Journal Article

PUBDB-2019-00716

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Robust Macroscopic Polarization of Block Copolymer-Templated Mesoporous Perovskite-Type Thin-Film Ferroelectrics

Androš Dubraja, L. ; Kruk, R.Extern* ; Brezesinski, T. (Corresponding author)Extern*

2019
Wiley Chichester

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Please use a persistent id in citations: doi:10.1002/aelm.201800287  doi:10.3204/PUBDB-2019-00716

Abstract: Ferroelectrics play an important role in various applications, from electronics to mechanics, optics, and biomedicine. Here, the preparation of a series of block copolymer–templated mesostructured (lead‐free) oxide ferroelectrics is described. Distorted perovskite LiNbO$_3$, LiTaO$_3$, and solid solution LiNbO$_3$–LiTaO$_3$ are produced as single‐phase thin films of good quality by the dip‐coating method using an evaporation‐induced self‐assembly process. They are investigated by a combination of electron microscopy, X‐ray diffraction and scattering, X‐ray photoelectron spectroscopy, and time‐of‐flight secondary ion mass spectrometry. Thermal treatment at ≥600 °C is required to initiate crystallization. Both the pore ordering and thermal stability increase with increasing tantalum content. Ferroelectric testing through dynamic and remanent polarization experiments at ambient conditions confirm the uniformity and purity of the LiNbO$_3$ thin‐film system. Results from positive‐up and negative‐down test measurements reveal a stable switching polarization of 2 µC cm$^{−2}$, with a coercive field of 50 kV cm$^{−1}$. Taken together, the lithium niobium and tantalum oxides prepared in the work are rare examples of sol–gel derived perovskite‐type materials with an ordered mesoporous morphology. Because of the spontaneous electrical polarization observed for LiNbO$_3$, such block copolymer–templated thin films might pave the way for the development of a new class of 3D nanocomposite ferroics.

Note: © WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Experiment(s):

1. DORIS Beamline BW4 (DORIS III)

Appears in the scientific report 2019

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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