Electrical resistivity of some Zintl phase and the precursors

Technical Report · Fri Sep 21 00:00:00 EDT 1990

DOI:https://doi.org/10.2172/6824583· OSTI ID:6824583

Wolfe, L

Resistivity measurements have been performed for electric characterization of the compounds Ba{sub 5}Sb{sub 3} and Ba{sub 5}Sb{sub 3}Cl, both with the Mn{sub 5}Si{sub 3} structure type, along with Ca{sub 5}Bi{sub 3} and Ca{sub 5}Bi{sub 3}F, both with the {beta}-Yb{sub 5}Sb{sub 3} structure type. These measurements were taken as a function of temperature using the four probe method on pressed polycrystalline pellets of the compounds. A sealed apparatus was developed for containing these air-sensitive compounds throughout the experiments. By a simple electron count, one extra electron in both Ba{sub 5}Sb{sub 3} and Ca{sub 5}Bi{sub 3} should occupy a conduction band, giving these compounds a metallic character. In the cases of Ba{sub 5}Sb{sub 3}Cl and Ca{sub 5}Bi{sub 3}F, the extra electron should bond to the halide, both filling the valence band and giving rise to semiconducting character. Ca{sub 5}Bi{sub 3}, Ca{sub 5}Bi{sub 3}F, and Ba{sub 5}Sb{sub 3}Cl were found to comply with the electron count prediction. Ba{sub 5}Sb{sub 3}, however, was found to be a semiconductor (E{sub g} = 0.30 eV) with a larger band gap than its corresponding chloride (E{sub g} = 0.09 eV).

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6824583
• Report Number(s): IS-T-1445; ON: DE91000742
• Resource Relation: Other Information: Thesis (M.S.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIMONY COMPOUNDS
ELECTRIC CONDUCTIVITY
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHLORINE COMPOUNDS
FLUORINE COMPOUNDS
BOND LENGTHS
CRYSTAL STRUCTURE
INDIUM COMPOUNDS
INTERMETALLIC COMPOUNDS
LATTICE PARAMETERS
SYNTHESIS
YTTERBIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
DIMENSIONS
ELECTRICAL PROPERTIES
HALOGEN COMPOUNDS
LENGTH
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
360603* - Materials- Properties