Percolation Effects in Semiconductor IV‐VI – Based Solid Solutions and Thermoelectric Materials Science

Рогачева, Е. И.; Nashchekina, O. N.

doi:10.1002/9781119407348.ch9

Cited by 11 publications

(3 citation statements)

References 42 publications

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“…Earlier in the study of concentration dependencies S and σ cast and cold-pressed samples of the system Bi 2 (Te 1-x Se x ) 3 , the authors of this study observed anomalies of properties near the composition x = 0.01, the presence of which was associated with the phase transition (PT) from diluted to concentrated solid solution [13]. Similar anomalies were observed earlier in [14] for a large number of solid solutions. Additional evidence in favour of this assumption was the discovery in [15] of a peak on the concentration dependence of heat capacity C. If such a PT occurs, it would certainly also affect the concentration dependence of λ, and, accordingly, the nature of the Z(x) dependence.…”

Section: Introductionsupporting

confidence: 84%

“…As in previous studies [13], it is advisable to associate these transformations with the implementation of PT from diluted to concentrated solid solution. The likely mechanism for implementing these processes is described in detail in the review paper [14], which also provides a number of experimental confirmations of this hypothesis. A more detailed description of these effects in relation to SS of Bi 2 (Te 1-x Se x ) 3 is given in [13; 15].…”

Section: Resultsmentioning

confidence: 76%

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Thermal conductivity of solid solutions of Bi2(Te1-xSex )3 (x = 0-0.07)

Martynova¹,

Rogacheva²

2022

Scientific Herald of Uzhhorod University Series Physics

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Relevance. Solid solutions Bi2 (Te1-xSex )3 are effective materials for an n-leg of thermoelectric cooling devices. Recently, concentration anomalies of properties with a low impurity content were detected in these solid solutions (x ~0.01). It is important to establish whether similar anomalies would be observed on the dependence of thermal conductivity λ from the composition of the solid solution, since λ is one of the parameters that determine the thermoelectric quality factor of the material. Purpose. The purpose of this study was to investigate the concentration dependences of the thermal conductivity of the solid solution of Bi2 (Te1-xSex )3 in the interval x = (0-0.07) to identify concentration anomalies and their possible impact on thermoelectric (TE) efficiency. Methodology. Investigation of temperature dependences of thermal conductivity λ was performed by a dynamic calorimeter. Isotherms of λ for different temperatures in the range T = 175-400 K were built on their basis. Results. On isotherms of λ, there is an interval of abnormal growth λ, which becomes more pronounced when the temperature decreases. The presence of this interval is associated with critical phenomena that accompany the transition of the percolation type from dilute to concentrated solid solutions. Conclusions. The estimation of the thermoelectric figure of merit Z of materials is given. It is shown that the detected growth of λ leads to a decrease in Z in the ranges near the critical (x = 0.01), which should be considered in the practical use of solid solutions of Bi2 (Te1-xSex )3

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Section: Introductionsupporting

confidence: 84%

Section: Resultsmentioning

confidence: 76%

Thermal conductivity of solid solutions of Bi2(Te1-xSex )3 (x = 0-0.07)

Martynova¹,

Rogacheva²

2022

Scientific Herald of Uzhhorod University Series Physics

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“…From our point of view [6] the appearance of concentration anomalies of properties in the range of small impurity content represents the universal physical phenomenon associated with the formation of percolation channels in impurity subsystem of crystal upon attaining percolation threshold [7].…”

Section: Resultsmentioning

confidence: 99%

Mechanical and Thermoelectric Properties of PbSe_1-xTe_x Solid Solutions

Vodoriz¹,

Tavrina²,

Rogachova³

2018

ELIT-2018

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The microhardness, Seebeck coefficient and electrical conductivity of PbSe 1-x Te x (x = 0-0.045) solid solutions were investigated at room temperature. In the range of small concentrations of PbTe (in the vicinity of x = 0.01 and x = 0.02) an anomalous decrease in microhardness, increase in Seebeck coefficient and electrical conductivity were registered. The concentration anomalies were interpreted as the transition from diluted to concentrated solid solutions when the interaction between impurity atoms starts to make a significant contribution to the change of the properties of materials.

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