Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln<sub>1−x</sub>Sr<sub>x</sub>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Nd, Sm or Gd) Perovskites
Phase composition, crystal structure, and selected physicochemical properties of the high entropy Ln(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Gd, Nd, Sm) perovskites, as well as the possibility of Sr doping in Ln<sub>1<i>−x</i></sub>Sr<i><sub>x<...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2021-09-01
|
Series: | Materials |
Subjects: | |
Online Access: | https://www.mdpi.com/1996-1944/14/18/5264 |
id |
doaj-ebd542e2863e4f309566c7b6290c0be8 |
---|---|
record_format |
Article |
spelling |
doaj-ebd542e2863e4f309566c7b6290c0be82021-09-26T00:36:35ZengMDPI AGMaterials1996-19442021-09-01145264526410.3390/ma14185264Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln<sub>1−x</sub>Sr<sub>x</sub>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Nd, Sm or Gd) PerovskitesJuliusz Dąbrowa0Klaudia Zielińska1Anna Stępień2Marek Zajusz3Margarita Nowakowska4Maciej Moździerz5Katarzyna Berent6Maria Szymczak7Konrad Świerczek8Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandFaculty of Energy and Fuels, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandFaculty of Energy and Fuels, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandFaculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandFaculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandFaculty of Energy and Fuels, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandAcademic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandFaculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandFaculty of Energy and Fuels, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, PolandPhase composition, crystal structure, and selected physicochemical properties of the high entropy Ln(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Gd, Nd, Sm) perovskites, as well as the possibility of Sr doping in Ln<sub>1<i>−x</i></sub>Sr<i><sub>x</sub></i>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> 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<sub>1−<i>x</i></sub>Sr<i><sub>x</sub></i>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> 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<sub>max</sub> = 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<sub>Sr</sub> = 0.1, the formation of secondary phases is observed on the SEM + EDS images.https://www.mdpi.com/1996-1944/14/18/5264high entropy oxidesperovskitesstructural propertieselectrical properties |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Juliusz Dąbrowa Klaudia Zielińska Anna Stępień Marek Zajusz Margarita Nowakowska Maciej Moździerz Katarzyna Berent Maria Szymczak Konrad Świerczek |
spellingShingle |
Juliusz Dąbrowa Klaudia Zielińska Anna Stępień Marek Zajusz Margarita Nowakowska Maciej Moździerz Katarzyna Berent Maria Szymczak Konrad Świerczek Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln<sub>1−x</sub>Sr<sub>x</sub>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Nd, Sm or Gd) Perovskites Materials high entropy oxides perovskites structural properties electrical properties |
author_facet |
Juliusz Dąbrowa Klaudia Zielińska Anna Stępień Marek Zajusz Margarita Nowakowska Maciej Moździerz Katarzyna Berent Maria Szymczak Konrad Świerczek |
author_sort |
Juliusz Dąbrowa |
title |
Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln<sub>1−x</sub>Sr<sub>x</sub>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Nd, Sm or Gd) Perovskites |
title_short |
Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln<sub>1−x</sub>Sr<sub>x</sub>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Nd, Sm or Gd) Perovskites |
title_full |
Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln<sub>1−x</sub>Sr<sub>x</sub>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Nd, Sm or Gd) Perovskites |
title_fullStr |
Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln<sub>1−x</sub>Sr<sub>x</sub>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Nd, Sm or Gd) Perovskites |
title_full_unstemmed |
Formation of Solid Solutions and Physicochemical Properties of the High-Entropy Ln<sub>1−x</sub>Sr<sub>x</sub>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Nd, Sm or Gd) Perovskites |
title_sort |
formation of solid solutions and physicochemical properties of the high-entropy ln<sub>1−x</sub>sr<sub>x</sub>(co,cr,fe,mn,ni)o<sub>3−δ</sub> (ln = la, pr, nd, sm or gd) perovskites |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2021-09-01 |
description |
Phase composition, crystal structure, and selected physicochemical properties of the high entropy Ln(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> (Ln = La, Pr, Gd, Nd, Sm) perovskites, as well as the possibility of Sr doping in Ln<sub>1<i>−x</i></sub>Sr<i><sub>x</sub></i>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> 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<sub>1−<i>x</i></sub>Sr<i><sub>x</sub></i>(Co,Cr,Fe,Mn,Ni)O<sub>3−δ</sub> 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<sub>max</sub> = 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<sub>Sr</sub> = 0.1, the formation of secondary phases is observed on the SEM + EDS images. |
topic |
high entropy oxides perovskites structural properties electrical properties |
url |
https://www.mdpi.com/1996-1944/14/18/5264 |
work_keys_str_mv |
AT juliuszdabrowa formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites AT klaudiazielinska formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites AT annastepien formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites AT marekzajusz formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites AT margaritanowakowska formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites AT maciejmozdzierz formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites AT katarzynaberent formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites AT mariaszymczak formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites AT konradswierczek formationofsolidsolutionsandphysicochemicalpropertiesofthehighentropylnsub1xsubsrsubxsubcocrfemnniosub3dsublnlaprndsmorgdperovskites |
_version_ |
1716870301991567361 |