The susceptibility-temperature relation for the antiferromagnetic compound MnSe was measured over a range of temperatures between 70°C and -196°C. Evidence was found of a large thermal hysteresis and a dependence of susceptibility on field strength. A tentative theory is advanced to explain the thermal hysteresis in terms of three phases which possess different susceptibilities.
EuzRuHe is formed by allowing EuHz and Ru to react at 800°in approximately 1 atm of hydrogen. The ternary hydride is a dark red, air-stable crystalline solid which appears to be thermally stable to 900°. An analysis of X-ray powder diffraction data and density measurements suggests that the structure is consistent with the Fmlm space group wherein the ruthenium atoms assume fourfold occupancy and europium atoms assume eightfold occupancy in a fluorite type lattice. Magnetic susceptibility measurements between 77 and 296°K show that EuzRuHe obeys a Weiss-Curie law with = +43°K indicative of ferromagnetic interactions. The measured effective magnetic moment for the europium ion in EuzRuHe is 7.82 BM assuming no contributions from the ruthenium and hydrogen. This suggests the europium ions are divalent based on a comparison with a calculated value of 7.94 BM for S = 1 /i. Electrical resistivity measurements indicate that EuzRuHs behaves as a semiconductor.
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