NİKEL MANGANİT ESASLI NTC TERMİSTÖRLERİN ELEKTRİKSEL ÖZELLİKLERİNE 0.15 VE 0.30 MOL CuO KATKISININ ETKİSİ

Endüstriyel uygulamalarda sıcaklık sensörü olarak kullanılan NTC termistörün karakteristiközelliği, sıcaklığın artmasıyla elektriksel direncinin azalmasıdır. Nikel manganit, NTC termistörleruygulamalarında ana kompozisyonlardan biri olarak kullanılmaktadır. Nikel manganit esaslı NTCtermistörlerin elektriksel özellikleri, kobalt oksit, demir oksit, krom oksit ve bakır oksit gibi katkımaddelerinin ilavesiyle değiştirilir. Bu çalışmada bakır oksit katkısının nikel manganit esaslı NTCtermistörlerin elektriksel ve mikroyapı özelliklerine etkisi araştırılmıştır. Bu amaçla Ni0.5 Co0.5 CuxMn2-xO4 (x=0.15 ve 0.30) stokiometrisine uygun numuneler klasik seramik üretim yöntemi kullanılaraküretilmiştir. Numuneler 1300 ˚C'de 5 saat sinterlenmiştir. Numunelerin göreceli yığın yoğunluklarınınyaklaşık % 97 olduğu belirlenmiştir. Ni0.5 Co0.5 Cu0.15Mn1.85 O4 numunesi için elektriksel özdirenç (ρ) vemalzeme sabiti ( B) sırasıyla 286 Ω.cm ve 3355 K olarak bulunmuştur. CuO katkı miktarınınartırılmasıyla ise elektriksel özdirenç ve malzeme sabiti değerlerinin azaldığı saptanmıştır. Ni0.5 Co0.5Cu0.3Mn1.7 O4 kompozisyonuna ait 1300 ˚C’de sinterlenen numunenin elektriksel özdirenç ve malzemesabiti değerlerinin 61 Ω.cm ve 3124 K olduğu bulunmuştur.

Anahtar Kelimeler:

Bakır oksit, Elektriksel özellikler, NTC termistör

The Effect of 0.15 and 0.30 mol CuO Additions on the Electrical Properties of Nickel Manganite-based NTC Thermistors

A decrease in electrical resistance with increasing temperature is the characteristic featureof NTC thermistor utilized as temperature sensors in industrial applications. Nickel manganite is usedas one of the main compositions for application of NTC thermistors. The electrical properties ofnickel manganite based NTC thermistors are altered by the addition of additives such as cobalt oxide,iron oxide, chromium oxide and copper oxide etc. In this study; the effect of copper oxide addition onthe electrical and microstructure properties of nickel manganite based NTC thermistors wereinvestigated. For this purpose, Ni0.5 Co0.5CuxMn2-xO4 (x=0.15 and 0.30) samples were prepared byconventional ceramic processing techniques. The samples were sintered at 1300 ˚C for 5 hours. Theaddition of CuO plays an important role by increasing the bulk density, improving the microstructureproperties and enhancing the electrical characteristics of NTC thermistors. It was determined thatthe relative bulk density of samples was ~97 %. The electrical resistivity (ρ) and material constant ( B )of Ni0.5 Co0.5 Cu0.15Mn1.85O4 sample were determined as 286 Ω.cm and 3355 K. The values of electricalresistivity and material constant decreased with increasing CuO content. The electrical resistivity andmaterial constant of Ni0.5Co0.5Cu0.3Mn1.7O4 sample were calculated as 61 Ω.cm and 3124 K.

Keywords:

Copper oxide, Electrical properties, NTC thermistor,

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