DataVXACS Applied Materials & InterfacesPaper
journal article·2025-07-30

Identifying the Limits of Strain Engineering in NaNbO3 Ultrathin Films

Shengwei Zeng, Khuong Phuong Ong, Samantha Faye Duran Solco, Zhi Shiuh Lim, Qibin Zeng, Baichen Lin, Jiangbo Luo, Wenting Zhao, Tiancheng Luo, Weifan Cai, Zhen Ye, Celine Sim, Chee Kiang Ivan Tan, Seeram Ramakrishna, Yeng Ming Lam, Ariando Ariando, Huajun Liu

ACS Applied Materials & Interfaces· Volume 17· Issue 30
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Source abstract

Abstract

Epitaxial NaNbO 3 ultrathin films are grown on single-crystal substrates with a wide range of compressive (−6.24%) and tensile (+7.13%) strain. High-resolution X-ray diffraction reveals a coherently strained state of NaNbO 3 thin films within the strain range from −1.42 to 1.86%, beyond which the films are in relaxed states. This is accompanied by a change in the growth mode from step-flow growth in strained films to coalesced island growth in relaxed films. Piezoresponse force microscopy measurements, including domain writing and reading, reveal a single vertical ferroelectric domain for the compressive films, while the tensile films exhibit a mixture of multiple vertical domains. The first-principles calculations confirm the stability of strained NaNbO 3 . Our results provide important information for the understanding and engineering of strained functional thin films.
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Research context

Electronic materials

OpenAlex topics: Ferroelectric and Piezoelectric Materials · Electronic and Structural Properties of Oxides · Multiferroics and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore

Institute of High Performance Computing (IHPC)

Agency for Science, Technology and Research (A*STAR)

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore

Department of Physics, Faculty of Science

National University of Singapore

Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Republic of Singapore

Facility for Analysis, Characterisation, Testing and Simulation (FACTS)

Nanyang Technological University

Funding

Agency for Science, Technology and Research · Ministry of Education - Singapore · National Research Foundation Singapore · Career Development Fund · SUSTech-NUS Joint Research Program

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