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Thermopower of Molten Aluminium in Ultrasonic Field

100%

Moraru L.

Acta Physica Polonica A

2003

vol. 104

issue 6

515-525

Temperature dependence on the liquid aluminium thermopower is reported for the range 933-1043 K. In order to highlight the ultrasonic wave effect on the thermoelectric power, the experiments were carried out under similar conditions with and without sonication. The lower values of the thermopower in sonication conditions are explained by the decrease in the melt temperature gradient and due to the specific effects of ultrasound propagation process (acoustic flow and acoustic cavitation). A functional relationship was found, Q=-A/T+BT, where A and B are positive constants. These two terms are regarded as electron-ion collisions and spatial redistribution of conduction electrons in the necessary temperature gradient. The effect of cavitation at high temperature is debated. A good agreement between the experimental data and theoretical models of the transport properties is achieved.

Density Functional Studies of Nonlinear Elastic Properties for Zinc-Blende Nitrides

80%

Łopuszyński M., Majewski J.

Acta Physica Polonica A

2007

vol. 112

issue 2

443-447

In this paper we present a method of calculating third-order elastic constants C_{ijk} and its application to zinc-blende nitrides AlN, GaN, and InN. Our approach is based on accurate ab initio calculations of both energy and stress as a function of applied strain. Ab initio computations are performed within density functional theory framework. To assess the reliability of the presented method, we compare our theoretical findings for GaAs with experimental results for C_{ijk} available for this material.

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2 Acta Physica Polonica A

1 2007

1 2003

1 Majewski J.

1 Moraru L.

1 Łopuszyński M.

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Thermopower of Molten Aluminium in Ultrasonic Field

Density Functional Studies of Nonlinear Elastic Properties for Zinc-Blende Nitrides