Titanium--, zirconium--, and hafnium--mercury systems

Journal Article · Mon Oct 01 04:00:00 EDT 1973 · Z. Metallk., v. 64, no. 10, pp. 711-715

OSTI ID:4358869

Lugscheider, E; Jangg, G

Vapor-pressure measurements and x-ray studies of titanium, zirconium, and hafnium amalgams yielded data for the clarification of the mercury--IVA metal systems. In the Ti--Hg system, the known compounds TiHg and Ti/sub 3/Hg were found. Ti/sub 3/Hg occurs only in one modification; the theta-Ti/sub 3/Hg phase, previously considered to be a high-temperature modification, is actually Ti/sub 3/ HgO. A further phase occurs in the Ti--Hg system which has two modifications with a transition temperature of about 300 deg C. Above 300 deg C, the phase encompasses a very broad composition region (from TiHg/sub 0.915/ to TiHg/sub 0.577/), and this region narrows markedly below 300 deg C. Adjacent to this, there apparently exists another phase, richer in mercury than TiHg, which decomposes peritectically at 128 deg C. In the Zr--Hg system, only the three previously recognized Zr--Hg compounds were observed, which are stable over large temperature ranges. Hafnium forms only one compound with mercury, Hf/sub 2/Hg, which decomposes peritectically at approxirnately 450 deg C. From the results of the vapor-pressure measurements, thermodynamic data for the mercury compounds of the IVA metals could be calculated. All compounds have relatively low heats of formation. (GE)

• Research Organization: Technische Hochschule, Vienna
• NSA Number: NSA-29-010718
• OSTI ID: 4358869
• Journal Information: Z. Metallk., v. 64, no. 10, pp. 711-715, Journal Name: Z. Metallk., v. 64, no. 10, pp. 711-715; ISSN ZEMTA
• Country of Publication: Germany
• Language: German

Related Subjects

FORMATION HEAT
HAFNIUM ALLOYS
INTERMETALLIC COMPOUNDS
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VAPOR PRESSURE
X-RAY DIFFRACTION TITANIUM ALLOYS
ZIRCONIUM ALLOYS