High frequency piezoelectric crystal composites, devices, and methods for manufacturing the same

A piezoelectric PMN-PT based crystal composite, said piezoelectric crystal composite having a crystal composition with one lead-free component, and being represented by the formula:

• x*ABO3-y*PbTiO3-(1-x-y)*Pb(Mg1/3Nb2/3)O3;
• wherein,
• x is defined as molar % 0.00 to 0.50;
• y is defined as molar % 0.00 to 0.50;
• A represents Bismuth (Bi) or Barium (Ba);
• B represents one selected from the group consisting of:
• Indium (In), Ytterbium (Yb), Iron (Fe), Zirconium (Zr), Scandium (Sc), Niobium (Nb), Tantalum (Ta), and a combination of these elements,
• wherein when said crystal composite is (011) cut and <011> poled and provides zero strain in the direction of +/−32.5° (+/−2.5°) away from the <011> direction according to the coordinate rotation d31 formula:
• d′31=d31*Cos(θ)*Cos(θ)+d32*Sin(θ)*Sin(θ).