Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: Sr2+

Sortuj według:

Ogranicz wyniki do:

Influence of Sr2+ Dopant on Microstructure and Electric Properties of (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 (BCZT) Ceramics

Radoszewska D., Goryczka T., Adamczyk M., Wodecka-Duś B., Bochenek D., Kozielski L.

Archives of Metallurgy and Materials

2018

Vol. 63, iss. 3

1295--1302

The discovery of (BaxCa1-x)(ZryTi 1-x)O3 lead-free ceramics drawn a lot of attention to those novel materials because of their excellent piezoelectric properties. However, quite a little attention has been paid to other features of the material. This article reports a wide range of research, including composition, structure and microstructure, dielectric response and impedance spectroscopy in order to systematize and expand knowledge about this peculiar ceramics and strontium doping effect on its properties. In order to test that influence a series of samples with various strontium concentration, precisely the admixtures of 0.02, 0.04 and 0.06 mol% were prepared, as well as basic ceramics to compare obtained results.

Conductance Study of the Thermodynamics of Dibenzopyridino-18-crown-6 Complexes with K+, Ti+, Sr2+ and Ba2+ Ions in Acetonitrile Solution

Shamsipur M., Tavakkoli N.

Polish Journal of Chemistry

2004

Vol. 78 / nr 1

109-116

The complexation reactions between dibenzopyridino-18-crown-6 and Tl+, K+, Sr2+ and Ba2+ ions were studied conductometrically in acetonitrile solution at various temperatures. The formation constants of the resulting 1:1 complexes were calculated from the computer fitting of the molar conductance-mole ratio data at different temperatures. At 25°C, the stability of the resulting complexes varied in the order Ba2+ > Sr2+ > Tl+ > K+. The enthalpy and entropy changes of the complexation reactions were evaluated from the temperature dependence of formation constants. While, the bivalent alkaline earth complexes are both enthalpy and entropy stabilized, the univalent cation complexes used are enthalpy stabilized but entropy destabilized.