Abstract
Ausgelenkt: Eine neuer Blei-freier Bismutperowskit wurde bei Umgebungsdruck in der polaren Pmc21-Struktur gebildet. Messungen liefern Beweise für Ferroelektrizität und Piezoelektrizität. Das Material zeichnet sich durch eine Rotation der Polarisationsrichtung abseits der [111]p-Achse aus und ist somit für das Design von Materialien mit morphotroper Phasengrenze interessant.
Highlights
Piezoelectrics are key functional materials in actuator and sensor applications.[1]
Bi2Mn4/3Ni2/3O6 is antiferrodisplacive,[5] while both BiFeO3 and BFTM adopt the R’ R3c structure where the [111]p displacements of untilted R are coupled with octahedral rotation about the same axis
We investigated the pseudoternary phase field BFTM– LaFeO3 (LFO)–La2MgTiO6 (LMT) where the introduction of LFO would alter the average structural asymmetry on the A site by combining the aspherical Bi3+ and spherical La3+ cations, and the addition of Mg2+ and Ti4+ from LMT (t = 0.95) on the B site would reduce the dielectric loss caused by the increase in Fe3+ content
Summary
Piezoelectrics are key functional materials in actuator and sensor applications.[1]. Current technology exploits lead-based materials displaying a morphotropic phase boundary (MPB) between two ferroelectric solid solutions of different symmetries and polarization directions. LFO adopts the Pmnb structure of GdFeO3 with an a+bÀbÀ tilt system and 0.18 antiferrodistortive La3+ displacements along the [110]p direction.
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