Relaxor ferroelectric single crystals for ultrasound transducers
First Claim
1. A transducer comprising single crystals of a lead zinc niobate--lead titanate solid solution and exhibiting at least an 85% longitudinal coupling, wherein said single crystals of lead zinc niobate--lead titanate solid solution have a composition represented by the formulae:
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space="preserve" listing-type="equation">Pb(Zn.sub.1/e Nb.sub.2/3).sub.l-x Ti.sub.x O.sub.3where;
x is within the following limits;
0.02<
x<
0.05.
2 Assignments
0 Petitions
Accused Products
Abstract
<001>oriented crystals of lead zinc niobate--lead titanate solid solution (0 to 5 mole % lead titanate) have high electromechanical coupling>85% and exhibit electric field induced phase transition at electric field levels>10×Ec (where Ec is the coercive field), resulting in increased transducer driving voltages, decreased fabrication degradation, and high sensitivity/large bandwidth transducer characteristics due to high electromechanical couplings, up to 92%. <001>oriented crystals of lead magnesium niobate--lead titanate solid solution (20 to 50 mole % lead titanate) also exhibit high electromechanical couplings>85% and up to 94%, and thereby can be formed into transducers which exhibit both high sensitivity and large bandwidth.
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Citations
7 Claims
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1. A transducer comprising single crystals of a lead zinc niobate--lead titanate solid solution and exhibiting at least an 85% longitudinal coupling, wherein said single crystals of lead zinc niobate--lead titanate solid solution have a composition represented by the formulae:
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space="preserve" listing-type="equation">Pb(Zn.sub.1/e Nb.sub.2/3).sub.l-x Ti.sub.x O.sub.3where;
x is within the following limits;
0.02<
x<
0.05. - View Dependent Claims (2)
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3. A transducer comprising single crystals of lead magnesium niobate--lead titanate, wherein said single crystals of lead magnesium niobate--lead titanate solid solution have composition represented by the formulae:
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space="preserve" listing-type="equation">Pb(Mg.sub.1/3 Nb.sub.2/3).sub.l-y Ti.sub.y O.sub.3where y is within the following limits;
0.20<
y<
0.50. - View Dependent Claims (4, 5, 6, 7)
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Specification