From a macroscopic point of view, the interaction of caloric, mechanical and electrical quantities in a dielectric solid can be described using thermodynamics. If second-order effects are included in the considerations, the Taylor series expansion of the Gibbs energy function and the corresponding three equations of state become relatively lengthy. A visual representation is proposed that brings out the underlying symmetry of the interactions and serves to obtain a better overview. The proposed diagram is considered helpful in planning experiments in materials science and in analysing experiments, in which spurious effects might intervene.
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