Polar nanoregions , relaxor

Another exanple of this type of microstructure is provided by the relaxor ferroelectrics related to PbMgj Nb Oj. These have a structure described as consisting of polar nanoregions, coherently intergrown within the crystal matrix and sensitive to temperature (Section 6.7). Similarly, the oxide Sm, 8,5Ba3 is nominally... 

The NH- - -N-bonded crystals revealed yet another exeiting property of the hydrogen-bonded materials. In a typical ferroelectric crystal, domains of different spontaneous polarization are formed, as illustrated in Fig. 3a. Most recently also relaxor behaviour has been observed in the dabco monosalts [36]. In the relaxor materials, small nano-sized domains are formed, which have properties considerably different from the bulk of the crystal (see Fig. 3b). The structure of these domains may be different, although it should be stabilized by their surroundings. The properties of these nanoregions can considerably influence the macroscopic properties of the crystal, which despite the... 

Figure S (see color section). A schematic illustration of the domain structure in a ferroelectric crystal (a), and of a relaxor with the polarization of nanoregions pooled in one direction (b).

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