Synthesis,crystal growth and structure,magnetic and electrical properties of Ba4Ru2FeO10 and Ba4Ru2CoO10 |
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| Institution: | 1. Department of Medical Imaging, Al-Azhar University, Gaza Strip, Palestine;2. Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441 Dammam, Saudi Arabia;3. Basic & Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441, Dammam, Saudi Arabia;4. Department of Physics, Al-Azhar University, Gaza Strip, Palestine;1. Department of Physics, Abdul Wali Khan University, Mardan, 23200, Pakistan;2. Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand;3. Physics Program, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand;4. Department of Physics, Kyungpook National University, Deagu, 702-701, Republic of Korea;1. Chiristian College, Kattakada, Thiruvananthapuram, India;2. Sree Ayyappa College for Women., Chunkankadai, Nagercoil 629003, India;1. Physics Department, College of Science & Arts, Najran University, P. O. 1988, Najran, Saudi Arabia;2. Reactor Physics Department, NRC, Atomic Energy Authority, Abou Zabaal P.O. 13759, Cairo, Egypt;3. Physics Department, Faculty of Science, Sohag University, Sohag 82524, Egypt;4. Physics Department, Aljamoum University College, Um-Elqura University, Makka, Saudi Arabia;5. Physics Department, Faculty of Science, Soltan Qaboos University, P.O. Box 36, PC 123, Muscatt, Oman;1. Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;2. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), 52425 Jülich, Germany;3. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Michael-Faraday-Street 1, 07629 Hermsdorf, Germany |
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| Abstract: | Crystals of Ba4Ru2FeO10 and Ba4Ru2CoO10 (Cmca, Z = 4, Ba4Ru2FeO10: a = 5.7899(1) Å, b = 13.2898(3) Å, c = 13.0098(4) Å, V = 1001.06 Å3; Ba4Ru2CoO10: a = 5.7691(2) Å, b = 13.2061(3) Å, c = 12.9755(4) Å, V = 988.57 Å3) were obtained from binary oxides and BaCoO3 at 1300 °C. Both compounds crystallize isostructural to Ba4Ru3O10 with different preference of the 3d metal at the two crystallographic sites of Ru in the parent compound. Ba4Ru2FeO10 exhibits a spin-glass like transition at 25 K, while Ba4Ru2CoO10 does not show any magnetic order down to 2 K. According to electrical resistivity measurements performed on single crystals both compounds are semiconductors. In contrast to the variable-range hopping of the transport mechanism of Co bearing material, the electrical resistivity of Ba4Ru2FeO10 follows an activation law resulting in a band gap of approximately 0.98 eV. |
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