Thermal vacancies in HCP helium-4

Activation energies of thermal vacancies have been determined in hcp $\sp4$He as a function of molar volume. A sensitive strain gauge was used to measure the temperature dependence of the pressure in twenty crystals between 18.17 and 20.9 cm$\sp3$/mole. Absolute lattice parameters at low temperatures were measured for many of these crystals. The temperature dependence of the relative lattice parameter was measured in selected crystals. This provided lower bounds on the vacancy activation energy.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics, Condensed Matter

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Thorpe, John Clifton

Contributors dc:contributor

• Simmons, R.O.

• Physics, Condensed Matter

Statement dc:rights

• Copyright 1991 Thorpe, John Clifton

Language dc:language

eng

Identifier

AAI9124500
(UMI)AAI9124500

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/23740