Critical behaviour of dark current and spontaneous polarization in ferroelectric SbSI

Chaves, Renata; Amaral, Maria Helena; Ziółkiewicz, S.

doi:10.1051/jphys:01980004103025900

Cited by 33 publications

(11 citation statements)

References 16 publications

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“…The temperature dependance of the pyroelectric coefficient in SbSI and in BiO.08SbO.92SI is very sharp near Tc' which is typical of a first order transition, but the results concerning spontaneous polarization are rather inconclusive as to the order of the transition. Measurements of temperature dependance of dark 10 As SbSI has an anomalous high value for the temperature d · . and c coefficients.…”

Section: Resultsmentioning

confidence: 99%

Pyroelectric Effect and Ferroelectric Phase Transition in BixSb1-xSI

Chaves¹,

Amaral²,

Ziółkiewicz

et al. 1981

Recent Developments in Condensed Matter Physics

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The measurements of pyroelectric current in needle shaped crystals of Bi Sb l SI (x = 0; 0.08; 0.17; 0.25; 0.50) were carried out byx -x measuring the potential difference across a short-circuiting resistance, while heating the samples at uniform rates. Critical temperature T follows a rapid linear decrease when x increases c up to 0.50, with a slope of 36 K per 0.10 Bi concentration.Critical exponent S of polarization, deduced from measurements of pyroelectric current, were obtained by using a T -independant c method and generally these values seem consistent with a mean field theory. It is found that a tricritical point, where the phase transition changes from first to second order, occur at a value of x around 0.17. The appearance of a pyroelectric current above T , for those crystals which undergo a second order phase transition, c can be explained by existence of an internal bias field. 43 J. T. Devreese et al. (eds.), Recent Developments in Condensed Matter Physics © Plenum Press, New York 1981 44 M. RENATA CHAVES ET AL.

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Section: Resultsmentioning

confidence: 99%

Pyroelectric Effect and Ferroelectric Phase Transition in BixSb1-xSI

Chaves¹,

Amaral²,

Ziółkiewicz

et al. 1981

Recent Developments in Condensed Matter Physics

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“…Dielectric response was measured using an Agilent E4980A LCR meter in the frequency range of 20 Hz to 2 MHz with an a.c. measuring voltage of 50 mV. Thermally stimulated depolarization current was measured with a standard short circuit method as a function of temperature [19]. Electric polarization (P) versus an a.c. electric field (E) curves were determined using a modified Sawyer-Tower circuit [20] driven at a frequency of 1.3 Hz.…”

Section: Methodsmentioning

confidence: 99%

Tackling Polar Response in Oxygen Deficient KTaO₃Thin Films

et al. 2014

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Oxygen deficient KTaO 3 thin films were grown by RF magnetron sputtering onSi/SiO 2 /Ti/Pt substrates. Room temperature X-ray diffraction shows that they are under a compressive strain of 2.3%. Leakage current results reveal the presence of a conductive mechanism, following Poole-Frenkel formalism. The existence of a polar response below T pol ∼ 367 • C was ascertained by dielectric, polarization, and depolarization current measurements. A Cole-Cole dipolar relaxation was evidenced which is associated with oxygen vacancies induced dipoles. After annealing the films in an oxygen atmosphere above T pol , the aforementioned polar response is suppressed, due to significant oxygen vacancies reduction.

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“…The pressed disks were sintered between 1240 • C and 1400 • C for two hours in air and then furnace-cooled [2]. Experimental details on pyroelectric measurements and Raman spectroscopy can be seen elsewhere [4,5]. Figure 1 shows the unpolarised Raman spectra for the nominally pure STO ceramic and for x = 0.0533, 0.080 and 0.133 SLaTO ceramics, in the frequency range 5-1000 cm −1 , at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Lattice Dynamics and Negative Search for Pyroelectricity in Sr_{(1 − 1.5x)}La_xTiO₃Ceramics

et al. 2005

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Lattice dynamics and polar properties in lanthanum doped SrTiO 3 (STO) ceramics, with general formulae Sr (1−1.5x) La x TiO 3 were studied in the temperature range between 10 K and room temperature. Despite the similarities of the low frequency Raman spectra, for differently (x = 0.0533, 0.080 and 0.133) La-doped ceramics, and the spectra of the undoped ceramics, the TO 1 polar soft mode could not be detected in those systems, which confirms the non-existence of a ferroelectric phase at low temperatures. Raman spectra analysis provides evidence for drastic effects determined by La 3+ impurity in the critical temperature shift of the para-antiferrodistortive phase transition of STO, accompanied with a continuing change of the lattice dynamics by increasing lanthanum concentration. The absence of a pyroelectric current confirms the non-existence of a polar character in the low temperature range. The existence of semiconduting like behaviour at high temperatures was disclosed.

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Critical behaviour of dark current and spontaneous polarization in ferroelectric SbSI

Cited by 33 publications

References 16 publications

Pyroelectric Effect and Ferroelectric Phase Transition in BixSb1-xSI

Pyroelectric Effect and Ferroelectric Phase Transition in BixSb1-xSI

Tackling Polar Response in Oxygen Deficient KTaO₃Thin Films

Lattice Dynamics and Negative Search for Pyroelectricity in Sr_{(1 − 1.5x)}La_xTiO₃Ceramics

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Critical behaviour of dark current and spontaneous polarization in ferroelectric SbSI

Cited by 33 publications

References 16 publications

Pyroelectric Effect and Ferroelectric Phase Transition in BixSb1-xSI

Pyroelectric Effect and Ferroelectric Phase Transition in BixSb1-xSI

Tackling Polar Response in Oxygen Deficient KTaO3Thin Films

Lattice Dynamics and Negative Search for Pyroelectricity in Sr(1 − 1.5x)LaxTiO3Ceramics

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Tackling Polar Response in Oxygen Deficient KTaO₃Thin Films

Lattice Dynamics and Negative Search for Pyroelectricity in Sr_{(1 − 1.5x)}La_xTiO₃Ceramics