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Once More About the “Forbidden” Domain Structure and
the Isolated Point in K2Cd2xMn2(1-x)(SO4)3 Langbeinites
1Vlokh R., 1Girnyk I., 1Vlokh O.V.,
1Skab
I., 1SayA., 2Uesu Y.
1Institute of Physical Optics, 23 Dragomanov
St., 79005 Lviv, Ukraine
2Department of Physics, Waseda University,
3-4-1 Okubo, Shinjuku-ku, Tokyo-160, Japan
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The domain structure in K2Cd2xMn2(1-x)(SO4)3 (x=0.5, 0.7 and 0.9) langbeinite
crystals is studied with the aid of optical polarization microscopy. It
is shown that the domain walls in ferro-elastic langbeinites separate enantiomorphous
orientation states. These orientation states appear in the phase with the
symmetry 23 in connection with the hypothetic phase transition .
In the phase with the symmetry 222, these domain walls are transformed
to those separating ferroelastic domains with the opposite signs of enantiomorphism.
It is revealed that one enantiomorphous domain can only transform to the
other via a thick layer of the parent phase with symmetry.
The results for the volume thermal expansion are presented. It is shown
that the isolated point at the x,T-phase diagram of K2Cd2xMn2(1-x)(SO4)3
solid solutions corresponds to the concentration x=0.6.
PACS: 42.25.Lc, 77.80.Dj .
Key words: domain structure, high-order ferroics, ferroelastics,
enantiomorphism, isolated point, thermal expansion.
doi 10.3116/16091833/5/4/141/2004 |
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1. Vlokh R, Uesu Y, Yamada Y, Skab I, Vlokh OV, 1998. J. Phys. Soc. Jap.
67: 3335.
doi:10.1143/JPSJ.67.3335
http://dx.doi.org/10.1143/JPSJ.67.3335
2. Vlokh R, Kabelka H, Warhanek H, Skab I, Vlokh OV, 1998. Phys. Stat.
Sol.(a) 168: 397.
doi:10.1002/(SICI)1521-396X(199808)168:2<397::AID-PSSA397>3.0.CO;2-S
http://dx.doi.org/10.1002/(SICI)1521-396X(199808)168:2<397::AID-PSSA397>3.0.CO;2-S
3. Vlokh R, Skab I, Vlokh O, Uesu Y, 2001. Ukr. J. Phys. Opt. 2: 148.
doi:10.3116/16091833/2/3/148/2001
http://dx.doi.org/10.3116/16091833/2/3/148/2001
4. Sapriel J, 1975. Phys. Rev. B 12: 5128.
doi:10.1103/PhysRevB.12.5128
http://dx.doi.org/10.1103/PhysRevB.12.5128
5. Vlokh R, Vlokh O, Kityk A, Skab I, Girnyk I, Czapla Z, Dacko S,
Kosturek B, 2000. Ferroelectrics 237: 481.
6. Vlokh R, Czapla Z, Kosturek B, Skab I, Vlokh OV, Girnyk I, 1998.
Ferroelectrics 219: 243.
7. Smolenskiy G.A. et al. Physics of Ferroelectric Phenomena. Leningrad,
Nauka, (1985) 396p. (in Russian).
8. Vlokh R, Skab I, Girnyk I, Czapla Z, Dacko S, Kosturek B, 2000.
Ukr. J. Phys. Opt. 1: 28.
doi:10.3116/16091833/1/1/28/2000
http://dx.doi.org/10.3116/16091833/1/1/28/2000
9. Brezina B, Rivera J-P, Schmid H, 1984. Ferroelectrics 55: 177.
10. Vlokh R, Skab I, Vlokh O, Yamada Y, 2000. Ferroelectrics 242: 47.
11. Vonsovsky SV, 1971. Magnetism, Moscow, Nauka . |