Theory of cross phenomena and their coefficients beyond Onsager theorem

Cross phenomena, representing responses of a system to external stimuli, are ubiquitous from quantum macro scale. The Onsager theorem is often used describe them, stating that the coefficient matrix cross phenomena connecting driving forces and fluxes internal processes symmetric. Here we show this intrinsically diagonal when chosen gradients potentials drive their respective conjugate molar quantities in combined law thermodynamics including contributions processes. Various discussed terms present theory. https://doi.org/10.1080/21663831.2022.2054668