Ultrasonic study of trapped hydrogen in niobium

Thesis/Dissertation · Thu Dec 31 23:00:00 EST 1981

DOI:https://doi.org/10.2172/6774684· OSTI ID:6774684

Huang, Kai-Feng ^[1]

---

1. Univ. of Illinois, Urbana-Champaign, IL (United States)

A review of all the available data (specific heat, internal friction, neutron scattering, channeling, thermal conductivity) on Nb-O-H or Nb-N-H systems, is first given. An eight-state tunnelling model is proposed, and the properties of the system are developed. A comparison of the predictions of this model with the data is given, and the four parameters that describe the model are determined. A simple potential calculation is also performed to demonstrate the qualitative features of the model. Measurements have been made of ultrasonic attenuation and velocity in the Nb-O-H system as a function of temperature, frequency, polarization and isotope. In addition to the previously found stable peak, an additional peak is found when the specimen is cooled rapidly. The peak anneals at the same temperature as those found by Hanada in their resistivity quenching experiments, indicating that the quenched-in defect is an OH₂ complex. An extension of the model is given to account for the relaxation.

• Research Organization: Illinois Univ., Urbana-Champaign (United States). Dept. of Physics
• Sponsoring Organization: USDOE Office of Energy Research (ER)
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 6774684
• Report Number(s): DOE/ER/01198--1389; ON: DE83001127
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADSORPTION
ANNEALING
ATTENUATION
CRYSTAL DEFECTS
CRYSTAL MODELS
CRYSTAL STRUCTURE
DEUTERIUM
ELEMENTS
HEAT TREATMENTS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
METALS
NIOBIUM
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXYGEN
PHYSICAL PROPERTIES
SORPTION
SORPTIVE PROPERTIES
SOUND WAVES
SPECIFIC HEAT
STABLE ISOTOPES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRAPPING
ULTRASONIC WAVES
VELOCITY