Infrared absorption of MgO at high pressures and temperatures: a molecular dynamic study.

United Nations Educational, Scientific and Cultural Organization and International Atomic Energy Agency THE ABDUS SALAM INTERNATIONAL CENTRE FOR THEORETICAL PHYSICS INFRARED ABSORPTION OF MgO AT HIGH PRESSURES AND TEMPERATURES: A MOLECULAR DYNAMIC STUDY

Near Infrared Absorption of Pure n - Heptane between 5000 c m 1 and 6500 em - 1 to High Pressures and Temperatures

The near infrared absorption of pure n-heptane between 5000 c m 1 and 6500 c m 1 was measured up to 250 °C and to pressures of 2000 bar. The procedure for measuring vibrational intensities at high pressures and temperatures with a precision of better than ± 1% is described. The integrated molar absorptivity of the combination mode va + vs of the methylene stretching fundamentals turns out to be...

Spectroscopic study of mutual solubilities of water and benzene at high temperatures and pressures.

Near-infrared and ultraviolet absorption of water-benzene mixtures has been measured at temperatures and pressures in the ranges of 323-673 K and 50-400 bar, respectively. Concentrations of water and benzene in both the water-rich phase and the benzene-rich phase of the mixtures were obtained from absorption intensities of near-infrared bands of water and benzene and ultraviolet bands of benzen...

Grain growth kinetic of spark plasma sintered magnesia

In this research, the densification of magnesia nanopowder with a mean particle size of about 100 nm was investigated by spark plasma sintering undera pressures of 80 MPa and at temperature range from 1000 °C to 1400 °C and a heating rate of 50 °C/min for 20 minutes. The density of the samples slowly increased with increasing sintering temperatures to 1200 °C. Afterwards, with more increasing o...

Infrared absorption of solid nitrogen at high pressures.

We have observed infrared absorption peaks in solid nitrogen at hydrostatic pressures as high as 7 GPa at liquid-helium temperatures. The shift in the AlSb:CSb local vibrational mode is used to precisely calibrate the pressure. For all measured pressures we also observe the n3 vibrational mode of CO2 impurities. For pressures greater than 1.9 GPa, a peak appears which we attribute to a N-N stre...