Misleading title... (Score 3, Informative)

FTFA, The researchers have found a replacement for Lead zirconate titanate not LEAD. PZT is a piezoelectric material that contains lead and is used to make actuators and transducers in microelectronics industry. The article itself is pretty poor describing piezoelectric materials as a "switch", so perhaps it is not the fault of the readers for thinking this was a replacement for lead based solders.