Effect of dopants(A=Mg2þ, Ca2þ and Sr2þ) on ferroelectric, dielectric and piezoelectricpropertiesof(Ba1_xAx) (Ti0.98Zr0.02) O3 lead-free piezo ceramics

Chandraiah, M and Panda, PK (2015) Effect of dopants(A=Mg2þ, Ca2þ and Sr2þ) on ferroelectric, dielectric and piezoelectricpropertiesof(Ba1_xAx) (Ti0.98Zr0.02) O3 lead-free piezo ceramics. Ceramics International, 41 . pp. 8040-8045. ISSN 0272-8842

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    Abstract

    The effectofMg2þ, Ca2 þ and Sr2þ dopants on ferroelectric, dielectric and piezoelectric properties of BZT(Ba1�xAx) (Ti0.98Zr0.02) O3 (x¼0.00, 0.01,0.015,0.02and0.03)(A¼Mg2þ, Ca2þ and Sr2þ) was studied.The precursor powders prepared by a “mixed oxide” route and calcined at1000 1C for 4h. The calcined powders were de-agglomerated, pressed into pellets and sintered at 1150 1C for 3h. Scanning electron microscopy (SEM) studies of polished sintered pellets reveals the grains mostly of sub-micronsized for pure BZT samples,large(2–5 μm) for doped BZTs. EDS analysis of the samples confirms the presence of dopants very close to their stoichiometric compositions. The piezoelectric charge constant was maximum for 0.015molSr2þ doped BZT(d33¼330pC/N). Similarly, the dielectric constant was maximum for 0.015mol Ca2þdoped BZT(K¼2521) and the remnant polarization was maximum for 0.015molSr2þ doped BZT(Pr¼4.69 μC/cm2). & 2015 ElsevierLtdandTechnaGroupS.r.l.

    Item Type: Journal Article
    Additional Information: Copyright to this article belongs to M/s. ELSEVIER
    Uncontrolled Keywords: Ferroelectrics;Dielectrics;Piezoelectriccoefficient; Barium Zirconium Titanate;Rietveld analysis
    Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Materials Science Division, Materials Science Division
    Depositing User: Ms. Alphones Mary
    Date Deposited: 01 May 2015 12:43
    Last Modified: 01 May 2015 12:43
    URI: http://nal-ir.nal.res.in/id/eprint/12095

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