title: Pressure-Volume-Temperature Relations in Liquid and Solid Tritium.
abstract: PVTrelations in liquid and solid T2near the melting curve were measured over 20.5 K-22.1 K and 0 MPa-7 MPa (0 bar-70 bar) with a cell that used diaphragms for pressure and volume variation and measurement. Because of ortho-para self conversion, the melting pressurePmand the liquid molar volumeVlmincreased with time. The rates were consistent with a second order reaction similar to that forctheJ= odd concentration: [Formula: see text]wherek1= 6-9×l0-2h-1. By extrapolation, the ortho and para forms differed byΔPm~6 bar andΔVlm~0.5%. Measurements of the volume change on melting and the thermal expansion and compressibility for liquid T2were consistent with those for H2and D2. Impurities such as H2, HT, DT, and3He were removed by a technique using an adsorption column of cold activated alumina. Corrections for3He growth during an experiment were adequate except near the triple point.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, NM 87545.
authors.forename: E R
authors.initials: ER
authors.lastname: Grilly
keywords: PVT relations; deuterium; hydrogen; tritium