Please have a look at the attachment

and/or at:

https://en.wikipedia.org/wiki/Moir%C3%A9_pattern

So you might have got simultaneously two sets of lattice configurations (a, b), (a, c) or (b, c) as displayed in the attachment.

In addition please imagine that you have got different periodicities (lattice constants) in x and y direction.......(please have a look at the second attachment)

By the way; you may share your Moiré pattern....

Hi Jain,

As far as I know, also according to my experiences, two lattices only generate one type of Moire pattern. Maybe there is more than one secondary phase,or maybe some kind of coreshell structure come out with increasing dopant content.

I suggest you do some statistical analysis. Also you may use EDS or EELS to check whether there is more than one secondary phase precipitated together in samples with relatively high dopant content.

Best,

Chunyang

You could try analysing your high resolution images using Fast Fourier Transforms (FFT). If you're looking at the micrographs using Digital Micrograph there is a drop-down option that allows you to get FFT's from your already collected image. You can also use the region of interest tool to select specific areas of your image to analyse using the FFT. This will give you detail of the symmetry within the image (very similar but subtly different to collecting diffraction patterns). And you can use this symmetry information to determine how many crystal phases you are looking at.

Good luck.

Different orientation between those two lattices can creat different Moire patterns, if considering the dynamic diffraction effect in the sample.

Hello Dr. Wang

I am also thinking of the same possibility of having another secondary phase. Thanks for the further suggestion.

Robert D Aughterson

Thanks Sir.

Gerhard Martens Thanks Sir.