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

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 CuxMn2xO4 (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. Nimalzeme sabiti ( B ) sırasıyla 286 ?.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 ?.cm ve 3124 K olduğu bulunmuştur.

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 temperatureis the characteristic featureof NTC thermistor utilized as temperature sensors in industrial applications.Nickelmanganiteisusedasoneofthemaincompositionsforapplication ofNTCthermistors.The electrical propertiesof nickel manganite based NTC thermistors are altered by the addition of additives such as cobalt oxide, iron oxide, chromium oxide and copper oxide etc. Inthisstudy;theeffectofcopperoxideadditionontheelectricalandmicrostructurepropertiesofnickelmanganitebasedNTCthermistorswereinvestigated.Forthispurpose,Ni0.5Co0.5CuxMn2-xO4(x=0.15and0.30)sampleswerepreparedbyconventionalceramicprocessingtechniques.Thesamplesweresinteredat1300 ?Cfor5hours.TheadditionofCuOplaysanimportantrolebyincreasingthebulkdensity,improvingthemicrostructurepropertiesandenhancingtheelectricalcharacteristicsofNTCthermistors.Itwasdeterminedthattherelativebulkdensityofsampleswas~97%.Theelectricalresistivity(?) andmaterialconstant( B )ofNi0.5Co0.5Cu0.15Mn1.85O4sampleweredeterminedas286Ohm.cmand 3355K.The values of electrical resistivity and material constant decreased with increasing CuO content.TheelectricalresistivityandmaterialconstantofNi0.5Co0.5Cu0.3Mn1.7O4samplewerecalculatedas61Ohm.cmand3124K

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