Influence of doping on thermal diffusivity of single crystals used in photonics: measurements based on thermal wave methods

Bodzenta, Jerzy; Kaźmierczak-Bałata, Anna; Wokulska, K.; Kucytowski, J.; Łukasiewicz, T.; Hofman, W.

doi:10.1364/ao.48.000c46

Cited by 5 publications

(10 citation statements)

References 16 publications

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“…So at 300 K, the lattice constant is 12.43Å which is 3.6% greater than published figures [14] but only 0.6% greater than the result from MD simulations of Reference [15]. However, we can not validate the linear thermal expansion coefficient for gallium gallium-substituted YAG, and these values should be questioned.…”

Section: Resultscontrasting

confidence: 68%

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Thermal Properties of Yttrium Aluminum Garnett From Molecular Dynamics Simulations

al-Dosari

Walker

2011

ASME/JSME 2011 8th Thermal Engineering Joint Conference

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Yttrium Aluminum Garnet (YAG, Y3Al5O12) and its varieties have applications in thermographic phosphors, lasing mediums, and thermal barriers. In this work, thermal properties of crystalline YAG where aluminum atoms are substituted with gallium atoms (Y3(Al1−xGax)5O12) are explored with molecular dynamics simulations. For YAG at 300K, the simulations gave values close to experimental values for constant-pressure specific heat, thermal expansion, and bulk thermal conductivity. For various values of x, the simulations predicted no change in thermal expansion, an increase in specific heat, and a decrease in thermal conductivity for x = 50%. Furthermore, the simulations predicted a decrease in thermal conductivity with decreasing system size.

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Section: Resultscontrasting

confidence: 68%

“…The conventional unit cell of YAG contains 160 atoms comprising of 24 yttrium, 40 aluminum, and 96 oxygen atoms; with a lattice parameter of 12.01Å [14]. The relative arrangement of Y, O, and Al can be described with polyhedra as shown in Figure 2, while the symmetry can be seen in Figure 1.…”

Section: Yag Modelmentioning

confidence: 99%

Thermal Properties of Yttrium Aluminum Garnett From Molecular Dynamics Simulations

al-Dosari

Walker

2011

ASME/JSME 2011 8th Thermal Engineering Joint Conference

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“…So, the thermal diffusivity is directly related to quantities describing phonon kinetics in a system. It followed from our previous investigations that the influence of dopants on the ultrasound velocity in crystals is rather low [12]. So, changes in the thermal diffusivity are mainly caused by changes in the phonon scattering rate.…”

Section: Resultsmentioning

confidence: 94%

Determination of Thermal-Diffusivity Dependence on Temperature of YAG Single Crystals with Different Concentrations of Yb3+ and V3+ Doping Ions

et al. 2012

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Thermal diffusivities of pure and doped yttrium aluminum garnet single crystals were measured as a function of temperature. Samples doped with rare earth ions (3 at% and 25 at% of Yb 3+ , and 0.8 at% and 2.1 at% of V 3+ ) were investigated in the temperature range from 34 • C to 300 • C. Determination of the thermal diffusivity was based on an analysis of propagation of a thermal wave in the sample. The frequency of the thermal wave was 100 mHz. A temperature disturbance connected with the thermal wave propagating in the sample was detected using the mirage effect. The results showed that the thermal diffusivity of all investigated samples decreases with an increase of sample temperature. A drop in the thermal diffusivity is more pronounced for pure and low-doped crystals.

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“…Only for LiNbO 3 crystals lightly doped with Cu and Fe the thermal diffusivity remains practically unchanged (taking into account the measuring uncertainties). More detailed analysis of these results including consideration of possible mechanisms of the influence of dopants on the thermal diffusivity can be found elsewhere [28].…”

Section: Measurement Of the Thermal Diffusivity Of Transparent Materialsmentioning

confidence: 99%

Photothermal methods for determination of thermal properties of bulk materials and thin films

2010

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Abstract:Information on the thermal properties of materials is very important both in fundamental physical research and in engineering applications. The development of materials with desirable heat transport properties requires methods for their experimental determination. In this paper basic concepts of the measurement of parameters describing the heat transport in solids are discussed. Attention is paid to methods utilizing nonstationary temperature fields, especially to photothermal methods in which the temperature disturbance in the investigated sample is generated through light absorption. Exemplary photothermal measuring techniques, which can be realized using common experimental equipment, are described in detail. It is shown that using these techniques it is possible to determine the thermal diffusivity of bulk transparent samples, opaque and semi-transparent plate-form samples, and the thermal conductivity of thin films deposited on thick substrates. Results of the investigation of thermal diffusivity of the ground in the polar region, which is based on the analysis of the propagation of the thermal wave generated by sun-light, are also presented. Based on chosen examples one can state that photothermal techniques can be used for determination of the thermal properties of very different materials.

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Influence of doping on thermal diffusivity of single crystals used in photonics: measurements based on thermal wave methods

Cited by 5 publications

References 16 publications

Thermal Properties of Yttrium Aluminum Garnett From Molecular Dynamics Simulations

Thermal Properties of Yttrium Aluminum Garnett From Molecular Dynamics Simulations

Determination of Thermal-Diffusivity Dependence on Temperature of YAG Single Crystals with Different Concentrations of Yb3+ and V3+ Doping Ions

Photothermal methods for determination of thermal properties of bulk materials and thin films

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