Rotor phases in compound semiconductors

Technical Report · Mon Oct 31 23:00:00 EST 1994

DOI:https://doi.org/10.2172/10104680· OSTI ID:10104680

Price, D L; Saboungi, M L ^[1]; Howells, W S ^[2]

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1. Argonne National Lab., IL (United States). Materials Science Div.
2. Rutherford-Appleton Lab., Chilton (United Kingdom)

Quasi-elastic neutron scattering is used to study the disordering processes in two classes of semiconductor: I-IV Zintl compounds and the phosphorus-selenium system. Two alkali-metal-polyvalent metal Zintl compounds, CsPb and NaSn, exhibit a two-stage melting process with high-temperature solid phases characterized by rapid dynamical disorder. In CsPb this disorder is clearly associated with rapid reorientations of polyanions with the cations participating in the dynamical disorder on the same time scale. In NaSn the disorder is associated with fast reorientations of the polyanions closely coupled to a slower migration of the cations. The two high-temperature solid phases of the molecular crystal P{sub 4}Se{sub 3} are confirmed to be rotor phases with small but significant differences in the reorientational motions in the two phases. Zintl compounds are formed from an electropositive metal A and an electronegative metal on semimetal M. Electron transfer from A to M, along with directional bonding between the M-ions, leads to chemical behavior in these ions characteristic of elements to the right of M in the periodic table.

• Research Organization: Argonne National Lab., IL (United States). Materials Science Div.
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10104680
• Report Number(s): ANL/MSD/CP--84837; CONF-9410165--9; ON: DE95004139
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602
CESIUM ALLOYS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
LEAD ALLOYS
PHASE STUDIES
PHASE TRANSFORMATIONS
PHOSPHORUS COMPOUNDS
QUASI-ELASTIC SCATTERING
SELENIUM COMPOUNDS
SEMICONDUCTOR MATERIALS
SODIUM ALLOYS
STRUCTURE AND PHASE STUDIES
TIN ALLOYS