Details

Autor(en) / Beteiligte

• Wang, Yuhao
• Jin, Yu-Jun
• Ding, Zhao-Ying
• Cao, Gui
• Liu, Zhan-Guo
• Wei, Tao
• Ouyang, Jia-Hu
• Wang, Ya-Ming
• Wang, Yu-Jin

Titel

Microstructure and electrical properties of new high-entropy rare-earth zirconates

Ist Teil von

• Journal of alloys and compounds, 2022-06, Vol.906, p.164331, Article 164331

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2022

Quelle

ScienceDirect

Beschreibungen/Notizen

• •Five kinds of pyrochlore high-entropy rare-earth zirconates have been prepared.•High-entropy strategy improves the electrical conductivity of rare-earth zirconate.•(Nd0.2Eu0.2Sm0.2Gd0.2Dy0.2)2Zr2O7 has a conductivity of 7.1 × 10–3 S·cm–1 at 1073 K.•Higher mobile vacancy concentrations, lower activation energy and the preferential O-ion migration pathway result the enhanced ion conductivity. In the present work, a series of new high-entropy rare-earth zirconates were prepared by a solid state reaction method. The crystal structure, microstructure and electrical properties of high-entropy rare-earth zirconates were characterized by means of X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy and electrochemical impedance spectroscopy. All the high-entropy rare-earth zirconates have a single-phase pyrochlore structure with a relative density of more than 95.7%. The grain sizes of high-entropy rare-earth zirconates are 1.3–2.4 µm, which are finer than low-entropy rare-earth zirconates prepared by the same process. (Nd0.2Sm0.2Eu0.2Gd0.2Dy0.2)2Zr2O7 has the excellent electrical conductivity of 7.1 × 10–3 S·cm–1 at 1073 K.