Twinned Li2B4O7 crystals have been successfully grown by the Czochrals
ki (CZ) method. Parameters necessary for the reproducible growth of tw
inned Li2B4O7 crystal have been also investigated. A piezoelectric bim
orph actuator using twinned Li2B4O7 crystal has been produced. It is c
onfirmed that this actuator shows an excellent linearity between the a
pplied voltage and displacement.