Conductivity Of Solid Solutions Research Articles

Ionic conduction in solid solution of the system La2O3-CaF2

The crystal phase and the electrical conduction in sesquioxide-alkaline earth difluoride systems were investigated. LaOF-type cubic solid solution was found in the system La2O3-CaF2. This phase showed anion conductivity comparable to that of YF3-doped CaF2. Electrolysis by Tubandt's method showed that the conduction was predominantly attributed to fluoride ions. In this solid electrolyte, the fluoride ion is easily substituted by oxide ion through cathode reaction in the oxygen atmosphere.

Ionic conductivity of substituted Li 7TaO 6 phases

Lithium ion conductivity in solid solutions of Li 7 Ta 1- x Nb x O 6, Li 7 Ta 1- x Bi x O 6, Li 7+ x Ta 1- x Zr x O 6 and Li 7-2 x Ca x TaO 6 has been measured as a function of temperature and composition using the complex impedance method. At 200°C the conductivities of Li 7 Ta 0.7 Nb 0.3 O 6, Li 7.4 Ta 0.6 Zr 0.4 O 6 and Li 6.6 Ca 0.2 TaO 6 are 4.3 × 10 -4( ωcm) -1, 3.0 × 10 -4( ωcm) -1, 4.0 × 10 -4( ωcm) -1 and 1.6 × 10 -4( ωcm) -1 respectively. The results are discussed in relation to structural properties.

Electric conductivity and cation ordering in the octahedral sublattice of solid solutions with spinel structure

1. The concentration dependences of the activation energy of electric conductivity in solid solutions with spinel structure can provide valuable information on the type of short-range order in the octahedral sublattice. 2. In the octahedral sublattice of solid solutions with type 2–3 spinel structure there exist type 1∶7, 1∶3, 3∶5, and 1∶1 short-range order configurations of differently charged cations. 3. Making use of the composition dependence of the activation energy of electric conductivity, one may calculate the cation distribution in the sublattices for systems characterized by more than one cation distribution function. 4. Knowing the cation distribution in a solid solution, it is possible to predict the concentrations at which minimal and maximal activation energies should be expected.

ChemInform Abstract: IONIC CONDUCTIVITY OF LITHIUM ORTHOSILICATE‐LITHIUM PHOSPHATE SOLID SOLUTIONS

AbstractDie Li‐Ionenleitfähigkeit in Mischkristallen zwischen Li4SiO4 und Li3PO4 wird als Funktion von Temperatur und Zusammensetzung mit Hilfe einer Wechselstrommethode gemessen.

Ionic Conductivity of Lithium Orthosilicate—Lithium Phosphate Solid Solutions

Lithium ion conductivity in solid solutions formed between and has been measured as a function of temperature and composition using a‐c techniques. Highest conductivities were found at 50 and 60 mole percent (m/o) phosphate. Empirical conductivity parameters are presented and qualitatively analyzed in terms of structural and compositional effects. Unit cell parameters have been determined across the entire range of solid solution by x‐ray powder diffraction.

Thermal conductivity of binary disordered continuous solid solutions

A simplified model for the structure and an approximate method of computing the thermal conductivity of continuous solid solutions are proposed. The method is suitable for a check, extension of the measurement results, and prediction of the thermal conductivity of solid solutions.

The electrical conductivity of solid solutions of TiO2 in ?-Al2O3 as a function of the partial oxygen pressure

An investigation was carried out of the electron conductivity as a function of the partial oxygen pressure of solid solutions of TiO2 inα-Al2O3 over the temperature range 1100–1400°C at low partial oxygen pressures (10−8−10−18 atm). Up to 1100°C the predominant types of defect are once only ionized impurity centers Ti+(Al) and electrons in the conductivity zone. At higher temperatures the main type of defect takes the form of once only ionized impurity centers, oxygen vacancies, and electrons in the conductivity zone.

Effect of microstructuee on the electric conductivity of solid solutions of ZrO2-Sc2O3

In the region of homogeneous solid solutions for ZrO2-Sc2O3 with a cubic structure of the fluorite type the size of the crystals is, in a certain temperature range, an important factor influencing the conductivity of these materials. The role of this factor is manifest in the position of the maximum on the conductivity isotherms, in the increased conductivity of the fine grained materials obtained by the hot pressing method, and also in the reduction in the conductivity of ceramics subjected to additional recrystallization.

Luminescence and Conduction in Solid Solutions of Cerium Sulfide in Strontium Sulfide

Solid solutions of in were prepared by fluxing with . X‐ray precision lattice constant measurements show a solid solubility of 1 atom per cent for nitrogen‐fired samples and 10 atom per cent for ‐fired samples. This difference in solubility is connected with the formation of by reaction with traces of oxygen or moisture in the nitrogen. The existence of such a high solubility limit is explained on the basis of the formation of vacancies in the cation lattice (Schottky defects). Measurement of ionic conductivity confirms this. From the x‐ray and conductivity data, it is concluded that Ce enters the lattice in the trivalent state and in substitutional positions. The luminescent properties of both series of solid solutions show a shift with increasing cerium concentration. The emission peak of the ‐fired series shifted from 4900 Å in a sample with 0.5 atom per cent Ce to 5100 Å in samples with 2 per cent Ce or more. The emission peak of the ‐fired samples shifts from 5050 Å at 1 per cent Ce to 5700 Å at 10 per cent Ce. In this series, all samples with 3 per cent Ce or more are only fluorescent, while those with lower Ce content are phosphorescent. These shifts are explained on the basis of a lowering of the bottom of the conduction band with respect to the emitting levels, causing the shift toward longer emission wavelengths, and with respect to the shallow phosphorescent traps, causing the transition from phosphorescence to fluorescence.