• Title, Summary, Keyword: Thermally stimulated depolarization current

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Thermally Stimulated Depolarization Current Test for Reliability of X5R MLCC (TSDC 방법을 이용한 X5R MLCC의 신뢰성 평가)

  • Park, Ji-Young;Park, Jae-Sung;Kim, Young-Tae;Hur, Kang-Heon
    • Journal of the Korean Ceramic Society
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    • v.46 no.2
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    • pp.155-160
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    • 2009
  • The reliability could be one of the essential properties for multilayer ceramic capacitor (MLCC) using in various electronic devices and the concentration and mobility of oxygen vacancy would play important role in the reliability. To investigate the migration behavior of oxygen vacancies, thermally stimulated depolarization current (TSDC) is adopted. In dielectric material of X5R MLCC, the TSD-Current peak observed around 150$^{\circ}C$ and 200$^{\circ}C$ which represented the migration of oxygen vacancy. Substituting Yttrium for Dysprosium in X5R MLCC showed higher migration activation energy and lower TSD current density.

Characteristics of Thermally Stimulated Measurement in Dipolar Depolarization (쌍국자 분극에 대한 열자격 특성)

  • 권영수;강도열;국상훈
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.39 no.4
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    • pp.357-363
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    • 1990
  • A thermally stimulated current measurement using a temperature gradient (TG-TSC) has been applied to the study of dipolar depolarization in polymers. It has been clarified that theoretical analysis of TG-TSC in the initial rise region corresponds with the experimental results. We conclude that the experimental results on a cross-linked polyethy-lene (XLPE) film can be explained using the above relation and that the charasteristics obtained from the above theoretical analysis can be used for ascertaining the presence of a constant temperature gradient in a film.

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Depolarization Mechanism of Alternating-current-poled Pb(Mg1/3Nb2/3)O3-PbTiO3 Single Crystals Measured using in-situ thermally Stimulated Depolarization Current (TSDC 방법을 이용한 AC 폴링된 PMN-PT 단결정의 디폴링 메커니즘 분석)

  • Lee, Geon-Ju;Kim, Hwang-Pill;Lee, Sang-Goo;Lee, Ho-Yong;Jo, Wook
    • Journal of Sensor Science and Technology
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    • v.29 no.1
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    • pp.59-62
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    • 2020
  • Currently, increasing attention is being paid to relaxor-based ferroelectric single crystals in photoacoustic images, especially for high-end applications. Among the crystals are (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-100xPT) single crystals located near their morphotropic phase boundary (x = 0.30-0.35) because of their ultrahigh piezoelectric and electromechanical coupling properties. The alternating current poling (ACP) treatment, rather than the conventional direct current poling treatment, has recently been spotlighted due to its effectiveness in enhancing the piezoelectric properties. So far, it has been suggested that the enhanced piezoelectricity originates from either a domain miniaturization to nanodomains or from an electric-field-induced monoclinic symmetry. In this study, we demonstrate by thermally stimulated depolarization current measurements that the effect of ACP is too complex to be explained using a single mechanism and that the proposed electric-field-induced monoclinic symmetry is unlikely to exist.

Study on Polarization Properties of BaTiO3by Using Thermally Stimulated Depolarization Current (열자극 탈분극전류 방법에 의한 BaTiO3의 분극 특성 연구)

  • Song, Ho-Jun;Lee, Yong-Ryeol;Park, Yeong-Joon
    • Korean Journal of Materials Research
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    • v.12 no.8
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    • pp.613-616
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    • 2002
  • The polarization properties of $BaTiO_3$ were investigated by using thermally stimulated depolarization current (TSDC) technique. Two peaks were observed at about 400 K (peak A) and 435 K (peak B) from TSDC spectra obtained from the temperature range of 280-500 K. Peak A shows a sharp decrease of TSDC due to extinction of spontaneous polarization above the phase transition temperature of $BaTiO_3$. The values of activation energy of peak A and peak B were calculated to be 0.70 eV and 0.87 eV respectively. From the results of TSDC measurement with a variation of polarizing electric field strength, we found that saturation of total current of TSDC was started from 3kV/cm. However, the amount of total current of TSDC was not affected by the variation of polarizing time.

A Study of TSDC for Li2B4O7 Single Crystal (Li2B4O7 단결정의 TSDC에 관한 연구)

  • Cha, Jong Won
    • Journal of Korean Ophthalmic Optics Society
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    • v.3 no.1
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    • pp.269-277
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    • 1998
  • The TSDC(Thermally Stimulated Depolarization Current) measurement were carried out in the temperature range $30{\sim}500^{\circ}C$. We observed the anomalous two peaks that have a thousand times longer relaxation time than that of the space charge. It seems that the origin of the two peak are due to the electron trapping effect and to the adsorption of the vacancies at silver electrode.

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Characteristics of Thermally Stimulated Current in the ZnO varister (ZnO 바리스터의 TSC 특성)

  • 안용모;이성일;이상석;박춘배;이준용
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.101-104
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    • 1989
  • Thermal Electet of the Zinc Oxide varistor has been studied in the temperature range of -130~200[$^{\circ}C$] and the electric field of 6[kV/m]. It appears that there are four peaks of thermally stimulated current; $\alpha$, $\beta$, ${\gamma}$ and $\delta$ spectra appearing at the temperature range of 160, 130, 20 and -30[$^{\circ}C$], respectively. It seems that the origin of $\alpha$, $\beta$, ${\gamma}$ and $\delta$ peaks are associated with the depolarization of donor ions in the depletion layer, the detrapping of trapped electron in the surface, the detrapping of trapped electron in the donor level and the detrapping of trapped electron between grain and intergranular, respectively.

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Polarity of Charged Particles n XLPE Measured by Temperature Gradient Thermally Stimulated Surface Potential (온도 구배열자극측정법의한 XLPE하전입자의 극성판정)

  • Kook, Sang-Hoon
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.34 no.4
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    • pp.144-152
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    • 1985
  • This paper temperature gradient thermally stimulated surface potentian (TG-TSSP) in measurements are applied to the study of the polarity of trapped and ionic carriers in cross-linked polyethylene (XLPE) filsm. In the thermally stimulated current in uniform temperature (TSC) of XLPE five peaks appear as indicated of the A B C D and E. In this paper A (at about -120$^{\circ}C$) D (at about 70$^{\circ}C$) and E (at about 110$^{\circ}C$) peaks are investigated. A peak is due to the biassing voltage and biassing temperature. Appear in to the glass transition temperature territory and caused in to the polarization of dipole. D peak is due to the depolarization of ionic space charge and E peak due to the detrapping of carriers injected from the electrodes. TG-TSSP and TSSP are measured to study the polarity of ionic carrier (D peak). In the unsatureated region of ionic space charge polarization, TG-TSSP is lower than TSSP during the initial stage of heating. Result of the experiment for E peak, TG-TSSP is higher than TSSP during the initial stage of heating and these results do not depend on the polarity of biassing voltage, and E peak is concerned with positive carriers (Holes).

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Thermally Simulated Current of Corona-Charged PVDF Film (코로나 대전된 PVDF 필름의 열자격 전류)

  • Kim, C.H.;Kim, G.Y.;Hong, J.W.;Lee, J.U.
    • Proceedings of the KIEE Conference
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    • pp.489-491
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    • 1987
  • It has been shown that the thermally stimulated current technique can be one of the most powerful methods for evaluating the electrical properties. An unstretched $\alpha$-form specimen of corona-charged, 50[${\mu}m$],t Polyvinylidene Fluoride shows four TSC peaks designated $\delta}$, $\gamma$, $\beta$ and $\alpha$ in assending order of temperature in temperature range $-100{\sim}200^{\circ}C$. The $\delta$, $\gamma$ peaks may be attributed to the dipolar depolarization in the amorphous regions and $\beta$, $\alpha$ peaks are associated with the detrap from trapped carriers in the crystalline regions.

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The Effect of $SiO_2$ Affect to Thermally Stimulated Current of Insulating Silicone Rubbers (절연용 실리콘 고무의 열자격 전류에 미치는 $SiO_2$의 영향)

  • 이성일
    • Journal of the Korean Society of Safety
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    • v.11 no.2
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    • pp.60-66
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    • 1996
  • In order to look into the internal structure and electrical properties of insulating Silicone rubbers added reinforcing fillers ; Silica(0-140 phr ), and to examine the behavior of charged particles, and the properties of thermally stimulated current (TSC) are investigated, respectively. From the TSC which are formed by applying the electric field of 2~5 ㎸/mm to specimen at temperature range from -150 to $270^{\circ}C$, the results arp as following. In the case of non-filled specimen, four peaks of $\delta$, $\gamma$ , $\beta$ and u are obtained at the temperature of $-120^{\circ}C$, $-60^{\circ}C$, $20^{\circ}C$ and $130^{\circ}C$, respectively and the case of filled specimen, three peaks of $\delta$, ${\alpha}_2$ and ${\alpha}_1$ are observed at the temperature of of $-120^{\circ}C$, $80^{\circ}C$ and $130^{\circ}C$, respectively. The origins of these peaks are that, the $\delta$ peak seems to the result from the contribution of side chain methyl radical, and the $\beta$ peak from the depolarization of space charge polarization owing to added imputity during during manufacturing specimens, and the $\beta$ peak from the orientation of $Si-CH_3$dipole, and the ${\alpha}_2$ near the temperature of $130^{\circ}C$ from carboxyl acid that is formed by the thermal oxidation of high temperature.

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A study on the Electrical Properties of Polypropylene Film (폴리플로필렌 박막의 전기적 특성에 관한 연구)

  • Lee, Joon-Ung;Kim, Wang-Kon;Kim, Bong-Heup
    • Elastomers and Composites
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    • v.21 no.2
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    • pp.121-128
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    • 1986
  • Studies has been carried out on the characteristics of thermally stimulated current for polypropylene in the temperature range of $293[^{\circ}K]{\sim}403[^{\circ}K]$. The main peak observed at $366[^{\circ}K]$, as may be $\beta$ peak in conventional nomination, is believed to be depolarization current originated from the relaxation of "CO" group in monomer structure. The activation energy for the observed peak has been concluded to be in the range of $0.6{\sim}0.7[(eV]$ at $360[^{\circ}K]$ by the initial rise method. Furthermore, the initial density of carriers were calculated about $10^{22}/m^3$

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