Chapter VI ferroelectric and piezoelectric materials

The knowledge of ferroelectric materials continued to expand in a number of directions during 1954. Promising piezoelectric properties were found by a National Bureau of Standards group (97) in lead titanate-lead zirconate ferroelectrics. The most noteworthy development in research on barium titanate is a great increase of interest in the growth of single crystals. Structural data on Rochelle salt and KH2PO4, especially those obtained by neutron diffraction, continues to add to the store of fundamental knowledge of ferroelectrics.