Upon cooling from the smectic A phase at 55 degree celsius, a tiny transition bars is observed across the fan-shaped boundaries. Further mechanical disturbance is induced, but the fan-shaped remained firm and does not change. So, whether it is assigned a soft crystal B phase or hexatic B phase. Attached is the XRD pattern obtained when cooling at 50 degree celsius.
Sanjoy Paul
Please read my paper in which I identified Soft Crystal SmB due to appearance and disappearance of transition bars..
http://scitation.aip.org/content/aip/journal/jap/118/13/10.1063/1.4931913
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