Journal
INORGANIC CHEMISTRY
Volume 52, Issue 9, Pages 5045-5054Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic302769h
Keywords
-
Categories
Funding
- National Natural Science Foundation [51172187]
- SRPDF [20116102130002]
- 111 Program of MOE [B08040]
- Xi'an Science and Technology Foundation of China [CX1261-2, CX1261-3]
Ask authors/readers for more resources
New high temperature Aurivillius piezoelectrics Na0.5NdxBi2.5-xNb2O9 (NDBNx, x = 0.1, 0.2, 0.3, and 0.5) with Nd substitution for Bi at the A site were synthesized using a solid state reaction process. Crystal structures of NDBN0.2 and NDBN0.5 were refined with the Rietveld method with powder X-ray diffraction, and they crystallized in the orthorhombic space group A2(1)am [a = 5.48558(8) angstrom, b = 5.46326(9) angstrom, c = 24.8940(4) angstrom, and Z = 4 for NDBN0.2 and a = 5.46872(5) angstrom, b = 5.46730(5) angstrom, c = 24.80723(25) angstrom, and Z = 4 for NDBN0.5], at room temperature. The refinement results and Raman spectroscopy of NDBNx verified that Nd occupied both the A site in the perovskite layers and the cation site in the (Bi2O2)(2+) layers. The Nd substitution induced an enhancement in cation disordering between the A site and the (Bi2O2)(2+) layer and an increase in the degree of the relaxation behavior for NDBNx. The ferroelectric to paraelectric phase transition temperature (T-c) of NDBNx ranged from 735 to 764 degrees C. Furthermore, the isovalent substitution of Nd for Bi had a great influence on microstructure (grain size and shape), defect concentration (mainly oxygen vacancies), preferred grain orientation (texture), and distortion of the octahedron. The coaction between these effects determined the structure characteristics, phase transition behaviors, and electrical properties of NDBNx.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available