Abstract
In an earlier paper (Part I), the symmetry requirements for the secondary ferroic phenomena of ferrobielectricity, ferrobimagnetism and ferromagnetoelasticity and ferromagnetoelectricity were considered, and examples of materials illustrating the behavior discussed. In this second paper, the phenomena of ferrobielasticity and ferroelastoelectricity are considered. It is shown that there are 5 ferrobielastics, 15 ferroelastoelectric and 10 ferrobielastic-ferroelastoelectric species in which the primary ferroic effects are forbidden by symmetry. For α-quartz and other secondary ferroics it is suggested that the orientation of twin or domain walls which effect state switching under stress are dictated by strain compatibility between the contiguous domain states involved.
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