Piezoelectric material composition and preparation method thereof

A piezoelectric material composition comprising a plurality of grains,

• wherein:
• each of the plurality of grains is distinguished from each other by a grain boundary;
• and
• each of the plurality of grains includes a first material doped with 2 mol % to 3 mol % of Mn based on 100 mol % of the total composition, and represented by Formula 1 below:
• wherein the x is 0.21 to 0.25.

A method for preparing a piezoelectric material composition, the method comprising:

• mixing MgNb2O6 and PbO, TiO2, and MnO2 to form a first material doped with Mn and represented by Formula 1 below;
• mixing the first material and a second material in a solvent to prepare a slurry;
• tape-casting the slurry to form a piezoelectric sheet;
• laminating the piezoelectric sheet;
• and
• sintering the piezoelectric sheet in an oxygen atmosphere,
• wherein:
• 2 mol % to 3 mol % of the Mn is doped based on 100 mol % of the first material;
• the second material is a seed having a perovskite structure;
• and
• the content of the second material is 0.5 vol % to 1.5 vol % based on 100 vol % of the slurry:
• wherein the x is 0.21 to 0.25.