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Article
Structural Characteristics of Nickel Ferrite Nanoparticles Synthesized by New Arrangement of Concentric Targets in DC Reactive Magnetron Sputtering

Authors: Firas J. Kadhim --- Ruaa A. Mohammed
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2016 Volume: 12 Issue: 4 Pages: 9-12
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Nickel ferrite (NiFe2O4) nanostructures were synthesized by co-sputtering of Ni and Fe targets in presence of oxygen. A dc plasma sputtering system employing closed-field unbalanced magnetron at the anode was used for the preparation of these films. The structural characteristics of the prepared films were determined and the results showed that these films are polycrystalline, highly pure, with average particle size of 20-25nm and average surface roughness of 0.465nm. These nickel ferrite nanostructures were prepared at low production cost, high reliability and reasonable structural purity.


Article
Effect of Calcination on Characteristics of Nickel Ferrite Nanoparticles Synthesized by Sol-Gel Method

Authors: Emerson Pérez --- Gerson Marquez --- Vicente Sagredo
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2019 Volume: 15 Issue: 1 Pages: 13-17
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

Nanosized nickel ferrite compound was synthesized by using sol-gel method. Significant differences in the particle size were obtained after two different calcination cycles at 873 and 1073 K. The average particle size of sample calcinated at 873K was found to be  25 nm which increases up to 120 nm on calcination at 1073 K. Low-field magnetization data show at room temperature an strong irreversibility between zero field cooled(ZFC) and field cooled(FC) cycles without a clear blocking temperature. The FC data shows a behavior typical for strongly coupled system because of the interaction particle-particle favored by the agglomeration of particles observed by the SEM micrographs. The effective magnetic moment per molecule evaluated from hysteresis loops at magnetic field of 5.5 Tesla is slightly smaller than 2μB.


Article
Synthesis of Nickel Ferrite NiFe2O4 Nanoparticles/PVA composite and studying Its electric properties
تحضير المركب نيكل فرايت(NiFe2O4/PVA) ودراسة خصائصه الكهربائية

Authors: Ibrahim F. waheed ابراهيم فهد وحيد --- Emaad T. Bakir عماد طه بكر --- Sabah M. Ali صباح محمد على
Journal: Tikrit Journal of Pure Science مجلة تكريت للعلوم الصرفة ISSN: 18131662 Year: 2016 Volume: 21 Issue: 6 Pages: 55-60
Publisher: Tikrit University جامعة تكريت

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Abstract

In this work focused on preparing Nickel Ferrite NiFe2O4 Nanoparticles (NFNPs) which prepared by Sol-Gel Auto-Combustion Method. Incorporating (NFNPs) in PVA afforded NFNPs/PVA composites with different weight of NFNPs. the NFNPs /PVA composite and pure PVA were identified by different techniques, FTIR measurements, The scanning electron microscope (SEM), and powder x-ray diffraction. The electrical properties of the NFNPs/PVA composite was investigated. These properties include dielectric constant, permittivity(ε'), imaginary permittivity(ε"), conductivity (

في هذا البحث ركزنا على تحضير مركب لاعضوي نانوي وهو Nickel Ferrite NiFe2O4 Nanoparticles (NFNPs) حيث يتم تحضير هذا المركب بطريقة الاحتراق الذاتي للسول-جل. مزج (NFNPs) مع متعدد (فينايل الكحول) (PVA) حيث نحصل على التركيب NFNPs/PVA وبنسب مختلفة من (NFNPs). شخص كل من PVA النقي والمركب NFNPs/PVA بتقنيات مختلفة بواسطة الاشعة تحت الحمراء (FTIR) والمجهر الالكتروني (SEM) وحيود الاشعة السينية للمسحوق (RXD). الصفات الكهربائية للمركب NFNPs/PVA درست حيث شملت السماحية الحقيقية (ε') والخيالية (ε"), والتوصيلية الكهربائية (


Article
Preparation and study dielectric properties of Copper-nickel ferrite nanoparticles by hydrothermal method
تحضير ودراسة الخصائص العزلية لنانوي نحاس-نيكل فرايت بتقنية الحرارية المائية

Author: Farah T. M. Noori فرح طارق محمد نوري
Journal: Diyala Journal For Pure Science مجلة ديالى للعلوم الصرفة ISSN: 83732222 25189255 Year: 2015 Volume: 11 Issue: 3 Pages: 43-59
Publisher: Diyala University جامعة ديالى

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Abstract

Copper-nickel ferrites were synthesized by employing hydrothermal sol gel technique with general formula Ni1-xCuxFe2O4where x=0.0, 0.3 and 0.5. The pellets of 1.5 cm diameter were prepared with 2 mm thickness by applying pressure of 3 Tons and then sintering with different temperature (600, 700, 800 and 900) °C for further characterization. The main cubic spinal structure phase for all samples was confirmed by x-ray diffraction patterns The prepared specimens were characterized by XRD structural analysis indicates that the percentage of iron ions in B site increases, the intensity of the (311) peak increases. This indicates that the structural changes of the Ni1-xCuxFe2O4, arise from the shifting of ions between A and B sites. Atomic force microscopy showed that the average grain size was about 52.3nm. The morphology was studies using SEM and it is found that the grains had an irregular distribution and irregular shape. The Copper-nickel ferrite (Ni1-xCuxFe2O4) shows high σac conductivity due to dipole polarization. The dielectric constants of the sampleswere noticed to decrease with frequency and Cu addition and due to the different sintering temperatures.

تم تحضير نيكل فرايت بتقنية الحرارية المائية sol gel– ذو الصيغة التركيبية Ni1-xCuxFe2O4 حيث ان x=0.3, 0.5 تم اعداد الاقراص ذات القطر cm1.5 بسمك 2 mm بضغط مسلط 3 ton ثم التلبيد بدرجات حرارة مختلفة (600, 700, 800 and 900) °C لغرض التشخيص. طور التركيب الرئيسي لكل العينات السبينل المكعب الذي شخص باستخدام حيود الاشعة السينية وكذلك التحليل البنيوي لكل العينات تم تشخيصها بالاشعة السينية ان نسبة الحديد تزداد بالموقع B عند معامل ميلر (311) وهذا يدل على ان التغييرات الهيكلية ل Ni1-xCuxFe2O4 ، تنشأ من التحول من الأيونات بين المواقع A و B. أظهر مجهر القوة الذرية أن متوسط حجم الحبوب بلغ نحو 52.3nm. صور المجهر الالكتروني بينت ان الحبيبات غير منتظمة التوزيع والشكل. التوصيلية الكهربائية تزداد بزيادة تركيز النحاس وبزيادة درجة حرارة التلبيد. ثوابت العزل تنخفض مع زيادة تركيز النحاس والتردد وكذلك بسبب اختلاف درجات الحرارة للتلبيد.

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