lect7-ceramicsandmetalbiomats

lect7-ceramicsandmetalbiomats - Lecture 7 Biomaterials...

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Lecture 7: Biomaterials Applications of Metals and  Ceramics in Biomaterials Last time, we discussed glasses and Piezoelectric  materials. This time: Finishing piezoelectric materials, and moving into  applications Piezoelectric Materials Pressure sensors, actuators and transducers—ABS breaking  systems Most common materials—Lead titanates PbTiO 3  often doped with zironia so that Pb(Ti, Zr)O 3 Perovskite crystal structure 1
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from  http://cst-www.nrl.navy.mil/lattice/struk/ perovskite.html The Ti 4+  does not fit snuggly so it distorts 0.04  Å This gives the structure a diapole A. Ferroelectric: move diapole  w/ mag field B. Piezoelectric: move with  electric field. Pressure leads  to change in voltage Likewise, a voltage will lead to a volume change 2 O 2- O 2- O 2- O 2- Ti shifts up  0.04  Å +++++++++++++++++ ------------------------------------
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High frequency speakers often use piezoelectrics
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