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Effect of CuO Addition on the Microstructural and Electrical Properties of Ni-Mn Oxide NTC Thermistor

Ni-Mn 산화물 NTC 서미스터의 미세구조와 전기적 특성에 미치는 CuO 첨가의 효과

Kim, Kyeong-Min;Lee, Sung-Gap;Lee, Dong-Jin;Park, Mi-Ri
김경민;이성갑;이동진;박미리

  • Received : 2016.03.21
  • Accepted : 2016.05.24
  • Published : 2016.06.01

Abstract

In this study, $ Ni_{0.79}(Mn_{2.21-x}Cu_x)O_4$ (x=0~0.25) specimens were prepared by using a conventional mixed oxide method. All specimens were sintered in air at $1,200^{\circ}C$ for 12 h and cooled at a rate of $2^{\circ}C/min$ to $800^{\circ}C$, subsequently quenching to room temperature. We investigated the structural and electrical properties of $ Ni_{0.79}(Mn_{2.21-x}Cu_x)O_4$ specimens with variation of CuO amount for the application of NTC thermistors. As results of X-ray diffraction patterns, all specimens showed the formation of a complete solid solution with cubic spinel phase. The relationship between ln ${\rho}$ and the reciprocal of absolute temperature(1/T) for the NTC thermistors was shown linearity, which exhibited the typical NTC thermistor properties. With increasing the amount of CuO, resistivity at room temperature, B-value, and temperature coefficient resistance decreased.

Keywords

Negative temperature coefficient;Ni-Mn-Cu oxide;Electrical resistivity;Mixed-oxide method

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Acknowledgement

Grant : 액상공정을 이용한 열변화형 세라믹 박막 및 저온 진공 게터 기술 개발

Supported by : 산업통상자원부