scholarly journals Synthesis of Spinel Nanocrystalline ZnFe2O4: Structural, Optical, Magnetic and Electrical properties.

2021 ◽  
Author(s):  
Sasirekha Chelladurai ◽  
Raghavan Chandrasekaran ◽  
Sivaraman Murugasen
Keyword(s):  
Electrical Properties ◽  
Calcination Temperature ◽  
Optical Band Gap ◽  
Low Cost ◽  
Band Gap Energy ◽  
Precipitation Method ◽  
Calcination Temperatures ◽  
Paramagnetic Behavior ◽  
Co Precipitation ◽  
Magnetic And Electrical Properties

Abstract The present paper deals with the synthesis of Zinc Ferrite (ZnFe2O4) nanoparticles using simple, low cost co - precipitation method and study the structural, optical, magnetic and electrical properties. The samples have been prepared at two different calcination temperatures of 400˚ C and 600˚ C. The XRD studies indicate that the synthesized ZnFe2O4 samples exhibit cubic spinel structure and that the grain size increases with calcination temperature. The FTIR spectra demonstrate bands associated with metal – oxygen bonds in the tetrahedral and octahedral sites. Moreover, no unwanted impurity such as nitrate has been detected in the synthesized samples revealing their high purity. The micro structural analysis shows that though most particles are irregular granular ones, some are spherical. The optical band gap energy is found to increase with increasing calcination temperature. The Vibrating Sample Magnetometer (VSM) studies reveal the super paramagnetic behavior of the synthesized samples, even for a high Fe: Zn ratio of 1:2. The electrical resistivity of the samples decreases with increase in calcination temperature.This phenomenon has been explained on the basis of the Verwey-de Boer mechanism.

scholarly journals Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO2 Nanoparticles Induced by Low Calcination Temperature

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Panya Khaenamkaew ◽  
Dhonluck Manop ◽  
Chaileok Tanghengjaroen ◽  
Worasit Palakawong Na Ayuthaya
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Calcination Temperature ◽  
Tin Dioxide ◽  
Lattice Strain ◽  
Dielectric Constants ◽  
Precipitation Method ◽  
Calcination Temperatures ◽  
Sensing Applications ◽  
Crystallite Sizes

The electrical properties of tin dioxide (SnO2) nanoparticles induced by low calcination temperature were systematically investigated for gas sensing applications. The precipitation method was used to prepare SnO2 powders, while the sol-gel method was adopted to prepare SnO2 thin films at different calcination temperatures. The characterization was done by X-ray diffraction, scanning electron microscopy (SEM), and atomic force microscopy (AFM). The samples were perfectly matched with the rutile tetragonal structure. The average crystallite sizes of SnO2 powders were 45 ± 2, 50 ± 2, 62 ± 2, and 65 ± 2 nm at calcination temperatures of 300, 350, 400, and 450°C, respectively. SEM images and AFM topographies showed an increase in particle size and roughness with the rise in calcination temperature. The dielectric constant decreased with the increase in the frequency of the applied signals but increased on increasing calcination temperature. By using the UV-Vis spectrum, the direct energy bandgaps of SnO2 thin films were found as 4.85, 4.80, 4.75, and 4.10 eV for 300, 350, 400, and 450°C, respectively. Low calcination temperature as 300°C allows smaller crystallite sizes and lower dielectric constants but increases the surface roughness of SnO2, while lattice strain remains independent. Thus, low calcination temperatures of SnO2 are promising for electronic devices like gas sensors.

Tailoring optical, magnetic and electric behavior of lanthanum strontium manganite La1−xSrxMnO3 (LSM) nanopowders prepared via a co-precipitation method with different Sr2+ ion contents

RSC Advances ◽  
2016 ◽  
Vol 6 (22) ◽  
pp. 17980-17986 ◽  
Author(s):  
Ali Omar Turky ◽  
Mohamed Mohamed Rashad ◽  
Ali Mostafa Hassan ◽  
Elsayed M. Elnaggar ◽  
Mikhael Bechelany
Keyword(s):  
Electrical Properties ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
Lanthanum Strontium Manganite ◽  
Lanthanum Strontium ◽  
Electric Behavior ◽  
Ion Contents ◽  
Co Precipitation ◽  
Magnetic And Electrical Properties

We report on the synthesis and characterization of lanthanum strontium manganite with tunable optical, magnetic and electrical properties.

scholarly journals PENGARUH TEMPERATUR KALSINASI DAN SUBSITUSI LOGAM NIKEL PADA PEMBENTUKAN FASA BARIUM M-HEXAFERRITTE (BaFe12-xNixO19) MENGGUNAKAN FTIR

2015 ◽  
Vol 10 (1) ◽  
Author(s):  
Susilawati Susilawati ◽  
Munib Munib ◽  
Aris Doyan
Keyword(s):  
Fourier Transform ◽  
Calcination Temperature ◽  
Barium Hexaferrite ◽  
Precipitation Method ◽  
Nickel Metal ◽  
Calcination Temperatures ◽  
Infra Red ◽  
M Phase ◽  
Materials Used ◽  
Co Precipitation

Abstrak: Sintesis Barium M-Hexaferrite (BaFe12-xNixO19) doping logam nikel telah dilakukan dengan metode korpresipitasi dan efeknya terhadap perubahan temperatur dan subsitusi dopan. Bahan dasar yang digunakan dalam sintesis BaCO3, FeCl3.6H2O dan logam nikel. Dalam penelitian ini digunakan variasi temperatur kalsinasi 80, 400, 600 dan 800°C selama 4 jam dengan variasi dopan 0; 0,4; 0,7 dan 0,9. Hasil sintesis dikarakterisasi dengan FTIR (Fourier Transform Infra Red Spectroscopy) merek Shimidzu tipe 8400 s. Hasil pembentuka fasa dari barium M-hexaferrite (BaFe12-xNixO19) diketahui melalui data FTIR seiring dengan meningkatkan temperatur kalsinasi yang digunakan diperoleh puncak yang muncul pada rentang bilangan gelombang 800 - 1650 cm-1 semakin sedikit, sehingga pembentukan fasa barium M-hexaferrite yang signifikan terbentuk pada temperatur kalsinasi 800 °C dan pada variasi dopan 0,7.Kata kunci:   Temperatur, dopan, barium M-hexaferrite, kopresipitasi Abstract: Synthesis of Barium M-Hexaferrite (BaFe12-xNixO19) nickel metal doping have been done with co-precipitation method and its effect on temperature changes and substitution dopants. Basic materials used in the synthesis of BaCO3, FeCl3.6H2O and nickel metal. This study used a variation of calcination temperature of 80, 400, 600 and 800°C for 4 hours with a variety of dopants 0; 0.4; 0.7 and 0.9. Synthesized characterized by FTIR (Fourier Transform Infra Red Spectroscopy) Shimidzu brand type 8400 s. Results of the phase formation of barium M-hexaferrite (BaFe12-xNixO19) known through the data FTIR along with increasing the calcination temperatures used were obtained peak appearing in the range of wavenumber 800 to 1650 cm-1 is getting a little bit, so the formation of M-phase barium hexaferrite significant formed at calcination temperature of 800 ° C and at variations of dopant  0.Key words: temperature, dopant, barium M-hexaferrite, co-precipitation

Effect of the Synthesis Method on the Properties of Ultrafine YAG Powder

2018 ◽  
Vol 281 ◽  
pp. 40-45
Author(s):  
Jie Guang Song ◽  
Lin Chen ◽  
Cai Liang Pang ◽  
Jia Zhang ◽  
Xian Zhong Wang ◽  
...  
Keyword(s):  
Particle Size ◽  
Calcination Temperature ◽  
Hydrothermal Reaction ◽  
Synthesis Method ◽  
Particle Morphology ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Powder Materials ◽  
Co Precipitation

YAG materials has a number of unique properties, the application is very extensive. In this paper, the superfine YAG powder materials were prepared by co-precipitation method and hydrothermal precipitation method. The influence of synthesis process on the morphology of the powder was investigated. The results showed that the precursor powder prepared via the co-precipitation method is mainly from amorphous to crystalline transition with the increasing calcination temperature, the precursor agglomeration is more serious, In the process of increasing the calcination temperature, the dispersibility of the roasted powder is greatly improved, which is favorable for the growth of the crystal grains, so that the particle size of the powder is gradually increased, the YAG precursor prepared by the co-precipitation method is transformed into YAG crystals, the phase transition occurs mainly between 900 and 1100°C. When the molar ratio of salt to alkali is Y3+: OH-=1: 8 via the hydrothermal reaction, the YAG particles with homogeneous morphology can be obtained. When the molar ratio of salt and alkali is increased continuously, the morphology of YAG particles is not obviously changed. The co-precipitation method is easy to control the particle size, the hydrothermal method is easy to control the particle morphology.

Biological activity of gum Arabic-coated ferrous oxide nanoparticles

2021 ◽  
pp. 2150411
Author(s):  
Rania Hasan Huseen ◽  
Ali A. Taha ◽  
Ihab Q. Ali ◽  
Oday Mahmmod Abdulhusein ◽  
Selma M. H. Al-Jawad
Keyword(s):  
Iron Oxide ◽  
Cell Line ◽  
Biological Activities ◽  
Low Cost ◽  
Gum Arabic ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Electron Microscopic ◽  
Co Precipitation ◽  
Mcf 7

In this study, iron oxide nanoparticles (NPs) had been prepared by co-precipitation method. In order to reduce their toxicity and increase stability, prepared iron oxide was coated with gum Arabic. Gum Arabic is preferred over synthetic materials due to their non-toxicity, low cost and availability. Characterization of coated and non-coated iron oxide NPs had been performed by spectrophotometer, Fourier transfer infra-red spectrophotometer (FTIR), Zeta potential, X-ray diffraction (XRD) and field emission scanning electron microscopic (FE-SEM). The fabricated nanoparticles appeared purity and crystalline nature by XRD, with diameter average of 27.01 nm and 55.12 nm for iron oxide NPs and iron oxide NPs coated with gum Arabic, respectively. On the other hand, four biological activities of coated and non-coated iron oxide had been investigated. High removal of methylene blue pollutant dye (46%) was observed with iron oxide NPs, while removal percentage was 22.6 performed by iron oxide NPs coated with gum Arabic within 72 h. Iron oxide NPs revealed high inhibition zones of 27.5 nm and 30 mm, at 1000 [Formula: see text]g/ml, against S. aureus and E. coli, respectively, while coated iron oxide NPs with gum Arabic revealed low antibacterial activity against both examined bacteria even when used at 1000 [Formula: see text]g/ml. The hemolytic activity of prepared NPs had been determined. The hemolytic percentage was increased whenever concentrations of nanoparticles increased. Lower hemolytic percentages were 69.76 and 50.98 for iron oxide NPs and iron oxide NPs coated with gum Arabic were observed at a concentration of 250 [Formula: see text]g/ml. Finally, cytotoxic activity was estimated against MCF-7 cell line and normal cell line WRL68 by MTT assay. A decrease in MCF-7 viability to 65.1% was observed when 400 [Formula: see text]g/ml of iron oxide NPs was used, while WRL68 viability was 75.03%. Iron oxide NPs coated with gum Arabic revealed significant reduction in MCF-7 and WRL68 viability to 69.90% and 80.05%, respectively, when 400 [Formula: see text]g/ml of nanoparticles was applied.

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