caa a22 4500 605545782 CHVBK 20210128100937.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00723-015-0700-5 doi (NATIONALLICENCE)springer-10.1007/s00723-015-0700-5 Crucial Role of Site Disorder and Frustration in Unusual Magnetic Properties of Quasi-2D Triangular Lattice Antimonate Na4FeSbO6 [Elektronische Daten] [Elena Zvereva, Igor Presniakov, Myung-Hwan Whangbo, Hyun-Joo Koo, Tatyana Frantsuzenko, Olga Savelieva, Alexey Sobolev, Vladimir Nalbandyan, Pei-Shan Shih, Jen-Che Chiang, Jenn-Min Lee, Jin-Ming Chen, Jiunn-Yuan Lin, Bernd Büchner, Alexander Vasiliev] The effect of antisite disorder in the layered sodium iron antimonate Na4FeSbO6 was examined both experimentally and theoretically. The magnetic susceptibility and specific heat measurements show that Na4FeSbO6 does not undergo a long-range antiferromagnetic order, unlike its structural analog Li4FeSbO6. The electron spin resonance yields the complicated picture of coexistence of two magnetic subsystems corresponding to two different Fe cation positions in the lattice (regular and antisite) and driving the magnetic properties of the Na4FeSbO6. This conclusion found perfect confirmation from both the Mössbauer and X-ray absorption data which show the presence of two kinds of Fe3+ ions being in high-spin Fe3+ (S=5/2) and low-spin Fe3+ (S=1/2) states. These findings arise from the antisite disorder between the Fe3+ and Sb5+ ions in the (NaFeSbO6)3− layers of Na4FeSbO6. Our density functional calculations show that the Fe3+ ions located at the Sb5+ sites exist as low-spin Fe3+ ions, and that the spins of each Fe3+ (S=5/2)-Fe3+ (S=1/2)-Fe3+ (S=5/2) trimer generated by the antisite disorder has a ferrimagnetic arrangement Fe3+↑-Fe3+↓-Fe3+↑, which enhances the magnetization of Na4FeSbO6 and leads to an apparently positive Curie-Weiss temperature. Springer-Verlag Wien, 2015 Zvereva Elena Faculty of Physics, Moscow State University, 119991, Moscow, Russia aut Presniakov Igor Chemistry Faculty, Moscow State University, 119991, Moscow, Russia aut Whangbo Myung-Hwan Department of Chemistry, North Carolina State University, 27695-8204, Raleigh, NC, USA aut Koo Hyun-Joo Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, 130-701, Seoul, Republic of Korea aut Frantsuzenko Tatyana Faculty of Physics, Moscow State University, 119991, Moscow, Russia aut Savelieva Olga Faculty of Physics, Moscow State University, 119991, Moscow, Russia aut Sobolev Alexey Chemistry Faculty, Moscow State University, 119991, Moscow, Russia aut Nalbandyan Vladimir Chemistry Faculty, Southern Federal University, 344090, Rostov-on-Don, Russia aut Shih Pei-Shan Institute of Physics, National Chiao Tung University, 30010, Hsinchu, Taiwan aut Chiang Jen-Che Institute of Physics, National Chiao Tung University, 30010, Hsinchu, Taiwan aut Lee Jenn-Min National Synchrotron Radiation Research Center, 30076, Hsinchu, Taiwan aut Chen Jin-Ming National Synchrotron Radiation Research Center, 30076, Hsinchu, Taiwan aut Lin Jiunn-Yuan Institute of Physics, National Chiao Tung University, 30010, Hsinchu, Taiwan aut Büchner Bernd Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069, Dresden, Germany aut Vasiliev Alexander Faculty of Physics, Moscow State University, 119991, Moscow, Russia aut Applied Magnetic Resonance Springer Vienna 46/10(2015-10-01), 1121-1145 0937-9347 46:10<1121 2015 46 723 https://doi.org/10.1007/s00723-015-0700-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00723-015-0700-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zvereva Elena Faculty of Physics, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Presniakov Igor Chemistry Faculty, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Whangbo Myung-Hwan Department of Chemistry, North Carolina State University, 27695-8204, Raleigh, NC, USA aut NATIONALLICENCE 700 1- Koo Hyun-Joo Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, 130-701, Seoul, Republic of Korea aut NATIONALLICENCE 700 1- Frantsuzenko Tatyana Faculty of Physics, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Savelieva Olga Faculty of Physics, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Sobolev Alexey Chemistry Faculty, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Nalbandyan Vladimir Chemistry Faculty, Southern Federal University, 344090, Rostov-on-Don, Russia aut NATIONALLICENCE 700 1- Shih Pei-Shan Institute of Physics, National Chiao Tung University, 30010, Hsinchu, Taiwan aut NATIONALLICENCE 700 1- Chiang Jen-Che Institute of Physics, National Chiao Tung University, 30010, Hsinchu, Taiwan aut NATIONALLICENCE 700 1- Lee Jenn-Min National Synchrotron Radiation Research Center, 30076, Hsinchu, Taiwan aut NATIONALLICENCE 700 1- Chen Jin-Ming National Synchrotron Radiation Research Center, 30076, Hsinchu, Taiwan aut NATIONALLICENCE 700 1- Lin Jiunn-Yuan Institute of Physics, National Chiao Tung University, 30010, Hsinchu, Taiwan aut NATIONALLICENCE 700 1- Büchner Bernd Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069, Dresden, Germany aut NATIONALLICENCE 700 1- Vasiliev Alexander Faculty of Physics, Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Applied Magnetic Resonance Springer Vienna 46/10(2015-10-01), 1121-1145 0937-9347 46:10<1121 2015 46 723