Free Energies of Formation of Some Inorganic Fluorides by Solid State Electromotive Force Measurements*

Heus, R. J.; Egan, J. J.

doi:10.1524/zpch.1966.49.1_2.038

Cited by 48 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 5 shows a number of selected metal, metal fluoride equilibrium coexistence trajectories superimposed on the proposed electrolytic domain for CaF2. Only those trajectories are represented that have been studied as coexistence electrodes in conjunction with CaF2 as the solid electrolyte at elevated temperatures (34,35). Because of the limited number of such studies on fluoride systems, the trajectories shown can only be approximately located on such a plot at the present time.…”

Section: Log Pf2 1/t Diagram For Caf2--f~gure 3 Shows the Proposed Lo...mentioning

confidence: 99%

Conduction Domains for Solid Electrolytes

Patterson

1971

J. Electrochem. Soc.

182

View full text Add to dashboard Cite

The use of solid oxide electrolytes for determining oxygen concentrations in liquid metals has motivated much research of solid electrolyte properties over wide ranges of chemical potential and temperature. A useful scheme for assessing the electrolytic properties of solid electrolytes is that of plotting electronic and electrolytic conduction domains simultaneously with proposed application domains on chemical potential vs. 1/T diagrams. Accordingly, the concept and theoretical origins of conduction domains for solid electrolyte materials are outlined briefly. The origin and usefulness of the concept is discussed with respect to proposed applications of these solid electrolyte materials. Conduction domains for a number of known solid electrolytes are deduced from various conductivity and galvanic cell measurements and the results are presented in the form of conduction domain maps in log Px2 normalvs.1/T space. These maps constitute a survey of present status of knowledge regarding the materials considered. The solid electrolyte materials normalAgBr , normalAgI , normalCuBr , normalCuI , normalCuCl , CaF2 , Zr0.85Ca0.15O1.85 , and Th0.85Y0.15O1.925 are discussed. Controversial implications and interpretations of conflicting data are pointed out.

show abstract

Section: Log Pf2 1/t Diagram For Caf2--f~gure 3 Shows the Proposed Lo...mentioning

confidence: 99%

Conduction Domains for Solid Electrolytes

Patterson

1971

J. Electrochem. Soc.

182

View full text Add to dashboard Cite

show abstract

“…Calcium fluoride has been found to be a suitable electrolyte at high temperatures and over a large range of fluorine potentials (2)(3)(4)(5)(6)(7). Colorless, pure CaF2 contains virtually equal concentrations of interstitial anions and anion vacancies.…”

mentioning

confidence: 99%

Some Studies on a Solid‐State Sulfur Probe for Coal Gasification Systems

Jacob¹,

Rao

Nelson

1978

J. Electrochem. Soc.

View full text Add to dashboard Cite

Measurements on the solid electrolyte cell (Ar -b H2 ~ H2S/CaS + CaF2 ~-(Pt)//CaF2//(Pt) -~-CaF2 ~ CaS/H2S ~-H2 ~-At)show that the emf of the cell is directly related through the Nernst equation to the difference in sulfur potentials established at the two Ar ~-H2 ~ H2S/ electrode interfaces. The electrodes are designed to convert the sulfur potential gradient across the calcium fluoride electrolyte into an equivalent fluorine potential gradient with the aid of the reaction, CaF2(s) ~ 1~ S2(g) -e CaS(s) ~-F2(g). The response time of the probe varies from approximately 9 hr at 990~ to 2.5 hr at 1225~ The conversion of calcium sulfide and/or calcium fluoride into calcium oxide should not be a problem in anticipated commercial coal gasification systems. Suggestions are presented for improving the cell for such commercial applications.

show abstract

“…This value is in excellent agreement with 2.700 +_. 0.015V obtained from the following solid-state cells at 600~ emf (V) ~ r .4-Ni,NiFJCaF2/A1Fs,A1 --1.7~0 _ 0.003 (5, 6) Ni,NiF2/CaF2/MgF2,Mg --2.343 ___ 0.003 (5, 6) Mg,MgF2/CaF2/ThF4,Th 4-0.310 • 0.005 (4) Th,ThF4/CaF2/A1F3,A1 --0.310 +_ 0.003 (4) and the free energies of formation of MgF2 (AG~ = --232.4 ___ 0.6 kg-cal) and A1F9 (~G~ = --306.5 __ 0.7 kg-cal) calculated from calorimetric data (27).…”

Section: Be (Dissolved In Lifmentioning

confidence: 99%