TU Darmstadt / ULB / TUbiblio

Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics

Dittmer, Robert ; Jo, Wook ; Webber, Kyle G. ; Jones, Jacob L. ; Rödel, Jürgen :
Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics.
[Online-Edition: http://dx.doi.org/10.1063/1.4866092]
In: Journal of Applied Physics, 115 (8) 084108(1-7). ISSN 0021-8979
[Artikel], (2014)
Note:

SFB 595 A1

Offizielle URL: http://dx.doi.org/10.1063/1.4866092

Kurzbeschreibung (Abstract)

The temperature-dependent Young's modulus Y(T) of the lead-free piezoceramics of 0.8Bi1/2 Na 1/2TiO3-0.2Bi1/2K1/2TiO3 (20BKT) and 0.96(0.8Bi1/2 Na 1/2TiO3-0.2Bi1/2K1/2TiO3)-0.04BiZn1/2Ti1/2O3 (4BZT) is measured with the impulse excitation technique and contrasted with corresponding dielectric and structural data. While the dielectric properties suggest a phase transition, the high resolution XRD patterns remain virtually unchanged from room temperature up to high temperatures, confirming no change in their long-range order. In contrast, the elastic properties indicate a broad and diffuse ferroelastic transition denoted by a minimum in Y(T). By analogy to the elastic and dielectric data of PbZrxTi1−xO3 and PLZT, it is concluded that 20BKT and 4BZT are relaxors with polar nanoregions embedded in a metrically cubic matrix. Interestingly, no indication for the freezing temperature was reflected in any of the employed measurement techniques. From the saturation of Y(T), it is suggested that the Burns temperature may be approximated as 700 °C. Moreover, it is found that the modification with the ternary end-member BiZn1/2Ti1/2O3 results in an increase in Young's modulus. A comparison with the Bi1/2 Na 1/2TiO3-BaTiO3-K0.5 Na 0.5NbO3 yields the same results.

Typ des Eintrags: Artikel
Erschienen: 2014
Autor(en): Dittmer, Robert ; Jo, Wook ; Webber, Kyle G. ; Jones, Jacob L. ; Rödel, Jürgen
Titel: Local structure change evidenced by temperature-dependent elastic measurements: Case study on Bi1/2Na1/2TiO3-based lead-free relaxor piezoceramics
Sprache: Englisch
Kurzbeschreibung (Abstract):

The temperature-dependent Young's modulus Y(T) of the lead-free piezoceramics of 0.8Bi1/2 Na 1/2TiO3-0.2Bi1/2K1/2TiO3 (20BKT) and 0.96(0.8Bi1/2 Na 1/2TiO3-0.2Bi1/2K1/2TiO3)-0.04BiZn1/2Ti1/2O3 (4BZT) is measured with the impulse excitation technique and contrasted with corresponding dielectric and structural data. While the dielectric properties suggest a phase transition, the high resolution XRD patterns remain virtually unchanged from room temperature up to high temperatures, confirming no change in their long-range order. In contrast, the elastic properties indicate a broad and diffuse ferroelastic transition denoted by a minimum in Y(T). By analogy to the elastic and dielectric data of PbZrxTi1−xO3 and PLZT, it is concluded that 20BKT and 4BZT are relaxors with polar nanoregions embedded in a metrically cubic matrix. Interestingly, no indication for the freezing temperature was reflected in any of the employed measurement techniques. From the saturation of Y(T), it is suggested that the Burns temperature may be approximated as 700 °C. Moreover, it is found that the modification with the ternary end-member BiZn1/2Ti1/2O3 results in an increase in Young's modulus. A comparison with the Bi1/2 Na 1/2TiO3-BaTiO3-K0.5 Na 0.5NbO3 yields the same results.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Applied Physics
Band: 115
(Heft-)Nummer: 8
Freie Schlagworte: Elastic moduli; Relaxor ferroelectrics; Permittivity; Elasticity; Temperature measurement; X-ray diffraction; Phase transitions; Sodium Lead zirconate titanate; Dielectrics
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Elektromechanik von Oxiden
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Nichtmetallisch-Anorganische Werkstoffe
Zentrale Einrichtungen > Sonderforschungsbereich 595 > A - Synthese > A1
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Zentrale Einrichtungen > Sonderforschungsbereich 595 > A - Synthese
Zentrale Einrichtungen > Sonderforschungsbereich 595
Fachbereich Material- und Geowissenschaften
Zentrale Einrichtungen
Hinterlegungsdatum: 27 Feb 2014 10:06
Offizielle URL: http://dx.doi.org/10.1063/1.4866092
Zusätzliche Informationen:

SFB 595 A1

ID-Nummer: 10.1063/1.4866092
Export:

Optionen (nur für Redakteure)

Eintrag anzeigen Eintrag anzeigen