Wydział Nauk Ścisłych i Przyrodniczych (WMFT): Recent submissions
Wyświetlanie pozycji 461-480 z 944
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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 ... -
Nauczanie techniki w RFN
(1988)