Artykuły naukowe (WMFT): Recent submissions
Wyświetlanie pozycji 401-420 z 759
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The frequency measurements of dielectric properties in the phase transition range in the $Li_{0.02}Na_{0.98}NbO_3$
(1999)Measurement of the temperature, time and frequency changes of dielectric permittivity and dielectric loss in polycrystalline $Li_{0.02}Na_{0.98}NbO_3$ have been carried out. The dielectric permittivity ε has been measured ... -
Dielectric properties of $Li_{0.003}Na_{0.997}NbO_3$ ceramics
(1998)Temperature, frequency and time dependencies of dielectric permittivity and pyroelectric current of $Li_{0.003}Na_{0.997}NbO_3$ ceramics have been presented. Investigation of the pyroeffect reveals the existence of the ... -
Temperature and time changes electric permittivity in sodium niobate
(1997)Temperature and time dependencies of electric permittivity of sodium niobate have been measured. The dispersion and time changes of electric permittivity for $NaNbO_3$ ceramic has been observed. Results of this investigations ... -
Transport phenomena in solid solutions of $Li_xNa_{1-x}NbO_3$
(1993)Przeprowadzono pomiary zależności temperaturowej przewodności właściwej (σ) i współczynnika Seebecka (α) dla polikrystalicznych próbek roztworów stałych $Li_xNa_{1-x}NbO_3$, gdzie x =0.0005, 0.02, w zakresie temperatur 570 ... -
Very low frequency study on transport and relaxation phenomena in $LiNbO_3$ single crystal
(1992)The immitance spectroscopy method in very low frequency range (0.001Hz - 0.8Hz) has been applied to the cleaved single crystal of $LiNbO_3$. The results of measurements has been treated using complex plane analysis techniques. ... -
Polaronic transport in $NaNbO_3$
(1992)Measurements of the temperature dependence of the dc conductivity and the Seebeck coefficient were performed for polycrystalline samples of stoichiometric sodium niobate. The measurements were made in the temperature range ... -
Phase transitions in $Li_xNa_{1-x}NbO_3$ solid solution for 0<x<0.1
(1991)Phase transitions in solid solution $Li_xNa_{1-x}O_3$ have been investigated. Results indicate the strong relation of the parameters of the lower temperature phase transitions on the oxygen vacancies resulting from annealing ... -
Antiferroelectric-paraelectric phase transformation in nonstoichiometrc $NaNbO_3$
(1988)Admittance of polycrystalline sodium niobate synthetized with nonstoichiometric proportion of the constituent oxides has been investigated at elevated temperatures. Basic values characterizing the AFE-PE phase transformation ... -
Temperature changes of the Seebeck coefficient for nonstoichiometrc $NaNbO_3$
(1988)Dla niestechiometrycznej ceramiki niobianu sodu zbadano temperaturową zależność współczynnika Seebecka i określono typ przewodnictwa elektrycznego. Stwierdzono, że wartość współczynnika Seebecka zależy od stopnia ... -
Low frequency admittance measurements of polycrystalline sodium niobate
(1988)Complex admittance measurements for the polycrystalline sample of sodium niobate with nonstoichiometric composition has been carried out at very low frequencies with the help of direct phase-amplitude method. Results ... -
Temperature dependence of dielectric properties of nonstoichiometric $NaNbO_3$
(1988)Systematic studies of the dependence of dielectric and semiconducting properties on the deviation from stoichiometry have been undertaken. A complex picture of the dependence of studied properties on the chemical ...