Orientational phase transitions in alloys. [CsPb; NaSn]

Conference · Tue Sep 22 04:00:00 EDT 1992

OSTI ID:7051854

Saboungi, M L; Johnson, G K; Price, D L

Plastic crystal behavior is observed in semiconducting CsPb and NaSn at high temperature (600 and 500 C, respectively). This behavior is associated with M{sub 4}{sup 4{minus}} or A{sub 4}M{sub 4} structural units orientationally disordering about 50 C below the melting point where translational disorder sets in. This orientational disorder is different in the two phases, exhibiting jump reorientations in CsPb and a more isotropic behavior in NaSn. In other Zintl compounds such as KPb, there is a single melting point where orientational and translational disorder sets in simultaneously; the classification of the different Zintl compounds into these two different kinds of behavior will require calorimetry or neutron diffraction below the melting point. (DLC)

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7051854
• Report Number(s): ANL/MSD/CP-77632; CONF-9206202--3; ON: DE93001702
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CESIUM ALLOYS
COHERENT SCATTERING
DIFFRACTION
DIRECT REACTIONS
INTERMETALLIC COMPOUNDS
LEAD ALLOYS
NEUTRON DIFFRACTION
NUCLEAR REACTIONS
ORDER-DISORDER TRANSFORMATIONS
PHASE STUDIES
PHASE TRANSFORMATIONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
SODIUM ALLOYS
STRUCTURE FACTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TIN ALLOYS