Alan Ehrlich’s favorite structure is:

no one structure in particular

Why?

As a patent attorney, I often get rejections of patent applications by Examiners based on similarity of compositions in the prior art. Often, the
similarity is replacement of one component in a crystal with one of another component of different ionic radius or charge. I am usually successful in pointing out the strain on a crystal from such replacements such that the seeming similarity should not adversely affect patentability.—Alan Ehrlich

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