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Your search keyword '"Yüksel Price Berat"' showing total 14 results
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14 results on '"Yüksel Price Berat"'

1. Influence of V2O5 and B2O3 addition on the sintering behaviour and physical properties of ZnO ceramics

Author

Yüksel Price Berat, Hardal Gökhan, and Kınacı Barış

Subjects
boron oxide, ceramics, sintering, vanadium pentoxide, zinc oxide, Clay industries. Ceramics. Glass, TP785-869
Abstract

The effect of V2O5 and B2O3 additions on sintering behaviour and physical properties of ZnO ceramics was investigated. XRD studies revealed ZnO as main phase with a hexagonal wurtzite-type structure. The V2O5 addition is the reason for an increase in grain size and some grains of oblong shape morphology in the ZnO ceramics. The dual addition of V2O5-B2O3 improved the liquid-assisted sintering of ZnO ceramics and resulted in further increase in grain size with more uniform grain growth. The reduction of sintering temperature to 900°C for ZnO ceramics was observed with the dual addition of V2O5 and B2O3. The room temperature PL spectra of the Z (ZnO), ZV (ZnO with 0.5mol% V2O5) and ZVB (ZnO with 0.5mol% V2O5 and 0.5mol% B2O3) ceramics revealed broad visible emission band because of impurities and defects in ZnO ceramics caused by oxygen vacancies due to vanadium and boron additions, as well as zinc interstitials. This emission band between 450-750 nm includes the entire visible region from blue to red.

Published
2022
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4. Electrical and Microstructural Investigation of Ni0.5Co0.5Cu0.3Zn0.3Mn1.4O4 Temperature Sensors

Author

Hardal, Gökhan, Yüksel Price, Berat, Ikhmayies, Shadia, editor, Li, Bowen, editor, Carpenter, John S., editor, Li, JIan, editor, Hwang, Jiann-Yang, editor, Monteiro, Sergio Neves, editor, Firrao, Donato, editor, Zhang, Mingming, editor, Peng, Zhiwei, editor, Escobedo-Diaz, Juan P., editor, Bai, Chenguang, editor, Kalay, Yunus Eren, editor, Goswami, Ramasis, editor, and Kim, Jeongguk, editor

Published
2017
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8. The Effect of 0.15 and 0.30 mol CuO Additions on the Electrical Properties of Nickel Manganite-based NTC Thermistors

Author

YÜKSEL PRICE, Berat

Subjects
Engineering, Bakır oksit,Elektriksel özellikler,NTC termistör, Mühendislik, Copper oxide,Electrical properties,NTC thermistor
Abstract

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., 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.

Published
2017

12. Preparation and characterization of Ni–Co–Zn–Mn–O negative temperature coefficient thermistors with B2O3 addition.

Author

Yüksel Price, Berat and Hardal, Gökhan

Subjects
THERMISTORS, ELECTRICAL resistivity, GRAIN size, TEMPERATURE, CRYSTAL structure
Abstract

The effect of B2O3 addition on the electrical and microstructural properties of Ni0.5Co0.5ZnxMn2 − xO4 (where x = 0.15 and 0.3) negative temperature coefficient (NTC) thermistors was investigated. Ni0.5Co0.5Zn0.15Mn1.85O4 and Ni0.5Co0.5Zn0.3Mn1.7O4 samples were calcined at 900 °C and then sintered at 1100, 1200 and 1300 °C. Ni0.5Co0.5Zn0.15Mn1.85O4 + 0.1 mol B2O3 and Ni0.5Co0.5Zn0.3Mn1.7O4 + 0.1 mol B2O3 added samples were sintered at 900, 1000 and 1100 °C without applying calcination. The B2O3-doped samples sintered at 1100 °C without calcination gave rise to very similar crystal structure with un-doped sample. All samples sintered at 1100 °C consisted of a major cubic spinel phase, a minor tetragonal spinel and a minor NiO-rich phase. In addition, no peaks related to B2O3 or ZnO additions were observed. This result demonstrated that the B ions and Zn ions dissolved into the lattice. The bulk density and grain size of B2O3-doped samples without applying calcination were similar to calcined un-doped samples when all the samples were sintered at 1100 °C. It was also observed that the increase in Zn content had minimal effect on the bulk density and grain size of samples. The electrical resistivity and material constant for Ni0.5Co0.5Zn0.3Mn1.7O4 sample were 2475 Ω cm and 3660 K and for Ni0.5Co0.5Zn0.3Mn1.7O4 + 0.1 mol B2O3 sample were 1570 Ω cm and 3725 K when the samples were sintered at 1100 °C. NTC thermistor having lower electrical resistivity and higher material constant can be achieved with the addition of B2O3 without applying calcination. [ABSTRACT FROM AUTHOR]

Published
2019
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