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Concentration Anomalies of Properties in Pb_{1-x}Ge_{x}Te Solid Solutions

100%

Rogacheva E., Sinelnik N., Nashchekina O.

Acta Physica Polonica A

1993

vol. 84

issue 4

729-732

The investigation of electrical conductivity, coefficient of thermal electromotive force, Hall coefficient, microhardness and mobility in Pb_{1-x}Ge_{x}Te (x = 0 ÷ 0.1) alloys in the temperature range of 77-300 K was carried out. Anomalies were detected in isotherms of properties in the vicinity of x = 0.008. The anomalies were treated as a manifestation of concentration phase transitions occurring in solid solutions of any kind and associated with existence of critical concentration (percolation threshold) at which the uninterrupted chain of interactions between impurity atoms is formed.

Defects of Non-Stoichiometry and Dynamic Stability of SnTe Crystal Lattice

88%

Rogacheva E., Sinelnik N., Nashchekina O., Popov V., Lobkovskaya T.

Acta Physica Polonica A

1993

vol. 84

issue 4

733-736

The temperature dependencies of coefficient of linear expansion α in the range of 4.2-300 K were obtained for SnTe samples with various degrees of deviation from stoichiometry. For the sample of stoichiometric composition in the α vs. temperature curves the anomalies connected with ferroelectric phase transition were detected. It was found that within cubic phase existence region α isotherms have a minimum at 50.4 at.% Te. Maximum dynamic stability at indicated composition is believed to be associated with the formation of vacancy superstructure.

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2 Acta Physica Polonica A

2 1993

2 Nashchekina O.

2 Rogacheva E.

2 Sinelnik N.

1 Lobkovskaya T.

1 Popov V.

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Concentration Anomalies of Properties in Pb_{1-x}Ge_{x}Te Solid Solutions

Defects of Non-Stoichiometry and Dynamic Stability of SnTe Crystal Lattice