Accession Number : AD0663333

Title :   PHASE DIAGRAMS OF SYSTEMS OF HYDROGEN WITH TITANIUM, ZIRCONIUM, VANADIUM AND NIOBIUM,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Samsonov,G. V. ; Antonova,M. M.

Report Date : 17 JUL 1967

Pagination or Media Count : 14

Abstract : Phases of the systems titanium-hydrogen, zirconium-hydrogen, vanadium-hydrogen, and niobium-hydrogen with compositions ranging from no hydrogen to TiH1.93, ZrH2, VH0.915 and NbH at room temperature were studied by x-ray diffraction. The lower boundaries of the region of homogeneity of the beta-phase are shifted in a regular manner toward a lower hydrogen content on passing from titanium to niobium; this corresponds to the increase in the filling of the d-subhell of the corresponding transition metals. A satisfactory agreement between x-ray and pycnometric density values was found for the Zr-H and Nb-H systems; the discrepancy of these values in the Ti-H system is attributed to the fact that the hydrides studied were not in a state of equilibrium.

Descriptors :   (*HYDRIDES, *PHASE DIAGRAMS), (*TITANIUM COMPOUNDS, PHASE STUDIES), (*ZIRCONIUM COMPOUNDS, PHASE STUDIES), (*VANADIUM COMPOUNDS, PHASE STUDIES), (*NIOBIUM COMPOUNDS, PHASE STUDIES), REFRACTORY METALS, HYDROGEN, X RAY DIFFRACTION, ATOMIC ORBITALS, CRYSTAL LATTICES, USSR

Subject Categories : Properties of Metals and Alloys
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE