In Situ Observation of Relativity between Domain and Indentation Crack Propagating in Barium Titanate Single Crystal
BaTiO3单晶压痕裂纹的畴变和裂纹扩展的原位观察

Instant electric field-induced 90 domain switching, crack initiation and propagation in a poled BaTiO3 single crystal, as well as sustained field-induced indentation crack propagation and 90 domain switching in an unpoled BaTiO3 single crystal have been investigated in situ using optical microscopy. The results show that 90 domain switching is a prerequisite for instant field-induced crack initiation and propagation, but that is no direct relation between the site of crack initiation and propagation and the domain switching zones. Delayed propagation of unloaded indentation crack under sustained field can result in enlargement of the indent ation-induced 90 domain switching zones.