In zinc-blende II–VI alloys the thermal-expansion coefficient for low temperatures is negative and becomes positive at higher temperatures. We investigated the luminescence properties of molecular-beam-epitaxy-grown (CdMnMg)Te layers in the temperature range from 2 up to 200 K and show that the anomalous temperature dependence of the lattice constant is reflected in the luminescence properties of the excitonic recombination and the internal transition of manganese (ITM). The temperature behavior of the ITM energy is nonmonotonic and the existence of a minimum in the photon energy (at the temperature TMn) can be correlated to the change of sign of the thermal-expansion coefficient. The decay constants of the ITM begins to decrease drastically at TMn, too. Considering a lattice constant dependent energy transfer rate to the infrared emitting state (1.2 eV) of the manganese ion the variation of the lifetimes can also be explained by the temperature dependence of the lattice constant. Furthermore, we have measured the ITM in bulk layers and observed a different dependence of the ITM properties on the temperature, demonstrating the influence of the growing conditions on the microscopic surrounding of the manganese ions.

Atmospheric temperature range

Lattice constant

Temperature coefficient

Lattice (music)

10.1063/1.362496

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Citations (11)

Pressure and temperature derivatives of the elastic moduli of a machinable glass ceramic

Journal of Applied Physics (1978)

D. Gerlich Marcel Wolf

The elastic moduli and their temperature and pressure derivatives have been determined for a machinable glass ceramic. The behavior of the thermoelastic properties is similar to the case of crystalline solids, i.e., it possesses negative temperature and positive pressure derivatives. The specific heat evaluated from the elastic data is essentially equal to the measured specific heat over the range 2–20 K. The elastic Grüneisen constant is positive and constant over the range 0–400 K. The thermoelastic properties of the material are mainly determined by the included mica crystallites.

Thermoelastic damping

Atmospheric temperature range

Elasticity

10.1063/1.324690

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Citations (6)

Thermal expansion of cadmium fluoride

Journal of Physics and Chemistry of Solids (1976)

D. Shaharabany Marcel Wolf D. Gerlich

Atmospheric temperature range

Lattice constant

Constant (computer programming)