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Thick domain boundaries in ferroelastic K2Mn2(SO4)3
crystals
Vlokh R., Vlokh O., Skab I.,*Uesu Y.
Institute of Physical Optics, Dragomanova str. 23, Lviv,
Ukraine
*Department of Physics, Waseda University,
3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8885, Japan
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The domain structure in the ferroelastic K2Mn2(SO4)3
crystals that undergo phase transition with the change of symmetry 23F222
was studied by the polarization microscope. It was found that domain structure
appeared at Tc= –76oC and exists in a whole temperature
region below Tc down to liquid nitrogen temperature. The observed domains
belong to two ferroelastic orientation states and were separated by thick
walls with average thickness of 50mkm. The region of the domain walls was
optically isotropic and belongs to the cubic paraelastic phase. These domain-phase
walls were parallel to the (110 )-plane and
are deviated from the mutually perpendicular positions by an angle ~19o.
doi 10.3116/16091833/2/3/148/2001 |
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