Search Results

You are looking at 1 - 10 of 217 items for :

  • "Electrical conductivity" x
  • All content x
Clear All

AgI–Ag 2 O–V 2 O 5 glass matrix affects the E c and E s values significantly [ 20 ]. In the present work, we have discussed a new and extremely sensitive method, viz. electrical conductivity versus temperature cycles at various controlled

Restricted access

properties, structure, and electrical conductivity of LnX 3 – MX systems. It reports the thermodynamic and transport properties of DyBr 3 – RbBr binary system. The only literature information on this system was the graphic form of the phase diagram reported

Restricted access

Abstract  

Electrical conductivity of some dibenzoylmethane arylhydrazones (DBMAH) were measured during heating and reheating runs. The observed variation of the conductance of the polycrystalline sample during thermal agitation was found to depend on the ordering and disordering of molecules which in turn cause the lattice dipole to distort. A semiconducting behavior was detected for these systems as it was deduced from their conductance values (1.7 × 10−6 − 8.25 × 10−7 ohm−1 cm−1). The presence of substituents affects markedly the measured electrical conductivity and calculated activation energy values.

Restricted access

Abstract  

Phase equilibrium in the CeBr3–CsBr binary system was established from differential scanning calorimetry (DSC). This system includes three compounds, namely Cs3CeBr6, Cs2CeBr5 and CsCe2Br7; and three eutectics located at CeBr3 molar fraction x = 0.125; 0.459 and 0.700, respectively. Cs3CeBr6 undergoes a solid–solid phase transition at 712 K and melts congruently at 1034 K. Cs2CeBr5 decomposes in the solid state into Cs3CeBr6 and CsCe2Br7 at 685 K. The third compound, CsCe2Br7, melts congruently at 877 K. The electrical conductivity of CeBr3–CsBr liquid mixtures was measured down to temperatures below solidification over the whole composition range. Results obtained are discussed in term of possible complex formation.

Restricted access
Acta Veterinaria Hungarica
Authors: András Gáspárdy, Gil Ismach, Árpád Bajcsy, Gyula Veress, Szilárd Márkus, and István Komlósi

Goodling, R. C., Rogers, G. W., Cooper, J. B. and Rune, B. (2000): Heritability estimates for electrical conductivity of milk and correlations with predicted transmitting abilities for somatic cell scores. J. Dairy Sci. 83 , 71 (Abstract

Restricted access

Abstract  

Electrical conductivity and Seebeck voltage developed in -irradiated TiO2 was studied as a function of temperature. The conversion of n-type TiO2 into p-type observed after irradiation was explained on the basis of formation of inversion layer of p-type TiO2 due to the chemisorption of oxygen on the oxide surface during irradiation. Sign of the EMF of the electrochemical concentration cell of Ag/Ag+ with the addition of irradiated TiO2 was found to be exactly opposite to that due to the addition of nonirradiated oxide.

Restricted access

Abstract  

The effect of gamma-radiation on the kinetic parameters of the cation exchange reactions of Co, Ni and Cu ions on Zeolites 13X has been studied. The radiation did not modify the mechanism of the exchange reactions, but it caused a change in the rate of exchange, which is dependent upon radiation dose. The effect of γ-irradiation on the electrical conductivity of zeolites has been also investigated and discussed.

Restricted access

Electrical conductivity properties of someo-substituted arylazo-barbiturate complexes at different temperatures are studied. The σo, ΔE andE g values are determined. The copper complexes derived from −H, −CH3 and −OCH3 substituted organic compounds are with semiconducting properties at low temperatures and insulator at high temperatures. All the carboxy and the cobalt and the the nitro complexes, and nickel-methyl complexes are of semiconducting behaviour. The data are explained in the light of extrensic and lattice vibrations and the width of the forbidden energy gap properties.

Restricted access

The complexes of Zn, Cd and Hg of isatin isonicotinoyl hydrazone were prepared at two differentpHs. Their thermal studies (TG, DTG and DTA) have been made and the DC electrical conductivity of compressed powder samples as a function of temperature was investigated. The activation energies (ΔE) were calculated for the ligand and the complexes which showed that the ligand has a lower value of ΔE than the complexes. The magnitude of ΔE was found to be affected by the nature of the metal and thepH of preparation.

Restricted access

Abstract  

CrIII, MnII and UO2 II amino alcohol complexes were prepared and analyzed. The IR spectra proved that the ligation occurs via oxygen and nitrogen atoms. The nujol mull electronic absorption spectra joined with the room temperature magnetic moment values proved that the complexes are of Oh geometry. The thermal behaviour of the complexes was studied by DTA and TG techniques. The mechanism of the decomposition was suggested. The thermodynamic parameters of the decomposition were evaluated and discussed. The entropy of activation changes, S*, showed that the transition states are more ordered than the reacting complexes. The D.C. electrical conductivity measurements of Cr- and Mn-amino alcohol complexes are of semiconductor behaviour. Empirical equations were deduced for the conduction of the investigated complexes.

Restricted access