Spin-glass behavior of amorphousCo2Ge synthesized by mechanical milling

Spin glass behavior in Sr2Mn0.7Fe0.3MoO6

Spin glass behavior in FeAl2

Magnetic and transport measurements indicate FeAl2 to be an ordered intermetallic spin glass, with canonical behavior including a susceptibility cusp at T f535 K and frequency-dependent susceptibility below T f . The field-cooled and zero-field-cooled magnetization diverge below T f , with hysteresis characteristic of a spin glass. A resistivity minimum just above T f is explained in terms of c...

Hydrogen evolution activity of NiMo-MoO2 produced by mechanical milling

In this study, mechanical alloying was done by a high-energy planetary ball milling technique. A mixture of NiO and MoO3 and graphite powders were used as initial materials. After milling of powder mixture with 40 wt.% additional graphite, a temperature of 400, 550 and 1000 °C for 1 h was considered for the heat treatment of powder mixture. Also, powder mixtures containing 60, 80 and 100 wt.% a...

Spin-glass behavior of semiconducting KxFe2− yS2

We report the discovery of KxFe2−yS2 single crystals, isostructural to KxFe2−ySe2 superconductors. The sulfide compound is a small gap semiconductor and shows spin-glass behavior below 32 K. Our results indicate that stoichiometry, defects, and the local environment of FeCh (Ch = S,Se) tetrahedra have important effects on the physical properties of isostructural and isoelectronic KxFe2−yCh2 com...

DISORDERING OF FeAl BY MECHANICAL MILLING

Point defect concentrations in milled samples of stoichiometric FeAl were obtained by Mšssbauer measurements. Mšssbauer spectra consisted of a single absorption dip with broadening attributed to unresolved hyperfine interactions. A local environment model was used to analyze spectra that allowed for defect-induced changes in monopole interactions at Fe probe atoms due to elementary defects in t...