Scientists improved the performance of electricity-harvesting crystals by adding the rare earth metal samarium. Photo by Wikimedia Commons ============================================================ April 19 (UPI) -- Researchers have discovered that the addition of a rare earth metal significantly improves the performance of piezoelectric crystals. Piezoelectric crystals are used in sensors, including underwater sonars and medical ultrasound imaging devices. These technologies use perovskite oxide crystals, or PMN-PT crystals. Scientists have also tried to use piezoelectric crystals, which convert mechanical oscillations into electricity, to power wearable electronics and other types of novel technologies. An international team of scientists from Australia, China and the United States...