Abstract
AbstractElectrical resistivity (4.2–800°K) and magnetic susceptibility (4.2–500°K) measurements are carried out on Cu3–xAs, Cu5–xAs2 and the recently obtained, tetragonal Cu2As. All three compounds appear to be metallic conductors, but have high residual resistances because of the large defect concentrations (resulting from non‐stoichiometry and preparation method). Cu3–xAs is diamagnetic; Cu5–xAs2 is Pauli‐paramagnetic; Cu2As has a very small, constant, positive susceptibility above room temperature and a more pronounced Curie‐Weiss behaviour at lower temperatures. The Pauli‐paramagnetic contributions have been estimated. A slight anomaly in the electric and magnetic behaviour of Cu3–xAs is observed at 220°K. To clarify the high‐temperature phenomena, a series of D.T.A. and X‐ray experiments has also been carried out.
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