stability of Solid Solutions in La_1-xLn_xF₃, Ln = Ce-Ho Systems

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Phase Diagrams of Binary Systems Formed by Rare Earth Trifluorides

Cited by 4 publications

References 8 publications

Anisotropy of the ionic conductivity and dielectric response in orthorhombic and monoclinic inorganic fluorides

Anisotropy of the ionic conductivity and dielectric response in orthorhombic and monoclinic inorganic fluorides

Application of KR3F10 (R = Gd–Lu and Y) Polymorphism for Modeling the Defect Structure of Nonstoichiometric Multicomponent Fluorite-Type Crystals in T-x Systems

Isomorphous substitutions and Stability of Solid Solutions in La1-xLnxF3, Ln = Ce-Ho Systems

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Application of KR₃F₁₀ (R = Gd–Lu and Y) Polymorphism for Modeling the Defect Structure of Nonstoichiometric Multicomponent Fluorite-Type Crystals in T-x Systems

Isomorphous substitutions and Stability of Solid Solutions in La_1-xLn_xF₃, Ln = Ce-Ho Systems