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Structure and properties of (Cu Ca Bi) doped KNN leadfree piezoceramics

C. MICLEA1,* , C. TANASOIU1, C. F. MICLEA1, L. TRUPINA1, M. CIOANGHER1, C. T. MICLEA2, V. MALCZANEK3, M. SUSU2, I. VOICU2, A. IVANOV1

Affiliation

  1. National Institute for Materials Physics, Bucharest-Magurele, ROMANIA
  2. Hyperion University, Calea Calarasilor 169, sector 3, Bucharest, ROMANIA
  3. Fairleigh Dickinson University, NJ, USA

Abstract

Lead free ceramics in the system (1-x)KNN·x(Bi2O3,CaO,CuO) with 0.0≤x≤0.1 were synthesized by the usual solid state reaction and their structural and piezoelectric properties were investigated. Dense samples with densities of about 4.68 g/cm3 were prepared by sintering at an optimum temperature of 1150 oC for 6 h. Only perovskite phase was detected by Xray investigation in all samples. A typical MPB where orthorombic-tetragonal phases coexist was detected for a doping level of 0.06 where the piezoelectric parameters showed maximum values. Planar coupling factor, as much as 0.46, piezoelectric charge constant of 270 pC/N and mechanical quality factor Qm of 75 were recorded for the samples situated within the MPB..

Keywords

Doped niobates, Lead free piezoceramics, Structure, Piezoelectric properties.

Citation

C. MICLEA, C. TANASOIU, C. F. MICLEA, L. TRUPINA, M. CIOANGHER, C. T. MICLEA, V. MALCZANEK, M. SUSU, I. VOICU, A. IVANOV, Structure and properties of (Cu Ca Bi) doped KNN leadfree piezoceramics, Optoelectronics and Advanced Materials - Rapid Communications, 3, 9, September 2009, pp.942-946 (2009).

Submitted at: Aug. 10, 2009

Accepted at: Sept. 15, 2009