Orientational phase transitions in alloys. [CsPb; NaSn]
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
Similar Records
Melting in alkali-metal--lead alloys: KPb and CsPb
Rotor phases in compound semiconductors
Related Subjects
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