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Study on Nickel Ferrite Formation by Using a Simple Method to Simulate Heat Transfer Surface

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Abstract:

The condition of a heat transfer surface with boiling is composed of three environmental components; high temperature, high pressure and water vapor. In general an autoclave or a high temperature loop system is used for maintaining the required condition. The thermodynamic relationship of chemical reactions states that the free energy difference (ΔG) is clearly dependent on the reaction temperature and independent of the reaction pressure if the reaction has no volume change: (∂ΔG/∂P)T = ΔV ~ 0. Based on the above relationship, the high-pressure term was removed from the environmental components of the heat transfer surface. A vacuum quartz capsule with a moisturized metal oxide powder was used to study the formation of nickel ferrite. The feasibility of this simplified method to simulate a heat transfer surface was confirmed by an analysis of the FT-IR spectra and XRD pattern during the transformation of a nickel and iron mixed oxide into nickel ferrite.

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Info:

Periodical:

Solid State Phenomena (Volumes 124-126)

Pages:

1565-1568

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.124-126.1565

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Online since:

June 2007

Authors:

Jei Won Yeon, Kwang Soon Choi, Yongju Jung, Selvaraj Rengaraj, Yeong Keong Ha, Won Ho Kim

Keywords:

FT-IR, Heat Transfer Surface, High-Temperature, Iron Mixed Oxide, Nickel Ferrite, Nickel Mixed Oxide, Transformation, X-Ray Diffraction (XRD)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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