Zvyagina G. Elastic properties of ferroelastics in the vicinity of phase transitions

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0404U003772

Thesis Registration Form

0404U003772.pdf

Applicant for

Specialization

  • 01.04.07 - Фізика твердого тіла

05-10-2004

Specialized Academic Board

Д 64.175.03

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine

Essay

Object - ferroelastic phase transitions in double molibdates and cuprates of rare-earth and transition elements; goal -the analysis of mechanisms and characters of ferroelastic phase transitions occursing in this layered compounds; method - pulsing ultrasonic; results and novelty -elastic properties KSc(MoО4)2, СsDу1-xGdx(MoО4)2, KEr(MoО4)2 and Nd2-xCexCuО4 in a broad range of temperatures and magnetic fields were investigated, and the analysis of features of the be-havior of those compounds at ferroelastic phase transitions was performed. The phase diagram "concentration of rare-earth ions-temperature" for of crystals СsDу1-xGdx(MoО4)2 was con-structed. For the first time spontaneous and magnetic field-induced phase transitions at low temperatures in Nd2-xCexCuО4 were found. Phase diagrams "magnetic field-temperature" were constructed for a pure crystal and doped ones; employment - investigation of fundamental physical properties, new ferroelastic materials.

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