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Wyszukujesz frazę "barium titanate" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Influence of Sn and Pb Ions Substitutions on Dielectric Properties of Barium Titanate
Autorzy:
Bąk, W.
Kajtoch, C.
Ptaszek, S.
Lisińska-Czekaj, A.
Czekaj, D.
Ziętek, D.
Glos, T.
Garbarz-Glos, B.
Powiązania:
https://bibliotekanauki.pl/articles/352509.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
barium titanate ceramics
dielectric properties
phase transition
Opis:
The results of the microstructural and dielectric measurements of (Ba1-xPbx)(Ti1-xSnx)O3 (BPTSx) (x = 0, 0.05, 0.10, 0.30) polycrystalline samples are presented. The samples were obtained by means of a high temperature synthesis and their expected stoichiometry was confirmed by energy dispersive spectroscopy (EDS) measurements. The dielectric properties of BPTSx were studied with the use of broadband dielectric spectroscopy. The measurements over a wide range of temperature (from 140 K to 600 K) and frequency (from 0.1 Hz to 10 MHz) were performed. The experimental results indicate an influence of Pb ions in a sublattice A and Sn ions in a sublattice B substitution on paraelectric - ferroelectric phase transition parameters. Diffused phase transitions from a paraelectric to ferroelectric state (for x = 0.10 and x = 0.30) were observed. From the electric modulus measurements in the frequency domain the relaxation times and the activation energy were determined.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 905-908
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Semiconductor Element Substitution on the Electric Properties of Barium Titanate Ceramics
Autorzy:
Garbarz-Glos, B.
Lisińska-Czekaj, A.
Czekaj, D.
Bąk, W.
Powiązania:
https://bibliotekanauki.pl/articles/354672.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
barium titanate
ceramics
dielectric permittivity
electric conductivity
phase transitions
PTCR effect
Opis:
The investigated ceramics were prepared by a solid-state reaction from simple oxides and carbonates with the use of a mixed oxide method (MOM). The morphology of BaTi0.96Si0.04O3 (BTSi04) ceramics was characterised by means of a scanning electron microscopy (SEM). It was found that Si+4 ion substitution supported the grain growth process in BT-based ceramics. The EDS results confirmed the high purity and expected quantitative composition of the synthesized material. The dielectric properties of the ceramics were also determined within the temperature range (ΔT=130-500K). It was found that the substitution of Si+4 ions had a significant influence on temperature behavior of the real (ε’) and imaginary (ε”) parts of electric permittivity as well as the temperature dependence of a.c. conductivity. Temperature regions of PTCR effect (positive temperature coefficient of resistivity) were determined for BTSi04 ceramics in the vicinity of structural phase transitions typical for barium titanate. No distinct maximum indicating a low-temperature structural transition to a rhombohedral phase in BTSi04 was found. The activation energy of conductivity was determined from the Arrhenius plots. It was found that substitution of Si ions in amount of 4wt.% caused almost 50% decrease in an activation energy value.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 887-890
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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