Tunneling states in neutron-irradiated quartz: Measurements of the ultrasonic attenuation and velocity change

Journal Article · Sat Sep 15 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.5842· OSTI ID:6435119

Vanelstraete, A; Laermans, C ^[1]

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1. Department of Physics, Katholieke Universiteit Leuven, Laboratorium voor Vaste Stof-en Hoge Druk-Fysica, Celestijnenlaan 200 D, 3030 Leuven (Belgium)

We report the results of a systematic investigation of the tunneling states (TS's) in neutron-irradiated quartz. Measurements of the acoustic absorption and the variation of the velocity of sound were carried out as a function of temperature (0.3--300 K) and in the ultrasonic frequency range 200--700 MHz, on quartz specimens exposed to different neutron doses. From numerical fits of the data with the tunneling model, including Raman processes, the density of states {ital {bar P}} and the coupling parameter {gamma}{sub {ital l}} were determined independently. A comparison of the TS parameters obtained from both attenuation and velocity measurements with each other and with our previous ultrasonic-attenuation studies and with thermal-conductivity and vibrating-reed experiments shows that the results are qualitatively in agreement with each other, but indicates some shortcomings of the tunneling model, also observed in glasses. TS parameters deduced from experiments which probe TS's of different parts of the distribution function are systematically found to be slightly different. The results are further related to studies of the damage induced by neutron irradiation in quartz. The differences in dose units, used by different authors, are considered more closely, which leads to a consistent picture of the damage-related parameters and allows a more reliable comparison between the TS and the damage.

• OSTI ID: 6435119
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:9; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
360605 -- Materials-- Radiation Effects
ACOUSTIC TESTING
AMORPHOUS STATE
ATTENUATION
BEAMS
CHALCOGENIDES
IRRADIATION
MATERIALS TESTING
MINERALS
NEUTRON BEAMS
NONDESTRUCTIVE TESTING
NUCLEON BEAMS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
PHYSICAL RADIATION EFFECTS
QUARTZ
RADIATION EFFECTS
SILICON COMPOUNDS
SILICON OXIDES
SOUND WAVES
TESTING
TUNNEL EFFECT
ULTRASONIC TESTING
ULTRASONIC WAVES