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Featured researches published by Haiyang Dai.


Advances in Applied Ceramics | 2018

Effect of calcining temperature on the microstructure and magnetic properties of CuFeO2 multiferroic ceramic

Xinyu Xie; Haiyang Dai; Tao Li; Gaoshang Gong; Zhenping Chen

ABSTRACT Multiferroic ceramic CuFeO2 has been successfully fabricated by traditional solid-state reaction method under different calcining temperatures. X-ray powder diffraction results show that a higher calcining temperature is beneficial to form single delafossite phase with a hexahedron crystal structure. Raman and scanning electron microscopy results indicate that the proper calcining temperature is favourable to enhance the polarisation strength, grain size and density of samples. Magnetic properties results reveal that all samples exhibit two successive magnetic transitions with decreasing temperature, the corresponding magnetic transition temperature TN1 and TN2 are independent on calcining temperature. It is also found that the magnetic state of all samples at T = 10 and 13 K is weak ferromagnetic or ferrimagnetic state but not the antiferromagnetic state in theory. The value of magnetic susceptibility and saturation magnetisation are effectively enhanced by changing calcining temperature. The relationship between the microstructure and magnetic properties of CuFeO2 system is discussed in this paper.


Ferroelectrics | 2015

Microstructure and Dielectric Properties of SnO2-doped CaCu3Ti4O12 Ceramics

Huiwen Xiang; Zhenping Chen; Dewei Liu; Haiyang Dai; Tao Li; Wenjing Zhang

Dielectric CaCu3Ti4O12-xSnO2 ceramics (x = 0, 0.003, 0.006, 0.010, 0.015 and 0.020) have been synthesized by solid-state reaction method. The microstructure was studied by X-ray diffraction, Raman spectrum and Scanning electron microscope. It is revealed that SnO2-doping results in the distortion of crystal structure and various grain growths for CaCu3Ti4O12-based ceramics. Dielectric measurement shows that lower-doped samples (x = 0.003 and 0.006) exhibit enhanced dielectric constants which are over 70,776 and 26,406 at the range of 40-104 Hz, respectively. In addition, the dielectric properties are explained in terms of internal barrier layer capacitance model by using the impedance spectroscopy analysis.


Journal of Materials Science: Materials in Electronics | 2018

The structure, defects, electrical and magnetic properties of BiFe 1− x Zr x O 3 multiferroic ceramics

Haiyang Dai; L. T. Gu; Xinyu Xie; Tao Li; Zhenping Chen; Z. J. Li

BiFe1−xZrxO3 (x = 0.00–0.30) ceramics were synthesized using solid state reaction method followed by rapid liquid phase sintering, and the microstructure, electrical and magnetic properties of the synthesized ceramics were systematically investigated. The XRD patterns show that no impurity phases exist in Zr doped samples; Zr doping induces the crystal structure distortion when x ≤ 0.10, and a structural phase transition occurs when the content of Zr varies from 0.10 to 0.20. SEM observations indicate that the average grain size is remarkably decreased by Zr doping. Positron annihilation lifetime spectra results indicate that cation vacancy-type defects exist in all samples, the cation vacancy concentration increases with increasing Zr content from 0.00 to 0.20, and then decreases with further increase of Zr content. Electrical and magnetic measurements show that enhanced leakage, ferroelectric and magnetic properties are observed in Zr doped ceramics. The analysis of microstructure and properties show that the cation vacancy defect plays an important role in modulating the electrical and magnetic properties of BiFeO3.


Ferroelectrics | 2016

Effect of CaCu3Ti4O12 modification on the structural, electrical and magnetic properties of BiFeO3 ceramics

Jing Chen; Haiyang Dai; Zhenping Chen; Tao Li; Dewei Liu

ABSTRACT The polycrystalline samples of (1−x)BiFeO3-xCaCu3Ti4O12 (x = 0, 0.05, 0.10 and 0.15) were synthesized by solid state reaction method followed by rapid liquid phase sintering. The effects of CaCu3Ti4O12 (CCTO) doping on the microstructure, dielectric and magnetic properties of BiFeO3 (BFO) ceramics were studied by changing CCTO concentrations. The XRD analysis reveals that that a little amount of CCTO as a solid solution in the BFO phase leads to expanding the lattice, no phase transition has occurred in the doping content range, but CCTO doping induces the crystal structure distortion. Impedance spectroscopy results show that the doped BFO ceramics have a broadband stability of the dielectric constant and dielectric loss on frequency, the CCTO doping can improve the dielectric constant and reduce dielectric loss of BFO. It is also observed that an increase in CCTO doping concentration in BFO can improve the magnetic properties of BFO.


Applied Physics A | 2013

Structure and multiferroic properties of Eu-substituted BiFeO3 ceramics

Haiyang Dai; Zhenping Chen; Renzhong Xue; Tao Li; Haizeng Liu; Yongqiang Wang


Ceramics International | 2014

Effect of Eu, Ti co-doping on the structural and multiferroic properties of BiFeO3 ceramics

Haiyang Dai; Renzhong Xue; Zhenping Chen; Tao Li; Jing Chen; Huiwen Xiang


Journal of Alloys and Compounds | 2014

Effect of defect on the nonlinear and dielectric property of Ca(1–x)SrxCu3Ti4O12 ceramics synthesized by sol–gel process

Tao Li; Dewei Liu; Haiyang Dai; Huiwen Xiang; Zhenping Chen; Huifang He; Zhiquan Chen


Journal of Alloys and Compounds | 2016

Studies on the structural, electrical and magnetic properties of Ce-doped BiFeO3 ceramics

Haiyang Dai; Tao Li; Zhenping Chen; Dewei Liu; Renzhong Xue; Chengzhou Zhao; Haizeng Liu; Ningkang Huang


Materials Research Bulletin | 2015

Effects of rare earth ionic doping on microstructures and electrical properties of CaCu3Ti4O12 ceramics

Renzhong Xue; Zhenping Chen; Haiyang Dai; Dewei Liu; Tao Li; Gaoyang Zhao


Journal of Non-crystalline Solids | 2013

Analysis of hydrogenated amorphous carbon films deposited by middle frequency pulsed unbalanced magnetron sputtering

Haiyang Dai; Jing Chen; Renzhong Xue; Tao Li; Zhenping Chen

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Zhenping Chen

Zhengzhou University of Light Industry

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Tao Li

Zhengzhou University of Light Industry

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Renzhong Xue

Zhengzhou University of Light Industry

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Jing Chen

Zhengzhou University of Light Industry

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Dewei Liu

Zhengzhou University of Light Industry

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Huiwen Xiang

Zhengzhou University of Light Industry

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Yuncai Xue

Zhengzhou University of Light Industry

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Haizeng Liu

Zhengzhou University of Light Industry

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Xinyu Xie

Zhengzhou University of Light Industry

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