☑ Effect of annealing temperature on different physical properties of Sr0.5La0.5Mg0.5Fe11.5O19 hexaferrite

Bilal Hamid Bhat1, Zubida Habib2, Jyoti Sharma3, Basharat Want1, A . K. Srivastava3

1Solid State Research Lab. Department of Physics, University of Kashmir, Srinagar-19006, J&K, India

2 Department of Physics, National Institute of Technology, Srinagar-190006, J&K, India

3 Department of Physics, Lovely Professional University, Phagwara-144411, Punjab, India

  • subtitlesABSTRACT

    The influence of annealing on different physical properties of Sr0.5La0.5Mg0.5Fe11.5O19 hexaferrites prepared by the citrate-precursor method is presented in this study. The effects of temperature on the physical properties properties of the synthesized hexaferrites have been investigated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning Electron Miscroscopy (SEM) and Vibrating Sample Magnetometer (VSM). The XRD study shows the formation of hexagonal structure with grain size lying between 23.86 nm and 56.12 nm. FTIR was used to study functional groups associated with the material. A decrease in saturation magnetization (Ms), and increase in Coercivity (HC) is observed with increase in temperature. Also, anisotropy constant was calculated by using Law of Approach to saturation and is well agreement with the literature.

  • gamesKEYWORDS

    Magnetization, crystal structure, XRD, ferrites, microscopy, strain.

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☑ Comparative study of lube oils syhthesized from chemically modified castor and soybean oils using additive

Samuel Eshorame Sannia, Joseph Obofon Odigureb, Vincent Efeovbokhana, Moses Eterigho Emeterec

a Department of Chemical Engineering, Covenant University, P.M.B 1023, Ota, Nigeria.

b Department of Chemical Engineering, Federal University of Technology, P.M.B 65 Minna, Nigeria.

c Department of Physics, Covenant University, Ota, Ogun State, P.M.B 1023 Nigeria.

  • subtitlesABSTRACT

    Petroleum-base-lube oils are non-biodegradable and their continuous use results in environmental pollution. Comparatively, vegetable oils are biodegradable, less toxic and renewable hence, their use as base stock for lubricant production will not only serve as viable alternatives but also help in avoiding environmental deterioration. This paper compares the properties of soybean and castor oils as potential sources for synthesizing bio-lubes when mixed separately with styrene as additive. Styrene was used because of its advantageous polymeric behavior. Samples of soybean and castor oils were mixed with different volumes of the additive at 50oC. Fluid properties were determined with emphasis on viscosities of the oils. For the castor oil samples, their viscosities compare with those of standard oils at 40 oC and at 100 oC. These values show that soybean samples can replace base oils used in SAE15W - SAE20 monograde lubricant while castor oil samples can replace the SAE50 - SAE60 lubricants.

  • gamesKEYWORDS

    Additive; Biodegradability; Comparative analysis; Vegetable oils; lube oil

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