Dense YMn₂O₅ Ceramics Prepared by Spark Plasma Sintering

Abstract

Dense multiferroic YMn2O5 ceramics with a single orthorhombic phase are quite difficult to prepare because the orthorhombic phase decomposes at about 1180°C. In this study, spark plasma sintering (SPS) was investigated to synthesize YMn2O5 ceramics. The sample sintered at 900°C for 5 min by SPS consisted of the main orthorhombic YMn2O5 phase and a small amount of hexagonal YMnO3 phase and Mn3O4. After heat treatment at 1100°C for 9 h, YMn2O5 ceramics in a single orthorhombic phase with a relative density of 94% were obtained. The results suggested that SPS is a promising process for preparing ceramics whose optimal sintering temperatures are higher than their decomposition temperatures.

Effect of Sintering Temperature on Structural, Dielectric, and Magnetic Properties of Multiferroic YFeO3 Ceramics Fabricated by Spark Plasma Sintering

“…Accordingly, this transformation can occur in the 1050 °C-sintered sample. This behavior is in accordance with the finding reported in [27]. In summary, the unique YFeO 3 phase without impurities can only be acquired for the 1000 °C-sintered sample, which is 300–400 °C lower compared to conventional methods.…”

Dielectric properties of La1.75Ba0.25NiO4 ceramics prepared by spark plasma sintering

“…On the other hand, the spark plasma sintering (SPS) method has been used widely as a low temperature and rapid sintering method in the past decade [19][20][21][22][23][24][25]. The dense ceramics with smaller grain size, for example, nano-scale, can be easily prepared by SPS method because of its much lower sintering temperature and time [25].…”

Subsolidus Phase Relations of the BaO–Y2O3–MnO2 System in Air

“…Three compounds, YMnO 3 , YMn 2 O 5 , and Y 2 Mn 2 O 7 , have been reported in the system . YMnO 3 has three modifications: two hexagonal phases ( h F / h p ‐YMnO 3 ) and an orthorhombic phase ( o ‐YMnO 3 ) .…”

“…Compound YMn 2 O 5 has an orthorhombic structure in S.G. Pbam with a = 7.2639 (2), b = 8.4758 (2) and c = 5.6673 (1) Å at room temperature . Gao et al . reported that the YMn 2 O 5 compound was easily synthesized at 1100°C, but decomposed into YMnO 3 and Mn 3 O 4 at 1200°C.…”