Is there any relationship between the value of lattice constant and pyrochlore phase?

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N. V. Chezhina

Look at the published works by I.V.Piir about pyrochlores, she has a large experience in their structure and parameters. I do not know what is the composition of your pyrochlore. Therefore I cannot answer your question, but it could depend on what sites the addition occupies.

Tapan Chatterji

How did you determine the lattice parameter? What are the standard deviations of these lattice parameter values?

Rodolpho Mouta

I believe it can be explained by the tolerance factor...

Our research group has developed an expression for it based only on the ionic radii of ions. We also showed that the tolerance factor can accurately predict not only the phase of the compound but also the lattice parameter of pyrochlores.

In the case where there is a partial substitution on B site, the ionic radius in the formula of the paper (see link below) should be replaced by the weighted mean of the ionic radii.

Article Tolerance factor for pyrochlores and related structures