1. Some of smectic mesophase liquid crystals exhibit both ferro- electric and pyroelectric properties.

2. In this paper, the electrooptic effect of ferro- electic liquid crystals, device configurations, crystal orientation and main applications are reviewed.

3. Its output on ferro- sulfur mine is the second biggest in China, and vitriol the biggest.

4. Dependence of the critical exponent which denote the diffuseness on the tunneling frequency has been investigated with the eight-potential-well order-disorder ferro- electric model.

5. Moreover, current research in this field only focuses on the synthesis of ferro- or ferri-magnetic materials.