Характеристики Li-=SUP=-+-=/SUP=--ионной проводимости кристаллов Li-=SUB=-3-=/SUB=-R-=SUB=-2-=/SUB=-(PO-=SUB=-4-=/SUB=-)-=SUB=-3-=/SUB=- (R=Fe,Sc) в суперионном состоянии

AbstractThe characteristics of Li+-ion conductivity σdc of structural γ modifications of Li_3R_2(PO_4)_3 compounds (R = Fe, Sc) existing in the superionic state have been investigated by impedance spectroscopy. The type of structural framework [R_2P_3O_12]_∞^3- affects the σdc value and the σdc activation enthalpy in these compounds. The ion transport activation enthalpy in γ-Li_3R_2(PO_4)_3 (Δ H _σ = 0.31 ± 0.03 eV) is lower than in γ-Li_3Fe_2(PO_4)_3 (Δ H _σ = 0.36 ± 0.03 eV). The conductivity of γ-Li_3Fe_2(PO_4)_3 (σ_dc = 0.02 S/cm at 573 K) is twice as high as that of γ-Li_3R_2(PO_4)_3. A decrease in temperature causes a structural transformation of Li_3R_2(PO_4)_3 from the superionic γ modification (space group Pcan ) through the intermediate metastable β modification (space group P 2_1/ n ) into the “dielectric” α modification (space group P 2_1/ n ). Upon cooling, σdc for both phosphates decreases by a factor of about 100 at the superionic TSIC transition. In Li_3Fe_2(PO_4)_3 σdc gradually decreases in the temperature range T _SIC = 430–540 K, whereas in Li_3R_2(PO_4)_3 σdc undergoes a jump at T _SIC = 540 ± 25 K. Possible crystallochemical factors responsible for the difference in the σdc and Δ H _σ values and the thermodynamics and kinetics of the superionic transition for Li_3R_2(PO_4)_3 are discussed.

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Separating bulk from grain boundary Li ion conductivity in the sol–gel prepared solid electrolyte Li1.5Al0.5Ti1.5(PO4)3

Journal of Materials Chemistry A ◽

10.1039/c5ta06379e ◽

2015 ◽

Vol 3 (42) ◽

pp. 21343-21350 ◽

Cited By ~ 76

Author(s):

Stefan Breuer ◽

Denise Prutsch ◽

Qianli Ma ◽

Viktor Epp ◽

Florian Preishuber-Pflügl ◽

...

Keyword(s):

Impedance Spectroscopy ◽

Grain Boundary ◽

Ion Transport ◽

Solid Electrolyte ◽

Transport Properties ◽

Low Temperatures ◽

Sol Gel ◽

Ion Conductivity ◽

Li Ion ◽

Ceramic Electrolytes

Impedance spectroscopy measurements down to very low temperatures allowed for resolving bulk ion transport properties in highly conducting ceramic electrolytes.

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The kinetics of Li-ion deintercalation in the Li-rich layered Li1.12[Ni0.5Co0.2Mn0.3]0.89O2 studied by electrochemical impedance spectroscopy and galvanostatic intermittent titration technique

Electrochimica Acta ◽

10.1016/j.electacta.2013.06.134 ◽

2013 ◽

Vol 109 ◽

pp. 355-364 ◽

Cited By ~ 61

Author(s):

Yansong Bai ◽

Xianyou Wang ◽

Xiaoyan Zhang ◽

Hongbo Shu ◽

Xiukang Yang ◽

...

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Galvanostatic Intermittent Titration Technique ◽

Li Ion ◽

Kinetics Of ◽

Titration Technique

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Understanding electronic and Li-ion transport of LiNi0.5Co0.2Mn0.3O2 electrodes affected by porosity and electrolytes using electrochemical impedance spectroscopy

Journal of Power Sources ◽

10.1016/j.jpowsour.2021.230338 ◽

2021 ◽

Vol 510 ◽

pp. 230338

Author(s):

Wonhee Kim ◽

Daeun Jang ◽

Hyeong-Jin Kim

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Ion Transport ◽

Electrochemical Impedance ◽

Li Ion

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Irradiation behavior of pyrolytic silicon carbide

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074288 ◽

1983 ◽

Vol 41 ◽

pp. 72-73

Author(s):

R. J. Lauf

Keyword(s):

Silicon Carbide ◽

Fission Products ◽

Thermodynamics And Kinetics ◽

Neutron Fluences ◽

Fuel Particles ◽

Sic Coatings ◽

Irradiation Behavior ◽

Kinetics Of ◽

Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

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Thermodynamics and kinetics of hydriding of the Zr(Ni0.75V0.25)2 laves phase

European Journal of Control ◽

10.3166/acsm.29.2.1-9 ◽

2004 ◽

Vol 29 (2) ◽

pp. 1-9

Author(s):

Mustapha Boulghallat ◽

Ahmed Jouaiti ◽

Norbert Gérard

Keyword(s):

Laves Phase ◽

Thermodynamics And Kinetics ◽

Kinetics Of

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Faculty Opinions recommendation of Effect of material flexibility on the thermodynamics and kinetics of hydrophobically induced evaporation of water.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.727407951.793532404 ◽

2017 ◽

Author(s):

Qiang Cui

Keyword(s):

Thermodynamics And Kinetics ◽

Kinetics Of

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THERMODYNAMICS AND KINETICS OF AQUEOUS PIPERAZINE WITH POTASSIUM CARBONATE FOR CARBON DIOXIDE ABSORPTION

10.2172/839556 ◽

2005 ◽

Cited By ~ 14

Author(s):

John T. Cullinane

Keyword(s):

Carbon Dioxide ◽

Potassium Carbonate ◽

Carbon Dioxide Absorption ◽

Thermodynamics And Kinetics ◽

Kinetics Of

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The effect of composition of cobalt-molybdenum catalysts on their surface acidity and isomerisation activity

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19800697 ◽

1980 ◽

Vol 45 (3) ◽

pp. 697-702 ◽

Cited By ~ 1

Author(s):

Vlastimil Vyskočil ◽

Miroslav Zdražil

Keyword(s):

Chromatographic Method ◽

Surface Acidity ◽

Parallel Reaction ◽

Molybdenum Catalysts ◽

The Difference ◽

Kinetics Of ◽

Alumina Catalysts

Kinetics of isomerisation of cyclohexene to methylcyclopentene proceeding as parallel reaction to hydrogenation of cyclohexene to cyclohexane on cobalt-molybdenum catalysts of different composition has been measured. The surface acidity of these catalysts was estimated from the difference in the adsorption of toluene and heptane which was measured by chromatographic method. In a series of catalysts containing molybdenum the acidity parallels isomerisation activity. Cobalt on alumina catalysts and alumina itself have greater acidity but exhibit lower isomerisation activity compared to the catalysts containing molybdenum.

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