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

Abstract

A decrease in electrical resistance with increasing temperature is the characteristic feature

of NTC thermistor utilized as temperature sensors in industrial applications. Nickel manganite is used

as one of the main compositions for application of NTC thermistors. The electrical properties of

nickel 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 on

the electrical and microstructure properties of nickel manganite based NTC thermistors were

investigated. For this purpose, Ni0.5 Co0.5CuxMn2-xO4 (x=0.15 and 0.30) samples were prepared by

conventional ceramic processing techniques. The samples were sintered at 1300 ˚C for 5 hours. The

addition of CuO plays an important role by increasing the bulk density, improving the microstructure

properties and enhancing the electrical characteristics of NTC thermistors. It was determined that

the 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 electrical

resistivity and material constant decreased with increasing CuO content. The electrical resistivity and

material constant of Ni0.5Co0.5Cu0.3Mn1.7O4 sample were calculated as 61 Ω.cm and 3124 K.

Keywords

• Copper oxide
• Electrical properties
• NTC thermistor

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

Öz

Endüstriyel uygulamalarda sıcaklık sensörü olarak kullanılan NTC termistörün karakteristik

özelliği, sıcaklığın artmasıyla elektriksel direncinin azalmasıdır. Nikel manganit, NTC termistörler

uygulamalarında ana kompozisyonlardan biri olarak kullanılmaktadır. Nikel manganit esaslı NTC

termistörlerin elektriksel özellikleri, kobalt oksit, demir oksit, krom oksit ve bakır oksit gibi katkı

maddelerinin ilavesiyle değiştirilir. Bu çalışmada bakır oksit katkısının nikel manganit esaslı NTC

termistörlerin 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 kullanılarak

üretilmiştir. Numuneler 1300 ˚C'de 5 saat sinterlenmiştir. Numunelerin göreceli yığın yoğunluklarının

yaklaşık % 97 olduğu belirlenmiştir. Ni0.5 Co0.5 Cu0.15Mn1.85 O4 numunesi için elektriksel özdirenç (ρ) ve

malzeme sabiti ( B) sırasıyla 286 Ω.cm ve 3355 K olarak bulunmuştur. CuO katkı miktarının

artırılmasıyla ise elektriksel özdirenç ve malzeme sabiti değerlerinin azaldığı saptanmıştır. Ni0.5 Co0.5

Cu0.3Mn1.7 O4 kompozisyonuna ait 1300 ˚C’de sinterlenen numunenin elektriksel özdirenç ve malzeme

sabiti değerlerinin 61 Ω.cm ve 3124 K olduğu bulunmuştur.

Anahtar Kelimeler

• Bakır oksit
• Elektriksel özellikler
• NTC termistör

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