Paraelectricity is a phenomene, or rather "crystal phase", where electric dipoles are unaligned (i.e. unordered domains that are electrically charge) and thus have the potential to align in an external electric field and strength it. In comparison to ferroelectricity phase, the domains are unordered and the internal field is weak.
The LiNbO3 crystal is ferroelectric below 1430 K, and above this temperature it turns to paraelectric phase.
See also
