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Synthesis and characterization of single crystals Y3Fe 5O12 and Bi3Fe5O12 prepared via sol gel technique

N., Yahya and K.K.K., Koziol and M.K., Bin Mansor (2008) Synthesis and characterization of single crystals Y3Fe 5O12 and Bi3Fe5O12 prepared via sol gel technique. Diffusion and Defect Data. Pt A Defect and Diffusion Forum, 283-28 . pp. 406-412. ISSN 10120386

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Abstract

Magnetic properties of nano-crystalline yttrium iron garnet, Y <sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> and bismuth iron garnet, Bi <sub>3</sub>Fe<sub>5</sub>O<sub>12</sub> were studied. The samples were synthesized by using sol gel route. The gel were prepared using nitrates of yttrium and iron for the yttium iron garnet (YIG) and nitrates of bismuth and iron for the bismuth iron garnet (BIG). The raw materials were mixed and dissolved in citric acid and were stirred for 3 months in room temperature until the gel was observed. The X-ray diffraction pattern reveals the cubic structure of YIG and BIG samples at 700°C and 5007deg;C respectively. From the M-H diagrams it was found that the YIG and BIG samples have saturation magnetization, Ms of 27.2 Gs with rectangular hysteresis loop and 24.4 Gs with S hysteresis loop, respectively. It is evident from the FESEM micrographs that the rectangular loop shape (YIG) arises from the homogeneous and rounded micro structure as compared to the inhomogenous and random orientation micro structure (BIG) of the samples. From the Electron diffraction done on Transmission Electron Microscope, both of the samples were shown to be single crystals.

Item Type:Article
Uncontrolled Keywords:Bismuth; Diffraction; Dissolution; Garnets; Gelation; Gels; Holographic interferometry; Hysteresis; Magnetic materials; Magnetic properties; Magnetooptical devices; Magnets; Nitrogen compounds; Saturation magnetization; Silicate minerals; Sol-gel process; Sol-gels; Sols; Synthesis (chemical); Transmission electron microscopy; Yttrium; Yttrium alloys; Yttrium compounds; Microstructure; Bismuth iron garnets; Cubic structures; Iron garnets; Micro structures; Nano-crystalline; Random orientations; Rectangular hysteresis loops; Rectangular loops; Room temperatures; Sol-gel routes; Sol-gel techniques; Sol-gel.; Synthesis and characterizations; Transmission electron microscopes; X-ray diffraction patterns; Yttrium iron garnets; Single crystals; Bismuth iron garnet; Cubic structure; Iron garnet; Nanocrystallines; Random orientations; Rectangular hysteresis loop; Rectangular loops; Room temperature; Sol-gel routes; Sol-gel technique; Synthesis and characterization; Transmission electron microscope; Yttrium iron garnets
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE:Departments > Electrical & Electronic Engineering
ID Code:426
Deposited By: Assoc Prof Dr Noorhana Yahya
Deposited On:09 Mar 2010 01:59
Last Modified:19 Jan 2017 08:26

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