文献类型：期刊文献

英文题名：Mild Hydrothermal Crystallization of Heavy Rare-Earth Chromite RECrO3 (RE = Er, Tm, Yb, Lu) Perovskites and Magnetic Properties

作者：Wang, Shan[1,2];Wu, Xiaofeng[3];Wang, Tiesheng[4];Zhang, Jiaqi[2,3];Zhang, Chenyang[5];Yuan, Long[6];Cui, Xiaoqiang[2];Lu, Dayong[1]

第一作者：Wang, Shan

通讯作者：Lu, DY[1];Zhang, JQ[2];Zhang, JQ[3];Yuan, L[4]

机构：[1]Jilin Inst Chem Technol, Dept Mat Sci & Engn, Key Lab Special Funct Mat Jilin Prov Univ, 45 Chengde St, Jilin 132022, Jilin, Peoples R China;[2]Jilin Univ, Coll Mat Sci & Engn, Changchun 130012, Jilin, Peoples R China;[3]Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Jilin, Peoples R China;[4]Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England;[5]Xinxiang Univ, Dept Chem & Chem Engn, Xinxiang 453003, Peoples R China;[6]Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Changchun 130103, Jilin, Peoples R China

第一机构：Jilin Inst Chem Technol, Dept Mat Sci & Engn, Key Lab Special Funct Mat Jilin Prov Univ, 45 Chengde St, Jilin 132022, Jilin, Peoples R China

通讯机构：[1]corresponding author), Jilin Inst Chem Technol, Dept Mat Sci & Engn, Key Lab Special Funct Mat Jilin Prov Univ, 45 Chengde St, Jilin 132022, Jilin, Peoples R China;[2]corresponding author), Jilin Univ, Coll Mat Sci & Engn, Changchun 130012, Jilin, Peoples R China;[3]corresponding author), Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Jilin, Peoples R China;[4]corresponding author), Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Changchun 130103, Jilin, Peoples R China.

年份：2019

卷号：58

期号：4

起止页码：2315-2329

外文期刊名：INORGANIC CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000459367300012)】；

基金：This work was supported by the "Thirteenth Five Year" Project (No. JJKH20170217KJ) of Science and Technology Research in the Education Department of Jilin Province and the projects of National Natural Science Foundations of China (Grant No. 51801171 and 21271084) and of Jilin Province (20160101290JC), Changbai Mountain Scholar Distinguished Professor (2015047). L.Y. thanks the support of startup project for Ph.D of Jilin Normal University. T.W. thanks the China Scholarship Council (CSC) for funding and EPSRC Centre for Doctoral Training in Sensor Technologies and Applications (EP/L015889/1 and 1566990) for support. JZ acknowledges the National Science Foundation of Jilin Province (grant: 20190201208JC), the Science and Technology Foundation of Department of Education, Jilin Province (grant: JJKH20190136KJ) and the Open Foundation of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University (Grant: 2019-24)

语种：英文

摘要：Crystallization of perovskite structure chromites (ACrO(3)) in aqueous conditions is difficult owing to the amphoteric nature of the Cr3+ in the alkaline-mediated reaction conditions. This is especially true for the small metal cations at the A-site with large distortion angle of CrO6 octahedral and small Goldschmidt tolerance factors. Here, we performed a progressive dehydration crystallization strategy to synthesize four RECrO3 with the smallest radii of rare earth elements (Er, Tm, Yb, Lu) in mild hydrothermal conditions. Profile refinement of the high-resolution powder X-ray diffraction results indicated slightly longer unit cell parameters of a and c in our samples with a higher distorted angle of CrO6 octahedral units along < 010 > direction. All of the samples show rounded rectangle plate morphology with uniform distribution of particle sizes. These four RECrO3 crystals can only form in a very narrow mineralization temperature range, i.e., 260-280 degrees C and 4.45-6.24 M of KOH. HRTEM results indicated that the normal crystallographic direction is < 001 >, and the lattice of steps at the edge of elliptic rounded crystal is consistent with the bulk, which demonstrated single crystalline nature of the as-obtained crystals. Room temperature Raman and FT-IR spectra reveal a continuous symmetry mode shift-dependent on the radii of A-site rare-earth cations. Temperature-dependent magnetization curves of RECrO3 show typical antiferromagnetism to paramagnetism transition with Neel temperature of 93, 90, 86, and 83 K for ErCrO3, TmCrO3, YbCrO3, and LuCrO3, respectively. Samples of YbCrO3 and LuCrO3 show clear magnetization reversal and exchange bias phenomena below their Neel points. This paper indicates that the coupling of magnetic exchange in perovskite structure oxides could be tailorable in mild hydrothermal condition, towards the exploration of new magnetic and other physical properties.