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(A) Construction of a 30-MHz high-frequency linear array7. Copyright (2009), World Federation for Ultrasound in Medicine & Biology, reprinted with permission.
(B) SEM surface morphologies of (left) PZT after etching for 7 h and (right) PMN-PT after etching for 3 h10. Copyright (2015), 2015 Elsevier Ltd and Techna Group S.r.l., reprinted with permission.
