Wydział Nauk Ścisłych i Przyrodniczych (WMFT): Recent submissions
Now showing items 441-460 of 932
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Electric properties of polycrystalline $PbCd_{1/3}Ta_{2/3}O_3$
(1999)The temperature dependence of linear expansion, electric permittivity and electric conductivity has been investigated in the region of the diffuse phase transition. The electric properties of polycrystalline $PbСd_{1/3 ... -
Electrical properties of $Na_{0.98}Li_{0.02}NbO_3$ under axial pressure in phase transition region
(2003)The measurements of electric properties of $Na_{0.98}Li_{0.02}NbO_3$ ceramics for stress-free or samples under stress have been carried out. It was found that incorporation of Li-cations (2% mol) in antiferroelectric ... -
Investigation of dielectric properties of $Li_xNa_{1−x}NbO_3$ ceramics for x = 1 and x = 4
(1999)The a.c. electrical response of $Li_xNa_{1−x}NbO_3$ (LNN) solid solution in low frequency range (100 Hz–20 kHz) has been analysed as a function of temperature (300 K–750 K). A complex picture of the dependence of the ... -
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 ...