Biomedical subjects

Henry P Scott

Publications and source records attributed to Henry P Scott.

2 recordsLinked to original sources

PubMed2004

Generation of methane in the Earth's mantle: in situ high pressure-temperature measurements of carbonate reduction.

We present in situ observations of hydrocarbon formation via carbonate reduction at upper mantle pressures and temperatures. Methane was formed from FeO, CaCO(3)-calcite, and water at pressures between 5 and 11 GPa and temperatures ranging from 500 degrees C to 1,500 degrees C. The results are shown to be consistent with multiphase thermodynamic calculations based on the statistical mechanics of soft particle mixtures. The study demonstrates the existence of abiogenic pathways for the formation of hydrocarbons in the Earth's interior and suggests that the hydrocarbon budget of the bulk Earth may be larger than conventionally assumed.

Journal Article↗

PubMed2001

Ultralow compressibility silicate without highly coordinated silicon.

The bulk modulus of scheelite-structured ZrSiO(4) is 301.4+/-12.5 GPa, as derived from static compression experiments to 52.5 GPa. It is as stiff as the most incompressible known silicate, SiO(2) stishovite. This high incompressibility indicates that octahedrally coordinated silicon is not required to generate ultrastiff silicates: ZrSiO(4) scheelite is the most incompressible material containing SiO(4) tetrahedra. Its incompressibility is in accord with a semitheoretical relation we derive for the bulk modulus of scheelite-structured materials. Based upon correlations between incompressibility and hardness, scheelite-structured oxides may thus represent a new family of ultrahard materials.

Journal Article↗