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Title: Mechanisms of Enhanced Thermal Stability of Polarization in Lead-Free (Bi1/2Na1/2)0.94Ba0.06TiO3/ZnO Ceramic Composites

Journal Article · · Physical Review Materials
 [1];  [2];  [2];  [3];  [3];  [1]
  1. Iowa State Univ., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
  3. Nanjing Univ., Nanjing (China)
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(Bi1/2Na1/2)TiO3-based solid solutions, one of the major systems of lead-free piezoelectric ceramics, exhibit a low thermal depolarization temperature (Td~100°C). It was reported that by incorporating 30 mol% ZnO particles to form a ceramic composite of (Bi1/2Na1/2)0.94Ba0.06TiO3/ZnO, the depolarization process can be shifted up to ~250 °C. In the present work, a variety of advanced transmission electron microscopy techniques, including in situ heating, annular bright-field, high-angle annular dark-field, geometric phase analysis, energy-dispersive spectrum and electron energy-loss spectroscopy, are employed to investigate the underlying mechanisms for the enhanced thermal stability of polarization in the composite. Furthermore, it is found that the abrupt depolarization in (Bi1/2Na1/2)0.94Ba0.06TiO3 at Td becomes diffused over a wide temperature window up to the temperature at maximum dielectric constant (Tm) under the combined actions of the incorporation of Zn into the perovskite lattice, the presence of residual stresses, and the pinning effect on micron-sized domains provided by ZnO particles.

Research Organization:
Ames Lab., Ames, IA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
DMR-1465254; AC02-07CH11358; 11674156
OSTI ID:
1494936
Alternate ID(s):
OSTI ID: 1493644
Report Number(s):
IS-J-9879; PRMHAR
Journal Information:
Physical Review Materials, Vol. 3, Issue 2; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (4)

Dual-stimuli in-situ TEM study on the nonergodic/ergodic crossover in the 0.75(Bi 1/2 Na 1/2 )TiO 3 –0.25SrTiO 3 relaxor journal May 2019
Spontaneous ferroelectric order in lead-free relaxor N a 1 / 2 B i 1 / 2 Ti O 3 -based composites journal May 2020
Electric field‐induced irreversible relaxor to ferroelectric phase transformations in Na 0.5 Bi 0.5 TiO 3 ‐NaNbO 3 ceramics journal June 2019
Spontaneous ferroelectric order in lead-free relaxor, $Na_{1/2}Bi_{1/2}TiO_{3}$ -based composites text January 2020

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