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Maple, M. B.

Publications and source records attributed to Maple, M. B..

3 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Vanishing RKKY interactions in Ce-based cage compounds

Abstract We report the results of thermodynamic measurements in external magnetic field of the cubic Ce-based cage compounds Ce T 2 Cd 20 ( T = Ni,Pd). Our analysis of the heat-capacity data shows that the Γ 7 doublet is the ground state multiplet of the Ce 3+ ions. Consequently, for the Γ 7 doublet it can be theoretically shown that the Ruderman–Kittel–Kasuya–Yosida interaction between the localized Ce moments mediated by the conduction electrons, must vanish at temperatures much lower than the energy separating the ground state doublet from the first excited Γ 8 quartet. Our findings provide an insight as to why no long range order has been observed in these compounds down to temperatures in the milliKelvin range.

Physics↗
NASA NTRS1990

Catalysis of carbon monoxide methanation by deep sea manganate minerals

The catalytic activity of deep sea manganese nodule minerals for the methanation of carbon monoxide was measured with a microcatalytic technique between 200 and 460 degrees C. The manganate minerals were activated at 248 degrees C by immersion into a stream of hydrogen in which pulses of carbon monoxide were injected. Activation energies for the methanation reaction and hydrogen desorption from the manganate minerals were obtained and compared with those of pure nickel. Similar energy values indicate that the activity of the nodule materials for the reaction appears to be related to the amount of reducible transition metals present in the samples (ca. 11 wt.-%). Since the activity of the nodule minerals per gram is comparable to that of pure nickel, most of the transition metal ions located between manganese oxide layers appear to be exposed and available to catalyze the reaction.

Non-NASA Center↗