77.00.00 Dielectrics, piezoelectrics, and ferroelectrics and their properties (for conductivity phenomena, see 72.20.-i and 72.80.-r; for dielectric properties related to treatment conditions, see 81.40.Tv)
77.65.-j Piezoelectricity and electromechanical effects
77.70.+a Pyroelectric and electrocaloric effects
77.80.-e Ferroelectricity and antiferroelectricity
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials (for nonlinear optical materials, see 42.70.Mp; for dielectric materials in electrochemistry, see 82.45.Un)
77.90.+k Other topics in dielectrics, piezoelectrics, and ferroelectrics and their properties (restricted to new topics in section 77)