Structure and thermal expansion of the tungsten bronze Pb2KNb5O15
Article
Article Title | Structure and thermal expansion of the tungsten bronze Pb2KNb5O15 |
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ERA Journal ID | 1539 |
Article Category | Article |
Authors | Lin, Kun (Author), Wu, Hui (Author), Wang, Fangfang (Author), Rong, Yangchun (Author), Chen, Jun (Author), Deng, Jinxia (Author), Yu, Ranbo (Author), Fang, Liang (Author), Huang, Qingzhen (Author) and Xing, Xianran (Author) |
Journal Title | Dalton Transactions: an international journal of inorganic chemistry |
Journal Citation | 43 (19), pp. 7037-7043 |
Number of Pages | 7 |
Year | 2014 |
Place of Publication | United Kingdom |
ISSN | 1477-9226 |
1477-9234 | |
Digital Object Identifier (DOI) | https://doi.org/10.1039/c3dt53340a |
Web Address (URL) | http://pubs.rsc.org/en/content/articlelanding/2014/dt/c3dt53340a#!divAbstract |
Abstract | The structure and thermal expansion behavior of the tetragonal tungsten bronze oxide Pb2KNb5O15 were investigated by neutron powder diffraction and high-temperature X-ray diffraction. Below the Curie temperature, TC (orthorhombic phase, TC ≈ 460°C), the cell parameters a and c increase with temperature, while b decreases. The thermal expansion coefficients are αa = 1.29 × 10-5°C-1, αb = -1.56 × 10-5°C-1, and αc = 1.62 × 10-5°C-1. Temperature-dependent second harmonic generation (SHG), dielectric, and polarization-electrical field (P-E) hysteresis loop measurements were performed to study the symmetry and electric properties. We show that the distortion and cooperative rotation of NbO6 octahedrons are directly responsible for the negative thermal expansion coefficient along the polar b axis. It is suggested that Pb-O covalency, especially in the large and asymmetric pentagonal prisms, may be related to orthorhombic distortion and abnormal spontaneous polarization along the b axis. This study shows that tungsten bronze families are possible candidates for exploring negative thermal expansion materials. |
Keywords | high temperature X-ray diffraction; hysteresis loop measurements; negative thermal expansion coefficients; negative thermal expansion material; spontaneous polarizations; tetragonal tungsten bronze; thermal expansion behavior; thermal expansion coefficients; strength of building materials; mechanical properties; lead and alloys; tin and alloys; fluid flow; electricity, basic concepts and phenomena; light and optics; nonlinear optics; atomic and molecular physics; Materials Science; |
ANZSRC Field of Research 2020 | 340399. Macromolecular and materials chemistry not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Science and Technology of China, Hefei, China |
National Institute of Standards and Technology, United States | |
University of Science and Technology Beijing, China | |
Guilin University of Technology, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q426w/structure-and-thermal-expansion-of-the-tungsten-bronze-pb2knb5o15
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