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dependence of a thermal conduction and temperaturoprovodnosti from concentration of an impurity (antimony)

Germanium crystals «-type with concentrations of an impurity 6-JU13, 1.3∙10l4, 1.7∙1014, 3.7∙1014и 6-JU14 sm ' 3 (that corresponds to a specific resistance 30, 15, 7.5, 4 and 2.5 Ohm-sm) are explored.

Samples of monocrystal germanium had the size 5x10x10 mm (surfaces IOxIOmm2 corresponded to a crystallographic plane {111}).

On fig. 4.12 it is presented pirootklik TL, registered with use of the analogue-digital transformer at passage of a temperature wave through samples of crystals of germanium with different concentration of an impurity.

Fig. 4.12. Pirootklik crystal TL, at passage of a temperature wave through the sample of a crystal of germanium with a specific resistance 30 (a curve 1),

15 (a curve 2), 7.5 (a curve 3), 4 (a curve 4) and 2.5 (a curve 5) the Ohm-see Frequency of modulation of a thermal stream / = 0.1 Hz

Fig. 4.13. Observational (1) and settlement (2) shapes pirootklika TL5 at passage of a temperature wave through samples of germanium with a specific resistance 30 (), 15 (), 7.5 (), 4 () and 2.5 () the Ohm-see

As quantity of a pyroelectric current is directly proportional to change of temperature of a ferroelectric material, and in case of the modulated change of temperature - densities of the thermal stream which is heating up a surface of the sample in quantity and the shape pirootklika it is possible to explain observable distinction distinction of thermal conductivities
And temperaturoprovodnosti samples of germanium with different concentration of an impurity of antimony.

For a quantitative assessment of values of thermal performances comparison of the observational shapes pirootklikov with settlement (fig. 4.13) has been spent.

Values teplofizicheskih performances at which settlement shapes pirootklika have coincided with observationally observed, are given in table 4.11. As it is possible to see from the presented effects, thermal conductivities and temperaturoprovodnosti monocrystals of germanium of/7-type decrease with growth of concentration of an impurity of antimony (fig. 4.14).

Table 4.11. Teplofizichesky performances of germanium of n-type of crystallographic orientation [111]

Concentration

Impurities Sb, sm ’ 3

Thermal conductivity, Vt/m-K Coefficient of thermal diffusion, M2∕c
6-JU13 44 7.0 ∙ 10 ’ 6
1.31014 36 5.5 ∙∣ (Γ ' 1
1.7∙1014 32 3.5∙10^t,
3.7∙1014 30 3.5∙10^t,
6-JU14 27 2.8 ∙ 10 ’ 6

It is possible to explain dependence of a thermal conduction of germanium of//-type observed in experiment on concentration of an impurity as follows. At a heating of a surface of a solid body the lapse rate of temperature [251] guided from the shined surface to back (which in the conditions of our experiment it is located immediately on TL) exists the modulated thermal stream, in the sample. In this connection in sample Ge there should be thermal a motion of minority carriers of a charge (in this case electrons), guided to an opposite side (towards to distribution to the sample of a temperature wave). The given fact
Also can serve as the parent of observable reduction of a thermal conduction and temperaturoprovodnosti samples with bolshej concentration of an impurity.

Fig. 4.14. Dependence of a thermal conduction () and temperaturoprovodnosti () germanium monocrystals p - type from concentration of an impurity of antimony

4.5.

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A source: Gavaljan Mamikon JUrevich. Influence of crystallographic orientation and the impurity composition on optical, the dielectric and teplofizicheskie performances of crystals of germanium and paratellurita. The dissertation on competition of a scientific degree of the candidate of physical and mathematical sciences. Tver - 2016. 2016

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