I mean, in articles, everyone refers to the piezoelectric charge constant d31 or the electromechanical coupling factor k33 or the piezoelectric voltage constant g15 and so on, as if it is the most natural notation in piezoelectricity to state the constants in function of the axes, as described here:
https://www.americanpiezo.com/knowledge-center/piezo-theory/piezoelectric-constants.html
In my view, it is not such a trivial notation that one can understand naturally without studying it. However, very rarely is any explanation given about this notation and the vast majority of articles begin to present piezoelectric constants without the slightest clarification of what they refer to. Even review articles! I already saw the notation of d11 and d33 in an article from 1934, therefore not recent at all:
https://doi.org/10.1063/1.1745214
But I cannot find a reference source where the convention of this notation is defined.
In short, I want to write "the coefficient d33 according to the notation by [citation X]." Is there any convention or standard that we can refer to?
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