A special phase transition, the phase transition of ergodic space shrinking
in succession (abbreviated as ES3 phase transition), is proposed according
to the freezing process of the ordered microregion dipoles fn relaxors. It
s features are discussed. The special characteristics of relaxors are expla
ined from the viewpoint of the ES3 phase transition. (C) 1999 Elsevier Scie
nce B.V.