Showing papers in "Solid State Ionics in 1991"

TL;DR: In this article, the perovskite-type oxides, La 0.6 A' 0.4 Co 0.8 Fe 0.2 O 3−δ (A'=La, Ca, S, S), and La 0, 6 S 0.1 B' 0, Co 0, Ni, Co, Ni and Cu 0, respectively, were separately measured at 770-1150 in air by means of a four-probe ionic dc technique (electron-blocking method) and a standard fourprobe dc technique.

TL;DR: In this paper, a lithium salt (Li 3 PO 4 or Li 3 BO 3 ) was added to LiTi 2 (PO 4 ) 3 to obtain a dense pellet of the phosphate.

TL;DR: In this paper, a CaZrO 3 -based ceramics, in which trivalent cations such as In, Ga and Sc were substituted for Zr, were synthesized.

TL;DR: In this article, a rationale for predicting new perovskite solid electrolytes was developed based on empirical relationships found between activation energy for anionic transport and perovsite crystallographic-related parameters including (i) the average metal-oxygen bond energy of the pervskite lattice, (ii) the degree of openness, or free volume, of the lattice and (iii) the critical radius ( r c ) saddle point formed by two A and one site through which anionic mediation proceeds.

TL;DR: In this article, a perovskite solid electrolyte, BaCeO 3 :Gd (10 mol), was used for hydrogen-oxygen fuel cells with open circuit voltages of 1.2 to 1.0 V at 600 and 800°C respectively.

TL;DR: In this paper, measurements are made by high temperature gravimetry, coulometric titration and iodometry on the oxides with x = 0.2 and 0.4.

TL;DR: In this paper, an empirical correlation is established for relating Raman stretching frequencies of Niobium-oxygen (NbO) bonds to their respective bond distances in niobium oxide compounds.

TL;DR: In this paper, the Vogel-Tamman-Fulcher representation of the temperature dependence of both sets of quantities is described: Λ/D = A exp{−B/ (T − T 0)}.

TL;DR: Partial substitution of metals such as Cu or Zn for vanadium in Bi4V2O11 leads to materials exhibiting high anionic conductivities at temperatures as low as 500 K.

TL;DR: In this article, the properties of superionic proton conductors were examined as a function of temperature in the TGA and DSC curves, in the 300-500 K temperature range.

TL;DR: In this paper, the segregation behavior of yttrium and impurities in yttria-tetragonal zirconia polycrystals (Y-TZP) was studied at temperatures between 800 and 1500°C.

TL;DR: In this article, the 1H and 17O diffusion coefficients of aqueous hydrochloric acid of different molarity have been measured and the ratio DH/DO provided experimental proof for intermolecular proton transfer in thermodynamic equilibrium.

TL;DR: In this article, a defect model based on a general lattice electroneutrality condition was proposed for BaTiO 3, which is essentially based on the assumption that the concentration of both extrinsic defects and the Schottky-type defects are at comparable level.

TL;DR: The theoretical and experimental advancements made in the study of polytypism in the last few decades have been reviewed in this article, and the impact of the advancements on widening the scope of poly typism and consequential need felt for revising the very concept of the polytypic has been discussed.

TL;DR: In this article, the proton conduction was demonstrated in doped perovskites BaCe1−xMxO3−α (M=Y, Yb, Nd, Gd, La; x=0.05, 0.10) at high temperature in a moist atmosphere.

TL;DR: In this article, the impedance of the Au, O2 (g) / yttria stabilized zirconia interface has been measured as function of the overpotential, temperature and oxygen partial pressure.

TL;DR: In this article, three different reaction models are discussed which describe the oxygen exchange reaction at the Au, O2(g)/yytria stabilized zirconia interface, which can predict the apparent Tafel behavior of the current-overpotential curve.

TL;DR: In this paper, the dielectric properties of AgI-based fast ion conducting glasses have been examined using modulus formalism and inverse relation has been found between the stretching exponent and structural unpinning number which characterizes fast ion conduction.

TL;DR: The theory and experiment of the growth of ionically conducting yttria-stabilized zirconia (YSZ) and electronically conducting LaCrO 3 is discussed in this article.

TL;DR: In this article, the properties of mixed conduction in BaCe 0.9 Nd 0.1 O 3 − α were investigated by substituting Ca for Ba partially.

TL;DR: In this paper, the isotope effect on electrical conductivity of a single crystal of Y-doped SrZrO3 was investigated and it was shown that the electrical conductivities are referred to the hole conduction at the temperature above 700°C and to the protonic conduction below 500°C.

TL;DR: In this article, the intercalation behavior of benzenecarboxylic acids in the interlayer of hydrotalcite was investigated by using the chemical reaction of rock-salt type magnesium aluminum oxide, Mg0.61Al0.26O, and various benzen-carboxylates in aqueous solutions at 50-70°C.

TL;DR: In this article, fuel cell and concentration cell experiments have been carried out with various solid sulphates as the solid electrolyte, and correlations between the fuel cell currents and the electrical conductivity of the salt were observed.

TL;DR: In this article, the authors studied the kinetics of exchange of alkali ions with H + in hydrous stannic oxide from hydroxides and hydroxide/chloride solutions and found that the exchange rate was controlled by the interdiffusion of the alkali ion and H + inside the hydrous oxide.

TL;DR: In this article, a Randles-type equivalent circuit with diffusional impedance is described, in which the electrode resistance is the sum of a charge transfer resistance and a diffusional resistance.

TL;DR: In this paper, the electrical transport behavior and defect structure of Ca-doped YCrO3 were studied using electrical conductivity and Seebeck coefficient measurements as a function of oxygen activity and temperature.

TL;DR: In this article, the thermal stability of several solid solutions obtained starting from the reactive system Ni/Li 2 CO 3 has been investigated and it is shown that solid solutions with similar lithium content but different vacancies concentration can be obtained depending on the preparation conditions.

TL;DR: In this paper, an alpha-layered zirconium carboxy n-alkyl phosphonates, Zr(O 3 P(CH 2 ) n COOH) 2 with n = 1−5 have been prepared and characterized by X-ray diffraction, TG-DTA, DSC and ac-conductivity measurements.

TL;DR: In this article, solid state ionics are classified according to the characteristic feature of their structures, and various types of structures are explained in detail, in particular, the anharmonic thermal vibration of mobile ions studied by X-ray and neutron diffraction is dealt with as an important characteristic of the solid-state ionics.

TL;DR: In this paper, the authors investigated the rechargeability of pure MnO 2-based cathodes in Li cells and found that they are inherently reversible, but with different kinetic limitations.