Ni-Mn熱敏電阻製備條件對電特性的影響

本研究是以具有尖晶石結構之(Mn,Ni)3O4氧化物陶瓷體為研究對象，其電阻會隨著溫度上升而急速下降, 此特性被運用於負溫度係數(Nagative Temperature Coefficience,NTC)熱敏電阻元件。本實驗是利用化學共沈法，藉由改變燒結溫度，並且在不同氣氛下，探討其對NTC各物理特性的影響。 Ni0.8Mn2.2O4在1200℃氮氣燒結和氬氣燒結時，其活化能分別為3963.84 、3945.436 比空氣燒結為3853.357 、氧氣燒結為3740.487 的B值較高。所以在惰性氣體燒結時，電子跳躍所需的活化能高，電阻值高，導電率低。在氧氣氣氛燒結時，則可降低電阻值，電子跳躍所需的的活化能低，導電率高。Ni0.8Mn2.2O4在1200℃空氣氣氛燒結時，ΔR/R隨時效時間增長變化不大，有最佳的穩定性（ΔR/R=0.07％、0.12％、0.09％）。 Ni0.66Mn2.34O4和Ni0.8Mn2.2O4在氮氣和氬氣燒結氣氛下，則有NiO析出，並隨著燒結溫度增加，會造成電阻率的大幅上升。但在氧化氣氛燒結可以消除NiO二次相的析出，而有完整的尖晶石結構。

關鍵字

熱敏電阻、尖晶石、負溫度係數、化學共沈法

並列摘要

In this study, the (Mn,Ni)3O4 spinel ceramics were investigated as NTC elements. The temperature depending properties, such as resistance and the coefficient of temperature were examined. The experiment were conducted to utilize coprecipitation to prepare the precursor powder by several combination of sintering process with various temperatures and atmospheres to study the variation following of physical properties. The activation of Ni0.8Mn2.2O4 sintering at 1200℃ in nitrogen and argon is 3963.84 and 3945.436 respectively which is higher than those sintering in air (3853.357 ) and in oxygen (3740.487 ). When the samples were under the inert gas sintering, the electron jump activation and resistance were high. When the samples were under the oxygen atmosphere sintering, the resistance was decrease and electron jump activation was low. The ΔR/R of Ni0.8Mn2.2O4 increased with age time and the best resistivity stability is sintering at 1200℃ in air(ΔR/R =0.07% , 0.12% , 0.09%). When Ni0.66Mn2.34O4 and Ni0.8Mn2.2O4 sintered in nitrogen and argon, the resistivity of the samples became higher with the segregation of NiO. The samples sintered in oxygen atmosphere could avoid the segregation of NiO and the single phase with spinel structure is obtained.

並列關鍵字

Coprecipitation ； Negative Temperature Coefficient ； spinel ； Thermistor

參考文獻

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國際替代計量

Ni-Mn熱敏電阻製備條件對電特性的影響

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