what are the reasons for a change in powder morphology in a pervoskite system (ABO3)...I replaced some amount of A(+1) with A(+2) after calcination, I have observed the change in morphology from cube like shaped to rod like shaped..what me the possible reason for change in morphology....(Image S1 is the material with A(+1) and S5 is the material with A(+2))
The ratio between A and B affcets the crystalographic structures, lattice constant and hence the growth shape. For example, if the lattice has changed from cubic to rhomboheral one expect to see a change in the crystals. moreover, might be that S1 is a crystal and S5 is amorphy. amorphous.
From your question it appears that you have changed the valency state of cation A in the two samples. If it is so then it is possible to have two different compounds after calcination, having the same cations. And if it is so then your crystal morphologies will be different. CONFIRM THRU XRD.
Also, if you are getting similar XRD patterns, still you can also have different morphology as your starting materials are different. CHECK, IN XRD SAME JCPDS FILE NO., AND INTENSITY OF THE PEAKS. PROBABLY PEAK HEIGHTS WILL BE DIFFERENT.
I completely agree with Amir Silber with respect to that, , the ratio between A and B affects the crystallographic structures, lattice constant and hence the growth shape. For example, if the lattice has changed from cubic to rhomboheral one expect to see a change in the crystals. moreover, might be that, S1 is a crystal and S5 is amorphous.
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