The change of tensor properties at ferroic phase transitions

Algebraic methods for calculation of material property tensors and their ch anges at ferroic phase transitions are reviewed. The central point of these methods is the application of tables of "tensorial covariants" and of abst ract tables of "fine domain structures". To facilitate the practical use of this information a software program was developed, the results of which ar e illustrated. In particular, tensor distinction of domain states is solved for all cases of completely transposable pairs.