Trs Technologies, Inc.

Other

The Penn State Research Foundation

Jun Luo

Wesley S Hackenberger

Thomas R Shrout

Shujun Zhang

Kevin A Snook

Fei Li

Raffi Sahul

Yu Teng Liang

Richard J Meyer, Jr

Nevin P Sherlock

A relaxor-PT based piezoelectric crystal is disclosed, comprising the general formula of (PbM){[(M,M)(M,M)]Ti}O, wherein: M is a rare earth cation; Mis selected from the group consisting of Mg, Zn, Yb, Sc, and In; Mis Nb; Mis selected from the group consisting of Mg, Zn, Yb, Sc, In, and Zr; Mis Nbor Zr; 0&#x3c;x&#x2264;0.05; 0.02&#x3c;y&#x3c;0.7; and 0&#x2264;z&#x2264;1, provided that if either Mor Mis Zr, both Mand Mare Zr. A method for forming the relaxor-PT based piezoelectric crystal is disclosed, comprising pre-synthesizing precursor materials by calcining mixed oxides, mixing the precursor materials with single oxides and calcining to form a feeding material, and growing the relaxor-PT based piezoelectric crystal having the general formula of (PbM){[(M,M)(M,M)]Ti}Ofrom the feeding material by a Bridgman method.

Polar nanoregions engineered relaxor-PbTiOferroelectric crystals

The application is directed to piezoelectric single crystals having shear piezoelectric coefficients with enhanced temperature and/or electric field stability. These piezoelectric single crystal may be used, among other things, for vibration sensors as well as low frequency, compact sonar transducers with improved and/or enhanced performance.

Temperature and field stable relaxor-PT piezoelectric single crystals

A transducer is disclosed that includes a multiply resonant composite, the composite having a resonator bar of a piezoelectric single crystal configured in a dtransverse length-extensional resonance mode having a crystallographic orientation set such that the thickness axis is in the &#x3c;110&#x3e; family and resonance direction is the &#x3c;001&#x3e; family.

Transverse mode multi-resonant single crystal transducer

A ternary single crystal relaxor piezoelectric of PMN-PZ-PT grown from a novel melt using the Vertical Bridgeman method. The ternary single crystals are characterized by a Curie temperature, T, of at least 150&#xb0; C. and a rhombohedral to tetragonal phase transition temperature, T, of at least about 110&#xb0; C. The ternary crystals further exhibit a piezoelectric coefficient, d, in the range of at least about 1200-2000 pC/N.

Method of making ternary piezoelectric crystals

A &#x3c;110&#x3e; domain engineered relaxor-PT single crystals having a dielectric loss of about 0.2%, a high electromechanical coupling factor greater than about 85%, and high mechanical quality factor greater than about 500 is disclosed. In one embodiment, the relaxor-PT material has the general formula, Pb(BB)O&#x2014;Pb(B)O, where Bmay be one ion or combination of Mg, Zn, Ni, Sc, In, Yb, Bmay be one ion or combination of Nb, Ta, W, and Bmay be Tior combination of Tiwith Zrand/or Hf.

Relaxor-PT ferroelectric single crystals

A ternary single crystal relaxor piezoelectric grown from a novel melt using the Vertical Bridgeman method. The ternary single crystals are characterized by a Curie temperature, T, of at least 150&#xb0; C. and a rhombohedral to tetragonal phase transition temperature, T, of at least about 110&#xb0; C. The ternary crystals further exhibit a piezoelectric coefficient, d, in the range of at least about 1200-2000 pC/N.

Growing community of inventors

State College, PA, United States of America

Jun Luo