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Study on magnetoelectric properties of Ni0.5Zn0.5Fe2O4/Ba0.8Sr0.2TiO3 composite ceramics based on Bi2O3 as combustion aid.
- Source :
- Journal of Materials Science: Materials in Electronics; Mar2020, Vol. 31 Issue 5, p4073-4082, 10p
- Publication Year :
- 2020
-
Abstract
- Ni<subscript>0.5</subscript>Zn<subscript>0.5</subscript>Fe<subscript>2</subscript>O<subscript>4</subscript>/Ba<subscript>0.8</subscript>Sr<subscript>0.2</subscript>TiO<subscript>3</subscript> (NZFO/BST) composite ceramics with different additions of Bi<subscript>2</subscript>O<subscript>3</subscript> (0%, 1%, 3%, and 5% wt) were synthesized via the solid-phase sintering method. XRD analysis indicates that the composite ceramics show bi-phase structure, without apparent secondly phases can be observed. SEM images show that all the specimens have relative dense structure, the grain size is in the range 1–2 μm. A certain amount of Bi<subscript>2</subscript>O<subscript>3</subscript> is beneficial to grain growth, the average grain size of NZFO/BST ceramics increases from 179 to 297 nm when the concentration of Bi<subscript>2</subscript>O<subscript>3</subscript> is 0 and 3%, respectively. EDS results indicate that the distribution of NZFO phase and BST phase is not uniform. The sample NZFO/BST-3%Bi<subscript>2</subscript>O<subscript>3</subscript> not only has the largest dielectric constant (ε<subscript>r</subscript>) in the whole temperature range (25–500 °C), but also presents the smallest dielectric loss (tanδ) at high temperature region (> 400 °C), and the maximum tanδ value is less than 0.4 for all the samples, indicating excellent dielectric performance. Compared with other samples, the specimen NZFO/BST-3%Bi<subscript>2</subscript>O<subscript>3</subscript> has the largest remnant polarization (~ 1.14 μC/cm<superscript>2</superscript>). The sample NZFO/BST-3%Bi<subscript>2</subscript>O<subscript>3</subscript> has the largest leakage current density, while the ceramic NZFO/BST-5%Bi<subscript>2</subscript>O<subscript>3</subscript> presents the opposite behavior, the value of leakage current of the sample NZFO/BST-3%Bi<subscript>2</subscript>O<subscript>3</subscript> is about 7 times larger than that of the specimen NZFO/BST-5%Bi<subscript>2</subscript>O. All the composite ceramics show soft magnetic behavior, since Bi<subscript>2</subscript>O<subscript>3</subscript> is a non-magnetic phase, addition of Bi<subscript>2</subscript>O<subscript>3</subscript> will dilute the magnetic moment per unit volume so as to decrease the magnetic properties of the ceramics. The sample NZFO/BST-3%Bi<subscript>2</subscript>O<subscript>3</subscript> has the second largest saturation magnetization (M<subscript>r</subscript>) of 11.27 emu/g and the smallest coercive field (H<subscript>C</subscript>) ~ 3.54 Oe. All the samples show strong magnetoelectric coupling effect, the highest magnetoelectric coupling coefficient is ~ 47 Vcm<superscript>−1</superscript>Oe<superscript>−1</superscript>, which was obtained in the sample without addition of Bi<subscript>2</subscript>O<subscript>3</subscript>. In short, the addition of Bi<subscript>2</subscript>O<subscript>3</subscript> not only affects the structure of composite ceramics, but also plays an important role in affecting the magnetoelectric performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09574522
- Volume :
- 31
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science: Materials in Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 141807747
- Full Text :
- https://doi.org/10.1007/s10854-020-02954-2