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• W2122757573 abstract "Using conventional and high resolution transmission electron microscopy, the dislocation structures in PbTiO3 thin films grown epitaxially on [001]-oriented MgO and SrTiO3 single crystals are studied. High resolution cross-sectional images of the films grown on MgO exhibit misfit dislocations with Burgers vectors of 1/2 〈010〉 and line directions of 〈100〉. The latter are identified by imaging the interface in two non-parallel zone axes. Plan-view studies of films grown on SrTiO3 reveal dislocations with Burgers vectors of 〈010〉 lying along 〈100〉 directions in the plane of the film. High resolution microscopy of cross-sectional samples shows dislocations in these films that have the additional half-plane on the substrate side of the film, opposite to what is required to accommodate the lattice misfit at room temperature. The mechanisms for dislocation formation and the role of the dislocations in stress relaxation with respect to the competing mechanism of 90° domain formation are discussed. Mit konventioneller und hochauflösender Transmissionselektronenmikroskopie werden Versetzungs-strukturen in PbTiO3-Filmen, die epitaktisch auf [001]-orientierten MgO- und SrTiO3-Einkristallen aufgewachsen wurden, untersucht. Hochauflösungsbilder von Querschnittsproben der Filme auf MgO zeigen Misfit-Versetzungen mit Burgers-Vektoren von 1/2 〈010〉 und Linienrichtungen von 〈100〉. Die letzteren werden durch eine Abbildung der Grenzfläche in zwei nicht parallelen Zonenachsen bestimmt. Untersuchungen von Aufsichtsproben der Filme auf SrTiO3 zeigen Versetzungen mit Burgers-Vektoren von 〈010〉 entlang der 〈100〉 Richtungen der Filmebene. Hochauflösende Mikroskopie an Querschnitts-proben zeigt Versetzungen in diesen Filmen, bei denen sich die eingeschobene Halbebene auf der Substratseite des Films befindet, genau umgekehrt, wie es zum Ausgleich der Gitterfehlpassung bei Raumtemperatur notwendig wäre. Die Mechanismen für die Entstehung der Versetzungen und ihre Rolle beim Abbau von Spannungen unter Berücksichtigung des konkurrierenden Mechanismus, der Bildung von 90° Domänen, werden diskutiert." @default.
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• W2122757573 date "1995-01-16" @default.
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• W2122757573 title "Dislocations in PbTiO3 Thin Films" @default.
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• W2122757573 doi "https://doi.org/10.1002/pssa.2211470115" @default.
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