文献类型：期刊文献

英文题名：Rational Sol-Gel-Based Synthesis Design and Magnetic, Dielectric, and Optical Properties Study of Nanocrystalline Sr3Co2WO9 Triple Perovskite

作者：Bijelic, Jelena[1];Stankovic, Anamarija[1];Medvidovic-Kosanovic, Martina[1];Markovic, Berislav[1];Cop, Pascal[2];Sun, Yu[2,3];Hajra, Sugato[4];Sahu, Manisha[4];Vukmirovic, Jelena[5];Markovic, Dean[6];Kukovecz, Akos[7];Jaglicic, Zvonko[8,9];Smarsly, Bernd M.[2];Djerdj, Igor[1]

机构：[1]Josip Juraj Strossmayer Univ Osijek, Dept Chem, HR-31000 Osijek, Croatia;[2]Justus Liebig Univ, Phys Chem Inst, D-35392 Giessen, Germany;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[4]Siksha O Anusandhan Deemed Be Univ, Inst Tech Educ & Res, Dept Elect & Elect Engn, Bhubaneswar 751030, India;[5]Univ Novi Sad, Fac Technol, Novi Sad 21101, Serbia;[6]Univ Rijeka, Dept Biotechnol, HR-51000 Rijeka, Croatia;[7]Univ Szeged, Dept Appl & Environm Chem, Interdisciplinary Excellence Ctr, H-6720 Szeged, Hungary;[8]Univ Ljubljana, Fac Civil & Geodet Engn, SI-1000 Ljubljana, Slovenia;[9]Univ Ljubljana, Inst Math & Phys & Mech, SI-1000 Ljubljana, Slovenia

年份：2020

卷号：124

期号：23

起止页码：12794

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20202908942339);WOS:【SCI-EXPANDED(收录号:WOS:000541745800066)】；

基金：This work has been fully supported by the Croatian Science Foundation under Project Number IP-2016-06-3115, entitled "Solution chemistry routes towards complex multiferroic materials". Furthermore, this project was also partially supported by the Slovenian Research Agency (Grant No. P20348) and by the Hungarian National Research, Development and Innovation Office through the GINOP-2.3.2-15-201600013 "Intelligent materials based on functional surfaces-from syntheses to applications" project, the 2018-2.1.12-TE'T-HR2018-00009 project and the Ministry of Human Capacities, Hungary, Grant 20391-3/2018/FEKUSTRAT. We are thankful to Tama ' s Varga and Daniel Berkesi from the Department of Applied and Environmental Chemistry of the University of Szeged for performing TEM and SAED measurements. We also thank Dominique Schupfer from the Institute of Physics and Felix Badaczewski from the Institute for Physical Chemistry, Justus Liebig Universitat Giessen, for performing Raman measurements. Professor R. N. P. Choudhary is thanked for taking full dielectric measurements in his laboratory. Last, but not least, J.B., A.S. and I.Dj. are thankful to their master students Marina Sekulic, Dominik Goman, and Filip Bolic ' for helping with sample preparation for various measurements.

语种：英文

外文关键词：Crystallite size - Magnetic moments - Crystal structure - Ground state - Perovskite - Nanocrystals - Rietveld analysis - Sol-gel process - Optical properties - Magnetic materials - Sol-gels

摘要：Complex perovskites have attracted extensive attention due to their fascinating physical properties and novel features owing to the coexistence of the ferro-/ferri-magnetic ground state and semiconducting behavior in the single material. Herein, the triple perovskite Sr3Co2WO9 (SCWO) has been successfully synthesized for the first time in the nanocrystalline form with an average crystallite size of 23 nm using a high yield (81%) aqueous citrate sol-gel method. At room temperature, the crystal structure of Sr3Co2WO9 is cubic, space group Fm (3) over barm, with lattice parameter a = 7.9073(6) angstrom. The formation of SCWO triple perovskite was studied in situ by X-ray diffraction and subsequently analyzed by the Rietveld analysis. The detected hysteresis loops with nonzero remanent magnetization and rather large coercive field reveal ferrimagnetic ordering with a Curie temperature of 144 K. The measured effective magnetic moment of mu(B) is close to the expected value for the rarely observed intermediate spin S = 1. It is found that the compound exhibits semiconducting properties with the optical band gaps equal to 3.52 eV (indirect) and 3.76 eV (direct), respectively, further confirmed by the determination of the AC conductivity, which in the measured temperature range (25-500 degrees C at 1 kHz) lies within the interval from 10(-5)-10(-4) Omega(-1) cm(-1). The Maxwell-Wagner model is employed to describe the frequency dependent dielectric constant. The frequency-dependent AC conductivity follows the universal Jonscher power law. Since it possesses both magnetic and semiconductor properties, this material could be a promising candidate to use in devices where its semiconducting properties would be spin-controlled.