AN INVESTIGATION OF THE NEPTUNIUM-URANIUM EQUILIBRIUM DIAGRAM

Journal Article · Tue Dec 01 04:00:00 EST 1959 · J. Less-Common Metals

DOI:https://doi.org/10.1016/0022-5088(59)90063-3· OSTI ID:4141606

Mardon, P G; Pearce, J H

The general form of the neptunium--uranium phase diagram was determined by thermal analysis, dilatometry and x-ray techniques, usiag a very limited amount of neptunium. The results show that there is high solubility of uranium in the alpha and beta phases of neptunium and of neptunium in the alpha and beta phases of uranium; the room temperature solubility of neptunium in alpha - uranium has the unusually high value of 43 wt%. Some uncentainty exists as to whether or not there is complete solid solubility between gamma -neptunium and gamma -uranium but any miscibillty gap is definitely very restricted. There is one intermediate phase in the system, stable up to temperatures around 650 deg C and existing between 75 and 48 wt% neptunium at room temperature. Its crystal structure is simple cubic (a = 10.6 A) and it is isomorphous with the zeta phase in the plutonium--uranium system. (auth)

• Research Organization: Atomic Energy Research Establishment, Harwell, Berks, Eng.
• NSA Number: NSA-14-014088
• OSTI ID: 4141606
• Journal Information: J. Less-Common Metals, Journal Name: J. Less-Common Metals Vol. Vol: 1
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALLOTROPY
CRYSTALS
EXPANSION
HIGH TEMPERATURE
LATTICES
METALS, CERAMICS, AND OTHER MATERIALS
MIXING
NEPTUNIUM
NEPTUNIUM ALLOYS
NEPTUNIUM-ALPHA
NEPTUNIUM-BETA
NEPTUNIUM-GAMMA
PHASE DIAGRAMS
REACTION KINETICS
SOLID SOLUTIONS
SOLUBILITY
TEMPERATURE
THERMAL ANALYSIS
URANIUM
URANIUM ALLOYS
URANIUM- GAMMA
URANIUM-ALPHA
URANIUM-BETA
X RADIATION