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. 2017 Apr 28;10(5):474.
doi: 10.3390/ma10050474.

Enhanced Multiferroic Properties of YMnO₃ Ceramics Fabricated by Spark Plasma Sintering Along With Low-Temperature Solid-State Reaction

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Free PMC article

Enhanced Multiferroic Properties of YMnO₃ Ceramics Fabricated by Spark Plasma Sintering Along With Low-Temperature Solid-State Reaction

Meng Wang et al. Materials (Basel). .
Free PMC article

Abstract

Based on precursor powders with a size of 200-300 nm prepared by the low-temperature solid-state reaction method, phase-pure YMnO₃ ceramics are fabricated using spark plasma sintering (SPS). X-ray diffraction (XRD) and scanning electron microscopy (SEM) reveal that the high-purity YMnO₃ ceramics can be prepared by SPS at 1000 °C for 5 minutes with annealing at 800 °C for 2 h. The relative density of the sample is as high as 97%, which is much higher than those of the samples sintered by other methods. The present dielectric and magnetic properties are much better than those of the samples fabricated by conventional methods and SPS with ball-milling precursors, and the ferroelectric loops at room temperature can be detected. These findings indicate that the YMnO₃ ceramics prepared by the low temperature solid reaction method and SPS possess excellent dielectric lossy ferroelectric properties at room temperature, and magnetic properties at low temperature (10 K), making them suitable for potential multiferroic applications.

Keywords: dielectric properties; ferroelectric properties; low-temperature solid-state reaction; magnetic properties; multiferroic materials; spark plasma sintering.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) XRD pattern and (b) SEM micrograph for YMnO3 powders.
Figure 1
Figure 1
(a) XRD pattern and (b) SEM micrograph for YMnO3 powders.
Figure 2
Figure 2
XRD patterns for YMnO3 samples (a) as SPS and (b) after annealing.
Figure 3
Figure 3
SEM micrograph of fracture surface of the YMnO3 ceramics.
Figure 4
Figure 4
Temperature dependence of (a) dielectric constant and (b) dielectric loss under frequencies of 1, 10, 100, and 1000 kHz for the YMnO3 ceramics.
Figure 5
Figure 5
Complex impedance plots at different temperatures.
Figure 6
Figure 6
Temperature dependence of resistivity for YMnO3 ceramics.
Figure 7
Figure 7
Ferroelectric hysteresis loop of the YMnO3 ceramic at room temperature.
Figure 8
Figure 8
Magnetic hysteresis loop of the YMnO3 ceramic at 10 K.

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