Photoacoustic characterization of a two-layer system

Abstract

A model for the effective thermal conductivity of metal-nonmetal particulate composites J. Appl. Phys. 111, 044319 (2012) Thermoelectric efficiency of topological insulators in a magnetic field J. Appl. Phys. 111, 07E319 (2012) Effective medium formulation for phonon transport analysis of nanograined polycrystals J. Appl. Phys. 111, 014307 (2012) On the accuracy of classical and long wavelength approximations for phonon transport in graphene J. Appl. Phys. 110, 113510 (2011) A study of the impact of dislocations on the thermoelectric properties of quantum wells in the Si/SiGe materials system J. Appl. Phys. 110, 114508 (2011) Additional information on J. Appl. Phys. In this paper the use of the so-called open photoacoustic cell for thermal characterization of two-layer systems of variable thickness is described. It is shown that the thermal diffusivity as well as the thermal conductivity are completely determined, based upon the effective sample model widely used in heat-transfer problems.

Effective Thermal Properties of Multilayered Systems with Interface Thermal Resistance in a Hyperbolic Heat Transfer Model

“…These facts indicate that for frequencies not so high, inside the interval of thermally thick layers, the interface thermal resistance plays an important role in the process of heat conduction [26][27][28]35,36]. For the hyperbolic model, in Fig.…”

“…Equation 33a has been previously obtained by Dramicanin et al [24]; in the absence of an interface thermal resistance, it reduces to the formula determined by Lucio et al [26], which is widely used in thermal characterization [26,27,36] under the framework of the parabolic model of heat conduction. Here, it is proved that Eq.…”

“…These systems have been studied in stationary and in dynamic heat transfer conditions [23][24][25][26][27][28]. By using the CV equation, Khadrawi et al [25] and Lor and Chu [29] have studied the thermal behavior of a two-layer system with perfect and imperfect thermal contact.…”

Photoacoustic studies on <bold>n</bold>-type InP

“…But in the case of materials with low thermal diffusivity, the thermoelastic bending may dominate and in such cases appropriate corrections have to be incorporated in the calculation. 19 Note also that in many OPC studies involving a variety of semiconductors, more complex phase behavior with a minimum in the phase plot is reported. [9][10][11][12][13][14][15][16][17] This nonlinear behavior of the phase data is attributed to surface and bulk recombination processes of photogenerated carriers in those materials.…”

Photothermal Thermoelastic Bending for Media with Thermal Memory

“…The development of these experimental techniques has caused the advance of different detection schemes, but theoretical models as well-the ones that help interpret and analyze various experimental data. Classical theories of the PA thermoelastic bending [3][4][5][6][7] have ignored implicitly, until now, the fact that the heat propagation velocity in solids is finite and that the thermal relaxation time does not equal zero [8][9][10][11][12][13][14][15][16][17][18][19][20][21], thus neglecting the presence of thermal memory properties [11,12] because they use classical heat conduction theory. There are several exceptions among models coping with the direct PA effect [18] and PT thermoelastic bending [19,20], which are based on some of the generalized theories of thermoelasticity [14][15][16][17], removing the nonphysicality of classical Fourier's theory of heat conduction [8].…”