摘要:

Detailed studies of temperature dependences of critical shear stress and strain-rate sensitivity of deforming stress of Pb–Bi single crystals with 0.1–6.0 at. &percent; Bi are carried out in the temperature range 0.5–295 K. The deforming stress decrease during a superconducting transition of the sample is studied and the concentration dependence of the effect is measured. The ideas of a gradual transition (upon cooling) from thermally activated motion of dislocations through impurity barriers to the thermoinertial mechanism in the temperature range 10–25 K and further to the quantum-inertial motion at temperatures≲1 Kare developed. A detailed thermoactivation analysis of experimental data is carried out, and empirical estimates of internal stresses, dislocation–impurity interaction parameters, electron and phonon components of dynamic drag coefficient for dislocations are obtained. ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593640

出版商:AIP    

年代:1998

数据来源: AIP

摘要:

Equations of state are proposed for describing the isothermal compression of liquid argon. These equations are derived by the method of integral equations in the statistical theory of the condensed state of matter. The thermophysical data are analyzed for calculating the isotherms and parameters of molecular interaction potential. ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593641

出版商:AIP    

年代:1998

数据来源: AIP

摘要:

The compoundYbB12having a fluctuating valence is investigated by the EPR method. It is suggested that the valence fluctuation frequency of ytterbium ions&ngr;>1010 Hz.The electron excitation spectra reveal a gap of the order of 6–7 meV. ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593642

出版商:AIP    

年代:1998

数据来源: AIP

摘要:

It is proposed that the triangular antiferromagnetic &bgr;-structure precedes the triangular antiferromagnetic &agr;-structure observed inYMnO3by neutron diffraction studies at 4.2 K. The experimental observation of the anomalous behavior of the dielectric constant below Ne´el temperature is attributed to the phase transition between &bgr; and &agr; configurations. ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593643

出版商:AIP    

年代:1998

数据来源: AIP

摘要:

The influence of an intensive ultrasonic wave on the crystal structure ofPbI2was investigated. Acoustically stimulated phase transition have been observed for the first time. ©1998 American Institute of Physics.

ISSN:1063-777X    

DOI:10.1063/1.593644

出版商:AIP    

年代:1998

数据来源: AIP