Huge impact of compressive strain on phase transition temperatures in epitaxial ferroelectric KxNa1−xNbO3 thin films | Zendy

Leonard von Helden | Zendy; Laura Bogula | Zendy; PierreEymeric Janolin | Zendy; M. Hanke | Zendy; Tobias Breuer | Zendy; M. Schmidbauer | Zendy; Steffen Ganschow | Zendy; Jutta Schwarzkopf | Zendy

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Huge impact of compressive strain on phase transition temperatures in epitaxial ferroelectric KxNa1−xNbO3 thin films

Author(s) -

Leonard von Helden,

Laura Bogula,

PierreEymeric Janolin,

M. Hanke,

Tobias Breuer,

M. Schmidbauer,

Steffen Ganschow,

Jutta Schwarzkopf

Publication year - 2019

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.5094405

Subject(s) - ferroelectricity , materials science , phase transition , monoclinic crystal system , orthorhombic crystal system , piezoresponse force microscopy , phase (matter) , reciprocal lattice , piezoelectricity , curie temperature , condensed matter physics , diffraction , epitaxy , piezoelectric coefficient , hysteresis , optics , crystallography , optoelectronics , nanotechnology , crystal structure , composite material , dielectric , chemistry , layer (electronics) , ferromagnetism , physics , organic chemistry

We present a study in which ferroelectric phase transition temperatures in epitaxial KxNa1−xNbO3 films are altered systematically by choosing different (110)-oriented rare-earth scandate substrates and by variation of the potassium to sodium ratio. Our results prove the capability to continuously shift the ferroelectric-to-ferroelectric transition from the monoclinic MC to orthorhombic c-phase by about 400 °C via the application of anisotropic compressive strain. The phase transition was investigated in detail by monitoring the temperature dependence of ferroelectric domain patterns using piezoresponse force microscopy and upon analyzing structural changes by means of high resolution X-ray diffraction including X-ray reciprocal space mapping. Moreover, the temperature evolution of the effective piezoelectric coefficient d33,f was determined using double beam laser interferometry, which exhibits a significant dependence on the particular ferroelectric phase.

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