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Microstructure and dielectric relaxor properties for Ba 0 . 5 Sr 0 . 5 TiO 3 / La 0 . 67 Sr 0 . 33 MnO 3 heterostructure
| Content Provider | Semantic Scholar |
|---|---|
| Author | Miao, Jun Gang Tian, Hai Yan Zhou, Xiang Pang, Kuah Hsian Wang, Yongqiang |
| Copyright Year | 2007 |
| Abstract | Ferroelectric and magnetoresistance heterostructure Ba,Sr TiO3/ La,Sr MnO3 BST/LSMO heterostructure is deposited epitaxially on SrTiO3 001 substrate by pulse laser deposition. The phase structures of the BST/LSMO heterostructure are characterized by x-ray diffraction. Cross-sectional transmission electron microscope shows a substantial interdiffusision between BST and LSMO layers. The dielectric properties and conductivity of BST/LSMO heterostructure is measured as a function of temperature, frequency, and electric field. The dielectric constant dependence on electric field, vs E, exhibits a strong nonlinear behavior in the temperature from 20 to 300 K, while E=0 vs T relation shows a dielectric relaxor characteristic. Furthermore, the dielectric constant E=0 kV/cm and the dielectric tunability E=200 kV/cm are found to be similar temperature dependencies. Last, in the temperature regime where a semiconduction-type conduction became dominate, the activation thermal energy of BST/LSMO heterostructure is estimated to be 0.67 and 0.73 eV at 1 kHz and 1 MHz, respectively. © 2007 American Institute of Physics. DOI: 10.1063/1.2721393 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://ira.lib.polyu.edu.hk/bitstream/10397/4183/1/Miao_Microstructure_dielectric_relaxor.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
