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Related Experiment Video

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Strain Engineered CaBi2Nb2O9 Thin Films with Enhanced Electrical Properties.

Yunxiang Zhang1,2, Jun Ouyang1,2,3, Jincan Zhang1,2

  • 1Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering and School of Physics, State Key Laboratory of Crystal Materials, Shandong University , Jinan, Shandong 250061, China.

ACS Applied Materials & Interfaces
|June 14, 2016
PubMed
Summary

Strain engineered thin films of bismuth layer-structured ferroelectric CaBi2Nb2O9 exhibit excellent electrical properties. This study details the preparation and characterization of these advanced ferroelectric materials.

Keywords:
bismuth layer-structured ferroelectrics (BLSFs)calcium bismuth niobate (CaBi2Nb2O9)electrical propertymagnetron sputteringstrain engineering

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Ferroelectricity

Background:

  • Bismuth layer-structured ferroelectrics (BLSF) are a class of materials with unique electrical and piezoelectric properties.
  • CaBi2Nb2O9 (CBNO) is a promising BLSF material for various electronic applications.
  • Controlling film properties through strain engineering is crucial for optimizing device performance.

Purpose of the Study:

  • To prepare strain-engineered polycrystalline thin films of CaBi2Nb2O9 (CBNO) using radio frequency (RF) magnetron sputtering.
  • To investigate the structural, compositional, and electrical properties of the fabricated CBNO films.
  • To understand the relationship between strain, microstructure, and electrical performance in BLSF thin films.

Main Methods:

  • Radio frequency (RF) magnetron sputtering for thin film deposition.
  • X-ray Diffraction (XRD) for structural and texture analysis.
  • Transmission Electron Microscopy (TEM) for microstructural and crystallographic investigation.
  • Quantitative X-ray Photoelectron Spectroscopy (XPS) for compositional analysis.

Main Results:

  • Successfully prepared ~250 nm thick CBNO films with (200)/(020) and (00l) texture and significant in-plane tensile stress.
  • TEM confirmed the characteristic bismuth layered-structure and a strain-controlled grain growth.
  • XPS analysis indicated the film composition closely matched the chemical stoichiometry.
  • Achieved excellent electrical properties: high dielectric constant (~280 @5 kHz), low dielectric loss (tgδ ≤ 1.6% up to ~1200 kV/cm), and large polarization (Pr ≈ 14 μC/cm(2) @ 1 kHz).

Conclusions:

  • Strain engineering is an effective method for controlling the microstructure and enhancing the electrical properties of CBNO thin films.
  • The prepared CBNO films demonstrate potential for high-performance ferroelectric device applications.
  • The combination of sputtering technique and strain control offers a viable route for fabricating advanced BLSF materials.