The structural properties of barium cobalt hexaferrite powder prepared by a simple heat treatment method

Chauhan, Chetna C.; Jotania, Rajshree B.

doi:10.1063/1.4946054

Cited by 4 publications

(5 citation statements)

References 18 publications

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“…The Fe–O stretching vibration band of the bulk magnetite is usually at 570 cm −1 and the band shifted to high wave numbers because of the finite size of the nanoparticles. The bands located at 1351 cm −1 and 858.17 cm −1 are associated with the N–O stretching vibration and bending vibration of NO 3 − [ 26 ]. The notable bands at about 1385 and 1430 cm −1 are attributed to nitrate ion and barium carbonate, respectively.…”

Section: Resultsmentioning

confidence: 99%

Biodiesel Production by Aspergillus niger Lipase Immobilized on Barium Ferrite Magnetic Nanoparticles

et al. 2016

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In this study, Aspergillus niger ADM110 fungi was gamma irradiated to produce lipase enzyme and then immobilized onto magnetic barium ferrite nanoparticles (BFN) for biodiesel production. BFN were prepared by the citrate sol-gel auto-combustion method and characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and scanning electron microscopy with energy dispersive analysis of X-ray (SEM/EDAX) analysis. The activities of free and immobilized lipase were measured at various pH and temperature values. The results indicate that BFN–Lipase (5%) can be reused in biodiesel production without any treatment with 17% loss of activity after five cycles and 66% loss in activity in the sixth cycle. The optimum reaction conditions for biodiesel production from waste cooking oil (WCO) using lipase immobilized onto BFN as a catalyst were 45 °C, 4 h and 400 rpm. Acid values of WCO and fatty acid methyl esters (FAMEs) were 1.90 and 0.182 (mg KOH/g oil), respectively. The measured flash point, calorific value and cetane number were 188 °C, 43.1 MJ/Kg and 59.5, respectively. The cloud point (−3 °C), pour point (−9 °C), water content (0.091%) and sulfur content (0.050%), were estimated as well.

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Section: Resultsmentioning

confidence: 99%

Biodiesel Production by Aspergillus niger Lipase Immobilized on Barium Ferrite Magnetic Nanoparticles

et al. 2016

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“…Also, 2250, 1774, 1427, 1306 and 947 cm −1 oscillation of C=O, H-C-H, C-H and C-C respectively and 878 and 650 cm −1 metal oxygen M-O. These results were shown hexagonalferrite due to octahedral and tetrahedral complexes present Y-type hexagonal ferrites [8][9][10]. O-H-, and NO3 bands is not visible because the y hexagonal structure is dominant.…”

Section: Fourier Transform Infraredmentioning

confidence: 95%

Hegzagonal Ferritlerin İmalatı ve Elektromanyetik Soğurma Özelliklerinin İncelenmesi

Bayrakdar¹

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Nanocomposite materials were obtained by synthesizing Ba2Bi2Co2Fe12O22 Nano Particles with polyaniline and polyacrylonitrile polymers. Composites in this nanostructure; structural, magnetic and electromagnetic absorption properties were examined. It was observed from the x-ray analysis that the nano-structured particles had crystalline structure and shown Y-type hexagonal structure. It can be also seen from the IR measurements that it has this structure at 878 and 650 cm −1 . The Electron Spin Resonance experiment of nanoparticles have been measured at room temperature and shown quite wide spectra and splitting factor. Vibration Sample Magnetometer measurements were made at 10-50 and room temperature. It can be said that nanoparticles useable so successful the magnetic recording media, applications of microwave technologies. Electromagnetic absorption experiments were measured approximately 5-20 GHz in the frequency band by used the free space method. These electromagnetic absorbers are using for 1,5 mm. thickness of the samples obtained 6 GHz. wide -50 db. loss of reflection was measured.

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Section: Karakterisasi Barium M-heksaferitunclassified

“…Pada bilangan gelombang 3700-3200 cm -1 mengindikasikan adanya gugus fungsi O-H [12]. Hasil ini mirip dengan hasil penelitian sebelumnya yaitu pada bilangan gelombang 3352 cm -1 , 3640 cm -1 , 2923 cm -1 dan 2151 cm -1 yang artinya terdapat ikatan O-H [7][8][9]. Terdapat puncak pada bilangan gelombang 1651 cm -1 , hasil ini serupa dengan penelitian sebelumnya mendapatkan puncak 1628 cm -1 yang mengindikasikan adanya air pada sampel [7].…”

Section: Karakterisasi Barium M-heksaferitunclassified

PENGARUH VARIASI TEMPERATUR KALSINASI TERHADAP BARIUM M-HEKSAFERIT DIDOPING Zn MENGGUNAKAN FOURIER TRANSFORM INFRA RED

Doyan¹,

Halik²,

Susilawati³

2015

J. Pijar MIPA

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Abstrak: Barium M-heksaferit (BaM) merupakan bahan magnet permanen yang tergolong hardmagnetic tetapi tidak sesuai untuk beberapa aplikasi, sehingga perlu dilakukan rekayasa untuk menurunkan sifat kemagnetannya menjadi softmagnetic. Penelitian ini bertujuan untuk mengetahui pengaruh temperatur kalsinasi terhadap barium M-heksaferit didoping Zn menggunakan pengukuran FTIR. Proses sintesis barium M-heksaferit menggunakan metode kopresipitasi dengan memvariasikan konsentrasi dopannya 0,0; 0,3; 0,6; dan 0,9 serta memvariasikan temperatur kalsinasi 80 o C, 400 o C, 600 o C dan 800 o C. Setelah melakukan proses sintesis selanjutnya dilakukan pengujian sampel menggunakan FTIR (Fourier Transform Infra Red). Penelitian ini telah berhasil melakukan sintesis dengan hasil berupa serbuk barium M-heksaferit berwarna coklat muda hingga coklat tua. Berdasarkan hasil pengujian FTIR didapatkan puncak-puncak pada bilangan gelombang 3447cm, 470cm -1 masing-masing mengindikasikan adanya gugus fungsi O-H, Ba-O, Fe-O dan Zn-O pada sampel. Puncak yang timbul pada ikatan O-H semakin mengecil menandakan bahwa ikatan pada gugus fungsi tersebut semakin melemah atau bahkan hilang. Hasil pengujian FTIR tersebut menyatakan bahwa temperatur kalsinasi sangat berpengaruh pada proses sintesis BaM. Semakin tinggi temperatur kalsinasi, bahan pengotor seperti air dan CO pada barium M-heksaferit semakin berkurang, ini menunjukkan barium M-heksaferit yang dihasilkan dapat digunakan sebagai bahan softmagnetic.Kata Kunci: Barium M-Heksaferite, sintesis, kopresipitasi, magnet, FTIR Abstract: Barium M-hexaferrite (BaM) is a permanent magnetic material which is relatively hardmagnetic but it is not appropriate for some applications that need to be engineered to degrade the nature of magnetism to be softmagnetic. This study aims to determine the effect of calcinations temperature on Zn doped BaM using FTIR measurements. Synthesis of BaM using coprecipitation method by varying the concentrate of dopan 0,0; 0,3; 0,6; dan 0,9 and varying the calcinations temperature 80 o C, 400 o C, 600 o C dan 800 o C. After synthesis of BaM and than the samples were studied using FTIR (Fourier Transform Infra Red). This study has success to synthesis of BaM and the product is a brown powder. Based on the test result of FTIR has been obtained peaks in wave number 3447cm -1 , 2345cm -1 , 1615cm -1 , 530cm -1 , 470cm -1 indicated a functional group O-H, Ba-O, Fe-O dan Zn-O on the powder sample. The peak on O-H shrinking indicates that the bond of functional groups are weakened or even disappear.The result of FTIR said that calcinations temperature has effect to BaM synthesis process. It is found that water and CO decrease with increase in calcinations temperature, it is showed the product BaM can be used to softmagnetic.

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The structural properties of barium cobalt hexaferrite powder prepared by a simple heat treatment method

Cited by 4 publications

References 18 publications

Biodiesel Production by Aspergillus niger Lipase Immobilized on Barium Ferrite Magnetic Nanoparticles

Biodiesel Production by Aspergillus niger Lipase Immobilized on Barium Ferrite Magnetic Nanoparticles

Hegzagonal Ferritlerin İmalatı ve Elektromanyetik Soğurma Özelliklerinin İncelenmesi

PENGARUH VARIASI TEMPERATUR KALSINASI TERHADAP BARIUM M-HEKSAFERIT DIDOPING Zn MENGGUNAKAN FOURIER TRANSFORM INFRA RED

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