Hexagonal-Orthorhombic Phase Transition and Ferroelasticity in K2SO4 and K2SeO4

View previous topic View next topic Go down

Hexagonal-Orthorhombic Phase Transition and Ferroelasticity in K2SO4 and K2SeO4

Post by Algerien1970 on Sat 23 May - 3:30


Hexagonal-Orthorhombic Phase Transition and Ferroelasticity in K2SO4 and K2SeO4

It is shown that (011) and (031) twin planes can be introduced in the orthorhombic phase of K 2 SO 4 and K 2 SeO 4 , and both twin planes can be moved smoothly through crystals by appropriate external stress in the temperature range from about 300°C to the orthorhombic-hexagonal phase transition point. It is inferred from the crystal structure in the orthorhombic phase that SO 4 - (or SeO 4 - ) radicals must have two stable states (the up and down states), and change from one state to another during the passage of twin planes. It is suggested that the space group of the hexagonal phase is D 6h 4 –P6 3 /mmc, and the hexagonal-orthorhombic phase transition is essentially due to the ordering of SO 4 - (or SeO 4 - ) radicals.


To see the link clik below :


[You must be registered and logged in to see this link.]

avatar
Algerien1970
Forum Manager
Forum Manager

Messages : 485
Date d'inscription : 2015-05-14

http://wien2k.forumalgerie.net

Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum