Neutron powder diffraction study of the ferroelastic phase transition and lattice melting in sodium carbonate, Na2CO3

1995 ◽  
Vol 7 (23) ◽  
pp. 4395-4417 ◽  
Author(s):  
I P Swainson ◽  
M T Dove ◽  
M J Harris
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
Sodium Carbonate ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
Ferroelastic Phase Transition

High Resolution Neutron Powder Diffraction Studies of the Ferroelastic Phase Transition in LaNbO4

1989 ◽  
Vol 166 ◽  
Author(s):  
W I F David
Keyword(s):  
Phase Transition ◽  
High Resolution ◽  
Powder Diffraction ◽  
Structural Phase ◽  
Strain Tensor ◽  
Neutron Powder Diffraction ◽  
Line Broadening ◽  
Neutron Powder Diffraction Data ◽  
Ferroelastic Phase Transition ◽  
Principal Axes

ABSTRACTAnalysis of high resolution neutron powder diffraction data of ferroelastic LaNbO4 indicates a monoclinic to tetragonal structural phase transition that is accompanied by anomalous line broadening. The origins of this line broadening have been investigated using a novel modification of the Rietveld technique. The results show that strain broadening is associated with the ferroelastic phase transition both above and below the transition temperature. This anomalous ‘microstrain’ is well-described by a second rank strain tensor, the principal axes of which are collinear with the spontaneous lattice strain. This phenomenon may be a general feature of proper ferroelastic phase transitions.

scholarly journals Antiferrodistortive phase transition in pseudorhombohedral (Pb0.94Sr0.06)(Zr0.550Ti0.450)O3: A combined synchrotron x-ray and neutron powder diffraction study

2012 ◽  
Vol 86 (17) ◽  
Author(s):  
Ravindra Singh Solanki ◽  
S. K. Mishra ◽  
Anatoliy Senyshyn ◽  
I. Ishii ◽  
Chikako Moriyoshi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
X Ray
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