SOLID-SOLID TRANSITIONS IN TITANIUM AND ZIRCONIUM AT HIGH PRESSURES
Journal Article
·
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
The body-centered cubic to hexagonal close-packed transformations in titanium and zirconium were studied by means of differential thermal analysis at pressures in the range 0--65 kbar and at cooling and heating rates of 3--5 deg C/ sec. The transitions occurred at different temperatures upon heating and upon cooling and these hysteresis intervals did not appear to vary much with increasing pressure and/or contamination. Alloying with the tantalum containers and consequent lowering of the transition temperatures was unavoidable in most of the experiments. The Ti transition decreases only slightly in temperature with increasing pressure; a zero pressure volume change of less than 0.3% is suggested. The Zr transition exhibits a slope of about --2.4 deg C/kbar until a new transition is encountered near 58 kbar; the transition from body-centered cubic to the new Zr polymorph is without much hysteresis, and the phase boundary exhibits a slope of about 0.6 deg C/ kbar. Discontinuities of about 17% in resistance at room temperature are detected near 51--59 kbar for Zr and 8090 kbar for Ti, there being a decrease for Zr and an increase for the resistance of Ti. (auth)
- Research Organization:
- Univ. of California, Los Angeles
- NSA Number:
- NSA-17-027871
- OSTI ID:
- 4696050
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 131; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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