ZnO 바리스터는 여러 가지 長點이 있지만 高電壓에 사용할때에 漏泄電流와 粒子의 크기에 따른 비선형계수에 의해 動作特性이 불안정하여 문제가 되고 있다. 이러한 ZnO 바리스터의 特性을 개선하기 위하여 Y₂O₃를 添加하여 燒結條件과 配合比를 달리한 高電壓 ZnO 바리스터를 제작하여 電氣的 特性을 硏究하였다. 제작된 高電壓 바리스터의 構造的, 電氣的特性은 表面 微細構造, 結晶相 構造, 周波數 變化에 의한 誘電特性, 電流-電壓特性, 靜電容量-電壓特性, 漏泄電流 特性 등을 考察하였다. Y₂O₃添加量이 증가함에 따라 ...
ZnO 바리스터는 여러 가지 長點이 있지만 高電壓에 사용할때에 漏泄電流와 粒子의 크기에 따른 비선형계수에 의해 動作特性이 불안정하여 문제가 되고 있다. 이러한 ZnO 바리스터의 特性을 개선하기 위하여 Y₂O₃를 添加하여 燒結條件과 配合比를 달리한 高電壓 ZnO 바리스터를 제작하여 電氣的 特性을 硏究하였다. 제작된 高電壓 바리스터의 構造的, 電氣的特性은 表面 微細構造, 結晶相 構造, 周波數 變化에 의한 誘電特性, 電流-電壓特性, 靜電容量-電壓特性, 漏泄電流 特性 등을 考察하였다. Y₂O₃添加量이 증가함에 따라 Spinel상의 분포는 감소하였고 ZnO결정입이 증가하였으며 크기는 92∼51[㎛]범위로 감소하였다. 또한 燒結溫度의 증가에 따른 ZnO결정입의 成長이 觀察되었다. 結晶相 分析에서도 Spinel상이 존재하지 않았으며 모든시료에서 정방정상을 나타내는 피크의 배향성이 우수하였다. Y₂O₃添加量 4.0[mol%]일 경우 結晶粒 크기의 감소로 바리스터 電壓은 528∼1140[V/㎠]범위로 증가하고 비선형 계수는 2.2∼3.1 범위로 크게 저하되었다. 周波數 變化에 의한 誘電率은 周波數가 증가함에 따라 誘電率이 감소되는 유전분산경향을 보였다. 또한, 誘電體損은 100∼200[kHz]이하에서는 급격히 증가하였으나 周波數가 증가하면서 誘電體損이 안정한 特性을 보였다. 靜電容量-電壓特性은 입계당 電壓이 증가함에 따라 업계의 단위면적당 靜電容量은 감소하였다. 燒結溫度가 동일하고 燒結時間이 증가함에 따라 漏泄電流는 증가하였다.
ZnO 바리스터는 여러 가지 長點이 있지만 高電壓에 사용할때에 漏泄電流와 粒子의 크기에 따른 비선형계수에 의해 動作特性이 불안정하여 문제가 되고 있다. 이러한 ZnO 바리스터의 特性을 개선하기 위하여 Y₂O₃를 添加하여 燒結條件과 配合比를 달리한 高電壓 ZnO 바리스터를 제작하여 電氣的 特性을 硏究하였다. 제작된 高電壓 바리스터의 構造的, 電氣的特性은 表面 微細構造, 結晶相 構造, 周波數 變化에 의한 誘電特性, 電流-電壓特性, 靜電容量-電壓特性, 漏泄電流 特性 등을 考察하였다. Y₂O₃添加量이 증가함에 따라 Spinel상의 분포는 감소하였고 ZnO결정입이 증가하였으며 크기는 92∼51[㎛]범위로 감소하였다. 또한 燒結溫度의 증가에 따른 ZnO결정입의 成長이 觀察되었다. 結晶相 分析에서도 Spinel상이 존재하지 않았으며 모든시료에서 정방정상을 나타내는 피크의 배향성이 우수하였다. Y₂O₃添加量 4.0[mol%]일 경우 結晶粒 크기의 감소로 바리스터 電壓은 528∼1140[V/㎠]범위로 증가하고 비선형 계수는 2.2∼3.1 범위로 크게 저하되었다. 周波數 變化에 의한 誘電率은 周波數가 증가함에 따라 誘電率이 감소되는 유전분산경향을 보였다. 또한, 誘電體損은 100∼200[kHz]이하에서는 급격히 증가하였으나 周波數가 증가하면서 誘電體損이 안정한 特性을 보였다. 靜電容量-電壓特性은 입계당 電壓이 증가함에 따라 업계의 단위면적당 靜電容量은 감소하였다. 燒結溫度가 동일하고 燒結時間이 증가함에 따라 漏泄電流는 증가하였다.
Zn0 varistor has many good merits. But when it is used at high voltage, it's operation properties were unstable because of leakage current and nonlinear coefficient with grain size. For the purpose of improving of Zn0 varistor properties, high voltage Zn0 varistor was fabricated with Y₂O₃ addition. ...
Zn0 varistor has many good merits. But when it is used at high voltage, it's operation properties were unstable because of leakage current and nonlinear coefficient with grain size. For the purpose of improving of Zn0 varistor properties, high voltage Zn0 varistor was fabricated with Y₂O₃ addition. Electrical properties were investigated according to sintering conditions and mixing conditions. Structure and electrical properties were studied by SEM, XRD, dielectric properties, I-V properties, C-V properties and leakage current properties. According as Y₂O₃ mol ratio was increased, spinel phase was decreased And Zn0 grain number were increased, grain size was decreased(92-51[㎛]). As sintering temperature was prolonged, Zn0 grain size was grown. Spinel phase wasn't shown in XRD analysis. All specimens were presented tetragonal phase, good peak phase. In specimen with 4.0[mol%] Y₂O₃ addition, grain size was decreased, varistor voltage was 528-1140[V/㎠], nonlinear coefficient was 2.2 - 3.1. Because of increasing frequency, relative permittivity was decreased. Dielectric loss was increased rapidly below 200[kHz] but it was shown stable properties over 200[kHz]. Dielectric capacitance per unit area was decreased with voltage per grain boundary. And leakage current was increased according to increasing sintering temperature.
Zn0 varistor has many good merits. But when it is used at high voltage, it's operation properties were unstable because of leakage current and nonlinear coefficient with grain size. For the purpose of improving of Zn0 varistor properties, high voltage Zn0 varistor was fabricated with Y₂O₃ addition. Electrical properties were investigated according to sintering conditions and mixing conditions. Structure and electrical properties were studied by SEM, XRD, dielectric properties, I-V properties, C-V properties and leakage current properties. According as Y₂O₃ mol ratio was increased, spinel phase was decreased And Zn0 grain number were increased, grain size was decreased(92-51[㎛]). As sintering temperature was prolonged, Zn0 grain size was grown. Spinel phase wasn't shown in XRD analysis. All specimens were presented tetragonal phase, good peak phase. In specimen with 4.0[mol%] Y₂O₃ addition, grain size was decreased, varistor voltage was 528-1140[V/㎠], nonlinear coefficient was 2.2 - 3.1. Because of increasing frequency, relative permittivity was decreased. Dielectric loss was increased rapidly below 200[kHz] but it was shown stable properties over 200[kHz]. Dielectric capacitance per unit area was decreased with voltage per grain boundary. And leakage current was increased according to increasing sintering temperature.
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