Investigation of the structure and electrical properties of (KxNa0.96-xLi0.04)(Nb0.96-yTaySb0.04) O3 piezoelectric ceramics modified with manganese

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Verlag/Körperschaft:
Hamburg University of Technology
Erscheinungsjahr:
2012
Medientyp:
Text
Schlagwort:
  • 540: Chemie
Beschreibung:
  • The effect of high doping levels of manganese (Mn) on the structure and electrical properties of (KxNa1-x)NbO3 (KNN) ceramics containing Li, Ta, and Sb has been investigated. The samples were measured using synchrotron X-ray diffraction whereas Rietveld refinement with Fullprof was used to determine the structural information as a function of temperature. Temperature-dependent dielectric measurement was used to compare the phase transition temperatures. The results show that Mn decreases the temperature range of phase coexistence between the orthorhombic and tetragonal phase from ~180°C to ~120°C. The Curie temperature remained unchanged with Mn addition while the dielectric constant and dielectric loss increased with Mn addition. High amounts of Mn led to a reduction in both piezoelectric and ferroelectric properties. The remnant polarization, remnant strain, and piezoelectric coefficient values decreased from 24 μC/cm2, 0.000824, 338 ± 37 pm/V to 13 μC/cm2, 0,00014 and 208 ± 27 pm/V, respectively for the undoped and 5 mol% Mn-doped sample. © 2012 The American Ceramic Society.
Beziehungen:
DOI 10.1111/jace.12019
Quellsystem:
TUHH Open Research
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oai:tore.tuhh.de:11420/10412