Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln1-xSrx(Co,Cr,Fe,Mn,Ni)O3-δ (Ln = La, Pr, Nd, Sm or Gd) Perovskites

被引:14
作者
Dabrowa, Juliusz [1 ]
Zielinska, Klaudia [2 ]
Stepien, Anna [2 ]
Zajusz, Marek [1 ]
Nowakowska, Margarita [1 ]
Mozdzierz, Maciej [2 ]
Berent, Katarzyna [3 ]
Szymczak, Maria [1 ]
Swierczek, Konrad [2 ,4 ]
机构
[1] AGH Univ Sci & Technol, Fac Mat Sci & Ceram, Al Mickiewicza 30, PL-30059 Krakow, Poland
[2] AGH Univ Sci & Technol, Fac Energy & Fuels, Al Mickiewicza 30, PL-30059 Krakow, Poland
[3] AGH Univ Sci & Technol, Acad Ctr Mat & Nanotechnol, Al Mickiewicza 30, PL-30059 Krakow, Poland
[4] AGH Univ Sci & Technol, AGH Ctr Energy, Ul Czarnowiejska 36, PL-30054 Krakow, Poland
关键词
high entropy oxides; perovskites; structural properties; electrical properties; CRYSTAL-STRUCTURE; ELECTRONIC CONDUCTIVITY; MAGNETIC-PROPERTIES; RARE-EARTH; OXIDES; CATHODES;
D O I
10.3390/ma14185264
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
Phase composition, crystal structure, and selected physicochemical properties of the high entropy Ln(Co,Cr,Fe,Mn,Ni)O3-delta (Ln = La, Pr, Gd, Nd, Sm) perovskites, as well as the possibility of Sr doping in Ln(1-x)Sr(x)(Co,Cr,Fe,Mn,Ni)O3-delta series, are reported is this work. With the use of the Pechini method, all undoped compositions are successfully synthesized. The samples exhibit distorted, orthorhombic or rhombohedral crystal structure, and a linear correlation is observed between the ionic radius of Ln and the value of the quasi-cubic perovskite lattice constant. The oxides show moderate thermal expansion, with a lack of visible contribution from the chemical expansion effect. Temperature-dependent values of the total electrical conductivity are reported, and the observed behavior appears distinctive from that of non-high entropy transition metal-based perovskites, beyond the expectations based on the rule-of-mixtures. In terms of formation of solid solutions in Sr-doped Ln(1-x)Sr(x)(Co,Cr,Fe,Mn,Ni)O3-delta materials, the results indicate a strong influence of the Ln radius, and while for La-based series the Sr solubility limit is at the level of x(max) = 0.3, for the smaller Pr it is equal to just 0.1. In the case of Nd-, Sm- and Gd-based materials, even for the x(Sr) = 0.1, the formation of secondary phases is observed on the SEM + EDS images.
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页数:16
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