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An Energy-Based Cohesion Function for Cubic Equations of State

Figueira F., Rodríguez A., Stamateris B., Olivera-Fuentes C.

Polish Journal of Chemistry

2006

Vol. 80, nr 1

81-97

Acohesion function is derived for cubic equations of state of van derWaals type, based on the behaviour of the residual internal energy of pure fluids; it contains two fluid-specific constants and is therefore suitable for nonpolar and polar fluids. The characteristic constants are obtained for the van derWaals, Redlich-Kwong and Peng-Robinson equations for 846 fluids by fitting cohesion parameters computed from vapour pressures taken from the DIPPR database. Comparison with similar functions proposed in the literature shows that the new function is generally better. A corresponding states generalization is presented using the acentric and critical compressibility factors.

Characterization of InGaN structures grown by epitaxial lateral overgrowth over a-plane GaN template

Miasojedovas S., Jursenas S., Kuokstis E., Zukauskas A., Gaevski M.E., Lee J., Shatalov M., Gong Z., Adivarahan V., Sattu A., Mokina I., Yang J., Asif Khan M.

Optica Applicata

2006

Vol. 36, nr 2-3

351-358

We report on the luminescence characterization of InGaN/GaN multiple quantum well (MQW) structures with average 15% In content in the well layers, grown on polar and non-polar sapphire substrates utilizing epitaxial lateral overgrowth (ELOG) technique. Significant modification of the emission properties of MQWs grown over non-polar ELOG structure in comparison with non-polar orientation was observed. It was attributed to the formation of In-rich quantum dot like structures in the vicinity of substrate related defects along stripes formed during ELOG procedure. The absence of the stimulated emission and the significant reduction of carrier lifetime, observed under strong excitation, indicate the high density of nonradiative centers in the In-rich quantum dot regions of non-polar ELOG MQWs.