Ion-beam-induced spinel-to-rocksalt structural phase transformation in MgAl{sub 2}O{sub 4}

Journal Article · Mon May 01 04:00:00 EDT 2000 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.126406· OSTI ID:20216178

Ishimaru, Manabu ^[1]; Afanasyev-Charkin, Ivan V ^[1]; Sickafus, Kurt E ^[1]

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1. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

An ion-beam-induced metastable phase in magnesium aluminate spinel (MgAl{sub 2}O{sub 4}) has been examined in detail using transmission electron microscopy. Single crystals of MgAl{sub 2}O{sub 4} with (111) orientation were irradiated with 180-keV Ne{sup +} ions at 120 K to fluences of 10{sup 16} and 10{sup 17}/cm{sup 2}. Selected-area electron diffraction patterns obtained from the irradiation-induced damaged layer revealed that all even hkl reflections (e.g., 222) possess strong intensity, while all odd hkl reflections (e.g., 111) are weak. The features of these diffraction patterns corresponded to those of the rocksalt (NaCl) structure, suggesting that an ordered spinel to disordered rocksalt structural phase transformation in MgAl{sub 2}O{sub 4} was induced by ion beam irradiation. (c) 2000 American Institute of Physics.

• OSTI ID: 20216178
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 18 Vol. 76; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
EXPERIMENTAL DATA
ION BEAMS
MAGNESIUM OXIDES
METASTABLE STATES
NEON IONS
PHASE TRANSFORMATIONS
RADIATION EFFECTS
TRANSMISSION ELECTRON MICROSCOPY