Structural features of sodium- and halogen-containing fluorite-like rare-earth molybdates

被引：1

作者：

Antipin, Alexander M. ^{[1
]}

Orlova, Ekaterina I. ^{[1
,2
]}

Smirnova, Ekaterina S. ^{[1
]}

Trukhacheva, Maria P. ^{[1
,2
]}

Sorokin, Timofei A. ^{[1
]}

Sidorova, Ekaterina V. ^{[1
]}

Kharitonova, Elena P. ^{[1
,2
]}

Lyskov, Nikolay V. ^{[3
]}

Novikova, Natalia E. ^{[1
]}

Yapaskurt, Vasiliy O. ^{[4
]}

Sorokina, Natalia I. ^{[1
]}

Alekseeva, Olga A. ^{[1
]}

Voronkova, Valentina I. ^{[2
]}

机构：

[1] Natl Res Ctr Kurchatov Inst, Shubnikov Inst Crystallog, Kurchatov Complex Crystallog & Photon, Moscow, Russia

[2] Lomonosov Moscow State Univ, Fac Phys, Moscow, Russia

[3] Russian Acad Sci, Fed Res Ctr Problems Chem Phys & Med Chem, Chernogolovka, Russia

[4] Lomonosov Moscow State Univ, Fac Geol, Moscow, Russia

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2025年 / 27卷 / 07期

基金：

俄罗斯科学基金会;

关键词：

OXIDE-ION CONDUCTIVITY; CRYSTAL-STRUCTURE; FUEL-CELLS; ND5MO3O16; DIFFRACTION; PROTON; SYSTEM; SITE; PR; LA;

D O I：

10.1039/d4cp03982c

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Compounds of nominal composition NaLa4Mo3O15F1-xClx (x = 0-0.7) have been obtained for the first time as ceramics and single crystals. All the compounds belong to the cubic crystal system and are isostructural to undoped crystals of the Ln5Mo3O16 family (Ln = La-Gd). A study of the physical properties of the obtained phases has shown their significant change compared to undoped compounds and a reversible jump in conductivity near 600 degrees C. According to X-ray diffraction analysis, sodium atoms are localized near the positions of rare-earth cations La2, and halogen impurities enter partially occupied general positions of O2 atoms and the interstices formed by six La1 atoms. As the temperature increases, chlorine ions leave O2 positions and interstices. This increases the number of vacancies and creates new ion transport pathways. A jump in conductivity occurs when three conditions are simultaneously met: an increase in the number of vacancies, the appearance of new charge transport pathways, and, possibly, an increase in the mobility of the main charge carriers, oxygen ions, due to electrostatic repulsion between anions (O2-, F-, Cl-).

引用

页码：3897 / 3907

页数：11

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