Studies of the dc and ac hopping electrical conductivity in ferroelectric Pb[(Fe[1/3]Sb[2/3])[x]Ti[y]Zr[z]]O[3]

• Autorzy: Osak A. , Piwowarczyk J.

Warianty tytułu

PL

Badania stało- i zmiennoprądowego hoppingowego przewodnictwa elektrycznego w ferroelektrycznym Pb[(Fe[1/3]Sb[2/3])[x]Ti[y]Zr[z]]O[3]

• Języki publikacji: EN

Abstrakty

EN

In the paper results of the dc and ac conductivity measurements in ferroelectric ceramics Pb[(Fe[1/3]Sb[2/3])[x]Ti[y]Zr[z]]O[3] with x + y + z = 1, x = 0.1 and y = 0.43 - 0.47 are presented. The measurements have been carried out in the temperature range 77-750 K. DC conductivity in the range low temperature obeys Mott's law [sigma](0) [tilde] exp[-(T[0]/T)[^1/4]]. The values of T[0] are the order 10[^6] K. In the high temperature range dc conductivity shows an activated temperature dependence. Ac conductivity has been measured in the range of frequency 50 Hz-100 kHz. It is shown that ac conductivity fulfills the relations [sigma]([omega]) [tilde] [omega][^S], where the power exponent depends on temperature and frequency. The values of the density of states at the Fermi level N(E[F]), the most probable Mott's hopping distance R and hopping energy W were also determined.

PL

W artykule przedstawiono wyniki pomiarów przewodnictwa zmienno- i stałoprądowego ferroelektrycznej ceramiki [Pb(Fe[1/3]Sb[2/3])[x]Ti[y]Zr[z]]O[3] gdzie x + y + z = 1, x = 0,1 i y = 0,43 -0,47. Pomiary zostały wykonane w zakresie temperatur 77-750 K. Przewodnictwo stałoprądowe w niskich temperaturach jest opisane prawem Motta [sigma](0) [tylda] exp[-(T[0]/T)[^1/4]]. Wartość T[0] jest rzędu 10[^6] K. W zakresie wysokich temperatur przewodnictwo stałoprądowe ma charakter aktywacyjny. Przewodnictwo zmiennoprądowe zostało zmierzone w zakresie od 50 Hz do 100 kHz. Przewodnictwo zmiennoprądowe jest opisane zależnością [sigma]([omega]) [tylda][omega][^S], gdzie wykładnik potęgowy jest zależny zarówno od temperatury, jak i częstotliwości. W pracy wyznaczono również wartości gęstości stanów na poziomie Fermiego N(E[F]), najbardziej prawdopodobną odległość hoppingu Motta R i energię hoppingu W.

Słowa kluczowe

EN

electrical conductivity; hopping conduction; PZT-PFS ceramics

PL

ceramika PZT-PFS; przewodnictwo elektryczne; przewodnictwo hoppingowe

• Wydawca: Wydawnictwo Politechniki Krakowskiej im. Tadeusza Kościuszki
• Czasopismo: Czasopismo Techniczne. Nauki Podstawowe
• Rocznik: 2011
• Tom: R. 108, z. 1-NP
• Strony: 59--75
• Opis fizyczny: Bibliogr. 48 poz.,Wz., tab., wykr.,

Twórcy

autor

Osak A.

autor

Piwowarczyk J.

• Wydział Fizyki, Matematyki i Informatyki Stosowanej, Politechnika Krakowska

Bibliografia

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