Premium
Versatile Molten Salt Synthesis of Manganite Perovskite Oxide Nanocrystals and Their Magnetic Properties
Author(s) -
Gonell Francisco,
Alem Naoual,
Dunne Peter,
Crochet Guillaume,
Beaunier Patricia,
Méthivier Christophe,
Montero David,
LabertyRobert Christel,
Doudin Bernard,
Portehault David
Publication year - 2019
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201800632
Subject(s) - manganite , perovskite (structure) , nanocrystal , materials science , ferromagnetism , x ray photoelectron spectroscopy , oxide , nanotechnology , chemical engineering , crystallography , condensed matter physics , chemistry , metallurgy , physics , engineering
Manganite perovskite oxides exhibit a wide range of properties relevant for catalysis, energy conversion and spintronics. Such behaviors can be deeply modified at the nanoscale where confinement and surface effects may prevail. Interesting properties could then emerge from manganite perovskite nanocrystals, although their synthesis remains a challenge. The present study reports a versatile synthesis of manganite perovskite nanocrystals by using molten salts as high temperature liquids in the 600–750 °C range. Through X‐ray diffraction, X‐ray photoelectron spectroscopy, scanning and transmission electron microscopies, we show that many substitutions on the A perovskite site are within reach by applying the approach to La 2/3 Sr 1/3 MnO 3 , La 2/3 Ca 1/3 MnO 3 and La 1/3 Pr 1/3 Ca 1/3 MnO 3 cubic‐shape nanocrystals with diameter of 20, 22 and 38 nm, respectively. The magnetic properties of these nanocrystals are then investigated at 5 K, highlighting the coexistence of a ferromagnetic phase typical of the bulk, with disordered and non‐magnetic domains, which presumably arise from the nanoscale and surface effects.