Documents disponibles écrits par cet auteur

Electric-field-induced phase-change behavior in (Bi0.5Na0.5)TiO3–BaTiO3–(K0.5Na0.5)NbO3 / John E. Daniels in Acta materialia, Vol. 58 N° 6 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2103–2111 Titre : Electric-field-induced phase-change behavior in (Bi0.5Na0.5)TiO3–BaTiO3–(K0.5Na0.5)NbO3 : A combinatorial investigation Type de document : texte imprimé Auteurs : John E. Daniels, Auteur ; Wook Jo, Auteur ; Jürgen Rödel, Auteur Année de publication : 2011 Article en page(s) : pp. 2103–2111 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Electroceramics  Piezoelectricity  Phase  transformation  X-ray  diffraction  (XRD)  X-ray  fluorescence Résumé : The electric-field-induced strain behavior in (1 − x − y)(Bi0.5Na0.5)TiO3–xBaTiO3–y(K0.5Na0.5)NbO3 electroceramics has been studied using a combinatorial technique. A stoichiometrically graded sample was produced to contain compositions across the ternary phase diagram between the two end-member components of 0.93(Bi0.5Na0.5)TiO3–0.07BaTiO3 and 0.86(Bi0.5Na0.5)TiO3–0.14(K0.5Na0.5)NbO3. Both composition and structural information were measured simultaneously during the application of electric fields using secondary X-ray fluorescence and high-energy X-ray microdiffraction, respectively. An initial electric-field-induced distortion from the pseudo-cubic structure is seen across all compositions, while those with a greater concentration of BaTiO3 also undergo an electric-field-induced phase transformation. The microstructural contribution to the macroscopic strain within the 0.93(Bi0.5Na0.5)TiO3–0.07BaTiO3 end member is quantified at a field strength of 5.5 kV mm−1; 0.08% and 0.11% of the measured macroscopic strain of 0.4% is contributed by the induced ferroelastic domain texture and the volumetric strain associated with the electric-field-induced phase transformation, respectively. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008313 [article] Electric-field-induced phase-change behavior in (Bi0.5Na0.5)TiO3–BaTiO3–(K0.5Na0.5)NbO3 : A combinatorial investigation [texte imprimé] / John E. Daniels, Auteur ; Wook Jo, Auteur ; Jürgen Rödel, Auteur . - 2011 . - pp. 2103–2111. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2103–2111 Mots-clés : Electroceramics  Piezoelectricity  Phase  transformation  X-ray  diffraction  (XRD)  X-ray  fluorescence Résumé : The electric-field-induced strain behavior in (1 − x − y)(Bi0.5Na0.5)TiO3–xBaTiO3–y(K0.5Na0.5)NbO3 electroceramics has been studied using a combinatorial technique. A stoichiometrically graded sample was produced to contain compositions across the ternary phase diagram between the two end-member components of 0.93(Bi0.5Na0.5)TiO3–0.07BaTiO3 and 0.86(Bi0.5Na0.5)TiO3–0.14(K0.5Na0.5)NbO3. Both composition and structural information were measured simultaneously during the application of electric fields using secondary X-ray fluorescence and high-energy X-ray microdiffraction, respectively. An initial electric-field-induced distortion from the pseudo-cubic structure is seen across all compositions, while those with a greater concentration of BaTiO3 also undergo an electric-field-induced phase transformation. The microstructural contribution to the macroscopic strain within the 0.93(Bi0.5Na0.5)TiO3–0.07BaTiO3 end member is quantified at a field strength of 5.5 kV mm−1; 0.08% and 0.11% of the measured macroscopic strain of 0.4% is contributed by the induced ferroelastic domain texture and the volumetric strain associated with the electric-field-induced phase transformation, respectively. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008313