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Mapping the structural transitions controlled by the trilinear coupling in Ca3-xSrxTi2O7

DOI: 10.1063/1.5089723 DOI Help

Authors: Marie Kratochvilova (Institute for Basic Science, South Korea; Seoul National University; Charles University) , Fei-Ting Huang (Rutgers University) , Maria-Teresa Fernandez Diaz (Institut Laue Langevin) , Milan Klicpera (Charles University) , Sarah Day (Diamond Light Source) , Stephen P. Thompson (Diamond Light Source) , Yoon-Seok Oh (Ulsan National Institute of Science and Technology (UNIST)) , Bin Gao (Rutgers University) , Sang-Wook Cheong (Rutgers University) , Je-Geun Park (Institute for Basic Science; Seoul National University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Applied Physics , VOL 125

State: Published (Approved)
Published: June 2019
Diamond Proposal Number(s): 16074

Abstract: We present the results of the high-temperature neutron and x-ray diffraction experiments on the Ca3–xSrxTi2O7 (x = 0.5, 0.8, 0.85, 0.9) compounds. The ferro- to paraelectric transition in these hybrid improper ferroelectric materials arises from the so-called trilinear coupling. Depending on the strontium content, various structures and phase transitions, different from theoretical predictions, emerge. The in situ x-ray powder diffraction indicates a direct ferro- to paraelectric transition between the orthorhombic A21am and the tetragonal undistorted I4/mmm phase for x ≤ 0.6. We identified a reduction in the trilinear coupling robustness by increasing the Sr-doping level to lead to the emergence of the intermediate tetragonal P42/mnm phase and the gradual suppression of the orthorhombic phase. The observed character of the structure transitions and the Ca3–xSrxTi2O7 phase diagram are discussed in the framework of theoretical models of other related hybrid improper ferroelectric systems.

Journal Keywords: Neutron scattering; Phase transitions; Differential scanning calorimetry; Ferroelectric materials; X-ray diffraction

Diamond Keywords: Ferroelectricity; Ferromagnetism

Subject Areas: Physics, Materials


Instruments: I11-High Resolution Powder Diffraction

Added On: 25/07/2019 14:03

Discipline Tags:

Quantum Materials Multiferroics Physics Hard condensed matter - structures Materials Science

Technical Tags:

Diffraction X-ray Powder Diffraction