Study of oxygen-ion conductivity and luminescence in the ZrO2-Nd2O3 system: Impact of local heterogeneity

被引：15

作者：

Lyskov, N. V. ^{[1
,2
]}

Shchegolikhin, A. N. ^{[3
]}

Stolbov, D. N. ^{[4
]}

Kolbanev, I. V. ^{[5
]}

Gomes, E. ^{[6
]}

Abrantes, J. C. C. ^{[6
,7
]}

Shlyakhtina, A. V. ^{[5
,8
,9
]}

机构：

[1] RAS, Inst Problems Chem Phys, Chernogolovka, Moscow Reg, Russia

[2] HSE Univ, Myasnitskaya Str 20, Moscow 101000, Russia

[3] RAS, Emanuel Inst Biochem Phys, Moscow, Russia

[4] Lomonosov Moscow State Univ, Dept Chem, Leninskie Gory 1-3, Moscow 119991, Russia

[5] Russian Acad Sci, NN Semenov Fed Res Ctr Chem Phys, Moscow, Russia

[6] Inst Politecn Viana Castelo, ProMetheus, Viana Do Castelo, Portugal

[7] Univ Aveiro, CICECO Aveiro Inst Mat, P-3810193 Aveiro, Portugal

[8] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Moscow, Russia

[9] Inst Himiceskoj Fiziki Imeni N Semenova RAN, Kinet & Catalysis, Ul Kosygina 4, Moscow 119991, Moscow, Russia

来源：

ELECTROCHIMICA ACTA | 2022年 / 403卷

基金：

俄罗斯科学基金会;

关键词：

Zirconates; Pyrochlores; Fluorites; Oxygen-ion conductivity; Proton conductivity; Luminescence; Nanodomains; CRYSTAL-STRUCTURE; OPTICAL-PROPERTIES; PYROCHLORE; ZIRCONIA; STABILITY; CERAMICS; MICROSTRUCTURE; NANOPARTICLES; TRANSPORT; FLUORITE;

D O I：

10.1016/j.electacta.2021.139632

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Stabilized fluorites and pyrochlores with different types of substitution in the (Nd2O3 - ZrO2 system (NdZrO)) have been studied by Raman spectroscopy, X-ray diffraction, and impedance spectroscopy methods. Ionic and proton conductivity maps for 9 compositions in the NdZrO system are presented. Oxygen partial pressure measurements show a typical ionic conductor behavior, with a significantly increase of conductivity for (Nd2-xZrx)Zr2O7+x/2 (x = 1.27) fluorite and (Nd2-xZrx)Zr2O7+x/2 ( x = 0.4, 0.2) pyrochlores. For the same compositions the strong luminescence was observed. Strong luminescence and high oxygen ion conductivity of these solid solutions can be associated with the presence of phases with the different degree of structural disorder (tetragonal phase, fluorite) in local nanodomains in fluorite or pyrochlore matrix in the ZrO2 - Nd2Zr2O7 region. Really, Raman spectra of (Nd2-xZrx)Zr2O7+x/2 ( x = 0.5 - 0.2) solid solutions demonstrated the fluorite + pyrochlore structural type in the short-range order. Fluorite nanodomains in pyrochlore matrix (ZrO2 - Nd2Zr2O region) resulting from an order-disorder transition can only be detected at a radiation wavelength comparable to the fluorite nanodomain size. Thus, using Raman spectroscopy the broad isomorphism range in theZrO(2) - Nd2Zr2O system has been shown to be nonuniform. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页数：10

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