Ionic Conductivity of Yttrium Fluoride and Lutetium Fluoride

O’Keeffe, Michael

doi:10.1126/science.180.4092.1276

Cited by 59 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At high temperatures, the fast ionic conductivity is also observed in the ~-YF 3 and ~-LuF 3 polycrystals [11]. The structural similarity of the tysonite-structured and the ~-YF 3 structured crystals [12] leads to an assumption that a fast fluoride ion mobility might occur also in the ~-YF 3 structured crystals.…”

Section: Introductionmentioning

confidence: 98%

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

Trnovcová

Федоров

Val'kovskii

et al. 1997

Ionics

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 98%

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

Trnovcová

Федоров

Val'kovskii

et al. 1997

Ionics

View full text Add to dashboard Cite

show abstract

“…Doped with trivalent REE cations, YF 3 is also applicable as an optical filter in 157-nm photolithography [ 9 ]. Another emerging field of application is solid-state fluoride batteries, resulting from the very high conductivity of fluoride anions [ 10 , 11 , 12 , 13 , 14 ]. HoF 3 is interesting for magnetic high-field applications as, e.g., a contrast agent, due to the very high magnetic moment of holmium [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

First Principle Surface Analysis of YF3 and Isostructural HoF3

2022

View full text Add to dashboard Cite

The trifluorides of the two high field strength elements yttrium and holmium are studied by periodic density functional theory. As a lanthanide, holmium also belongs to the group of rare earth elements (REE). Due to their equivalent geochemical behavior, both elements form a geochemical twin pair and consequently, yttrium is generally associated with the REE as REE+Y. Interestingly, it has been found that DFT/DFT+U describe bulk HoF3 best, when the 4f-electrons are excluded from the valence region. An extensive surface stability analysis of YF3 (PBE) and HoF3 (PBE+Ud/3 eV/4f-in-core) using two-dimensional surface models (slabs) is performed. All seven low-lying Miller indices surfaces are considered with all possible stoichiometric or substoichiometric terminations with a maximal fluorine-deficit of two. This leads to a scope of 24 terminations per compound. The resulting Wulff plots consists of seven surfaces with 5–26% abundance for YF3 and six surfaces with 6–34% for HoF3. The stoichiometric (010) surface is dominating in both compounds. However, subtle differences have been found between these two geochemical twins.

show abstract

“…reported YF 3 and LuF 3 SSEs in 1973, and fluorides with larger cations showed high electrical conductivity compared to LiF. [ 70 ] In the 1980s, the T.Oi group studied mLiF·nMF 3 (M=Al, Cr, Sc, or Al + Sc). [ 71,72 ] This type of fluoride solid electrolyte shows a relatively low ionic conductivity of about 10 −7 S cm −1 at RT.…”

Section: Historical Overview Of Fssesmentioning

confidence: 99%

Fluorinated Solid‐State Electrolytes for Lithium Batteries: Interface Design and Ion Conduction Mechanisms

et al. 2023

View full text Add to dashboard Cite

Fluorinated solid‐state electrolytes (FSSEs) exhibit good compatibility with positive materials, wide electrochemical windows, and stable chemical stability, which have been widely used in all‐solid‐state lithium batteries (ASSLBs). However, the practical application of fluorinated solid electrolytes still faces great challenges due to factors such as ionic conductivity, chemical stability, and current limitation. Herein, the development history of FSSEs is reviewed first. Subsequently, the recent advances in the improvement of ion conductivity, chemical stability, and current limit by structural design, interface regulation strategies, etc. are analyzed. Finally, the design requirements for future generations of FSSEs are prospected, focusing on the latest simple one‐step synthesis methods, improving the ionic conductivity at room temperature, and optimizing the electrochemical stability window of FSSEs.

show abstract

Ionic Conductivity of Yttrium Fluoride and Lutetium Fluoride

Cited by 59 publications

References 5 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

First Principle Surface Analysis of YF3 and Isostructural HoF3

Fluorinated Solid‐State Electrolytes for Lithium Batteries: Interface Design and Ion Conduction Mechanisms

Contact Info

Product

Resources

About