Crystal structure and microstructure of el-Fe2O3 particles

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The structure and microstructure of el-Fe2O3 particles used in magnetic recording media have been analyzed by convergent beam electron diffraction and conventional transmission electron microscopy. Convergent beam electron diffraction results show that el-Fe2O3 particles have a primitive lattice with an m3m point group and a cubic superstructure with lattice parameter approximately equal to three times the lattice parameter of the magnetite structure. This superlattice is a result of cation vacancy ordering. An order-disorder transition of the structure is observed in the electron microscope and is believed to be caused by electron radiation-enhanced diffusion. Transmission electron microscopy results show that these ... continued below

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Pages: 59

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Ho, H.M. August 1, 1985.

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Description

The structure and microstructure of el-Fe2O3 particles used in magnetic recording media have been analyzed by convergent beam electron diffraction and conventional transmission electron microscopy. Convergent beam electron diffraction results show that el-Fe2O3 particles have a primitive lattice with an m3m point group and a cubic superstructure with lattice parameter approximately equal to three times the lattice parameter of the magnetite structure. This superlattice is a result of cation vacancy ordering. An order-disorder transition of the structure is observed in the electron microscope and is believed to be caused by electron radiation-enhanced diffusion. Transmission electron microscopy results show that these particles are single crystals, and hence the theory that polycrystallinity is the cause of the discrepancy in coercivity between the experimental and theoretical values cannot be true. 35 refs., 17 figs., 5 tabs.

Physical Description

Pages: 59

Notes

NTIS, PC A04/MF A01; 1.

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  • Other Information: Portions of this document are illegible in microfiche products. Thesis

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  • Other: DE86005998
  • Report No.: LBL-20570
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/6303280 | External Link
  • Office of Scientific & Technical Information Report Number: 6303280
  • Archival Resource Key: ark:/67531/metadc1108803

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1985

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • April 25, 2018, 3:59 p.m.

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Ho, H.M. Crystal structure and microstructure of el-Fe2O3 particles, report, August 1, 1985; [Berkeley,] California. (digital.library.unt.edu/ark:/67531/metadc1108803/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.