Details

Autor(en) / Beteiligte

• Jin, Yu-Jun
• Liu, Zhan-Guo
• Cao, Gui
• Feng, Wei
• Chen, Lei
• Wang, Yu-Jin
• Ouyang, Jia-Hu

Titel

Order-disorder transition and electrical performance of (Nd1–xYx)2Zr2O7 solid solutions

Ist Teil von

• Journal of alloys and compounds, 2019-11, Vol.811, p.151974, Article 151974

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• (Nd1–xYx)2Zr2O7 solid solutions have been prepared by solid phase method. The influence of yttrium content on the structure and electrical performance has been explored. The crystal structure is characterized by X-ray diffraction and Raman spectroscopy. The morphology is investigated by scanning electron microscopy. The electrical property is analyzed by electrochemical impedance spectroscopy measurement. (Nd1–xYx)2Zr2O7 solid solutions exhibit a single-phase structure except that NdYZr2O7 shows a biphasic structure. As yttrium content x raises from 0 to 1, the order degree of (Nd1–xYx)2Zr2O7 solid solutions decreases gradually, and the structures of solid solutions transform from ordered pyrochlore-type structure to disordered defect fluorite-type structure. (Nd1–xYx)2Zr2O7 solid solutions are dense, and the relative densities are over 94%. The total conductivity of Nd2Zr2O7 is greatly enhanced by doping yttrium at the Nd-site in 823–1073 K. The total conductivity achieves 5.2 × 10−3 S cm−1 at 1073 K for (Nd0.6Y0.4)2Zr2O7, which is the highest valve of (Nd1–xYx)2Zr2O7 solid solutions. •(Nd1–xYx)2Zr2O7 show a single-phase structure except for NdYZr2O7.•Order-disorder transition takes place in (Nd1–xYx)2Zr2O7 solid solutions.•The total conductivity of Nd2Zr2O7 can be improved by doping Y2O3.•(Nd0.6Y0.4)2Zr2O7 has the highest conductivity at 1073 K in (Nd1–xYx)2Zr2O7 system.