Quadrupole coupling parameters and structural aspects of crystalline and amorphous solids by NMR and NQR

Miscellaneous · Tue Jan 01 00:00:00 EST 1991

OSTI ID:7156545

Mao, Degen

NMR and NQR techniques were combined to obtain the quadrupole coupling constant (Qcc) and asymmetry parameter ({eta}) and extract structural information for several borate, gallate, and metavanadate compounds and glasses. {sup 71}Ga and {sup 69}Ga NMR was used to study crystalline {beta}-Ga{sub 2}O{sub 3} and several gallate glasses. Quadrupole parameters were acquired for GaO{sub 6} and GaO{sub 4} units in {beta}-Ga{sub 2}O{sub 3} by the computer simulation of the NMR powder patterns. A sensitive CW NQR spectrometer was built to detect NQR resonances below 2 MHz. The spectrometer includes a modified Robinson oscillator-detector, a new bi-symmetric square wave Zeeman modulator and a computerized data acquisition system. {sup 51}V (I = 7/2) NQR resonances below 850 kHz were detected for several metavanadates at both room temperature and liquid nitrogen temperature. Two methods, Zeeman perturbed NQR powder pattern and {sup 10}B NQR, can be employed to obtain both Qcc and {eta}. With a double coil tank circuit design, pure {sup 11}B NQR was used to determine the fraction of borons in BO{sub 3} and BO{sub 4} configurations in hydrated zinc borates. {sup 11}B NMR and NQR were also used to study lead borate glasses.

• Research Organization: Brown Univ., Providence, RI (United States)
• OSTI ID: 7156545
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
BORON OXIDES
CRYSTAL STRUCTURE
GALLIUM OXIDES
VANADIUM OXIDES
AMORPHOUS STATE
BORON 10
BORON 11
GALLIUM 69
GALLIUM 71
NUCLEAR MAGNETIC RESONANCE
NUCLEAR QUADRUPOLE RESONANCE
VANADIUM 51
BORON COMPOUNDS
BORON ISOTOPES
CHALCOGENIDES
GALLIUM COMPOUNDS
GALLIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
RESONANCE
STABLE ISOTOPES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM ISOTOPES
665100* - Nuclear Techniques in Condensed Matter Physics - (1992-)
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies