Ion-beam modification of Gd[sub 2]Ti[sub 2]O[sub 7]

Conference · Tue Sep 01 04:00:00 EDT 1992

OSTI ID:6917067

Weber, W J; Hess, N J

Irradiation of Gd[sub 2]Ti[sub 2]O[sub 7] with 3 MeV Ar[sup +] ions results in expansion of the unit-cell volume from defect accumulation as well as irradiation-induced amorphization. The damage cross-section for amorphization determined from X-ray diffraction analysis is 0.023 nm[sup 2]. Transmission electron microscopy and electron diffraction have confirmed the irradiation-induced amorphous character at high fluences. Raman spectroscopy indicates a decrease in scattered intensity and an increase in linewidth with fluence for the principal vibrational modes, consistent with increasing irradiation-induced disorder. The wavenumber of the most intense Raman peak at [approximately] 310 cm[sup [minus]1] (attributed to the O-Gd-O bending mode) decreases with fluence, indicating a change in bond Angle. The increase in the wavenumber of the Raman peak at [approximately] 515 cm[sup [minus]1] (attributed to the Gd-O stretching mode) with fluence suggests a decrease in bone length. At intermediate fluences, a forbidden peak at 765 cm[sup [minus]1]1 becomes slightly activated by irradiation-induced disorder on the cation sites.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6917067
• Report Number(s): PNL-SA-20885; CONF-9209200--6; ON: DE93001514
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360206* -- Ceramics
Cermets
& Refractories-- Radiation Effects
AMORPHOUS STATE
ARGON IONS
BEAMS
CHALCOGENIDES
CHARGED PARTICLES
ENERGY RANGE
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
ION BEAMS
IONS
MEV RANGE
MEV RANGE 01-10
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPECTRA
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS