Synthesis and characterisation of the vibrational and electrical properties of antiferromagnetic 6L-Ba2CoTeO6 ceramics
Optimal processing conditions for fabrication of dense single-phase 6L-Ba2CoTeO6 ceramics via the solid-state reaction method were determined. These ceramics possess a room-temperature crystal structure described by the centrosymmetric P3m1 space group. Polarized Raman spectroscopy enabled the obser...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Royal Society of Chemistry
2019
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| Subjects: | |
| Online Access: | View Fulltext in Publisher View in Scopus |
| LEADER | 03215nam a2200589Ia 4500 | ||
|---|---|---|---|
| 001 | 10.1039-c9dt00418a | ||
| 008 | 220121s2019 CNT 000 0 und d | ||
| 020 | |a 14779226 (ISSN) | ||
| 245 | 1 | 0 | |a Synthesis and characterisation of the vibrational and electrical properties of antiferromagnetic 6L-Ba2CoTeO6 ceramics |
| 260 | 0 | |b Royal Society of Chemistry |c 2019 | |
| 650 | 0 | 4 | |a Ac impedance spectroscopy |
| 650 | 0 | 4 | |a Activation energy |
| 650 | 0 | 4 | |a Antiferromagnetic phase transition |
| 650 | 0 | 4 | |a Antiferromagnetic transition |
| 650 | 0 | 4 | |a Antiferromagnetics |
| 650 | 0 | 4 | |a Antiferromagnetism |
| 650 | 0 | 4 | |a article |
| 650 | 0 | 4 | |a Ceramic materials |
| 650 | 0 | 4 | |a ceramics |
| 650 | 0 | 4 | |a Cobalt compounds |
| 650 | 0 | 4 | |a cooling |
| 650 | 0 | 4 | |a crystal structure |
| 650 | 0 | 4 | |a Crystal structure |
| 650 | 0 | 4 | |a Fourier transform infra reds |
| 650 | 0 | 4 | |a Fourier transformation |
| 650 | 0 | 4 | |a impedance spectroscopy |
| 650 | 0 | 4 | |a infrared radiation |
| 650 | 0 | 4 | |a low temperature |
| 650 | 0 | 4 | |a oxidation |
| 650 | 0 | 4 | |a phase transition |
| 650 | 0 | 4 | |a Polarized raman spectroscopy |
| 650 | 0 | 4 | |a Raman spectrometry |
| 650 | 0 | 4 | |a room temperature |
| 650 | 0 | 4 | |a Single crystals |
| 650 | 0 | 4 | |a Single-crystal study |
| 650 | 0 | 4 | |a solid state |
| 650 | 0 | 4 | |a Solid state reaction method |
| 650 | 0 | 4 | |a Solid state reactions |
| 650 | 0 | 4 | |a synthesis |
| 650 | 0 | 4 | |a Temperature |
| 856 | |z View Fulltext in Publisher |u https://doi.org/10.1039/c9dt00418a | ||
| 856 | |z View in Scopus |u https://www.scopus.com/inward/record.uri?eid=2-s2.0-85069796511&doi=10.1039%2fc9dt00418a&partnerID=40&md5=f8d68b84565abe6da9f7c9c08f9ae7ab | ||
| 520 | 3 | |a Optimal processing conditions for fabrication of dense single-phase 6L-Ba2CoTeO6 ceramics via the solid-state reaction method were determined. These ceramics possess a room-temperature crystal structure described by the centrosymmetric P3m1 space group. Polarized Raman spectroscopy enabled the observation of all the 25 predicted Raman modes and assignment of their symmetries. On cooling, BCTO ceramics exhibit two antiferromagnetic transitions at 3 K and 12.5 K, in broad agreement with a recent single-crystal study [P. Chanlert, N. Kurita, H. Tanaka, D. Goto, A. Matsuo and K. Kindo, Phys. Rev. B: Condens. Matter Mater. Phys., 2016, 93, 094420]. Low temperature Fourier-transform infrared reflectivity analyses suggest the antiferromagnetic phase transitions to be driven by small distortions of the CoO6 octahedra, lowering locally their C3v symmetry. This causes splitting of the associated vibrational modes, but without a long-range structural change. AC impedance spectroscopy revealed BCTO ceramics to be leaky insulators with an activation energy for conduction of ∼0.15-0.25 eV, which suggests electron hopping between mixed oxidation states of Co. © The Royal Society of Chemistry 2019. | |
| 700 | 1 | 0 | |a Aziz, A.A. |e author |
| 700 | 1 | 0 | |a Bell, A.M.T. |e author |
| 700 | 1 | 0 | |a Dias, A. |e author |
| 700 | 1 | 0 | |a Eccleston, R. |e author |
| 700 | 1 | 0 | |a Feteira, A. |e author |
| 700 | 1 | 0 | |a Lobo, R.P.S.M. |e author |
| 700 | 1 | 0 | |a Mercone, S. |e author |
| 700 | 1 | 0 | |a Moreira, R.L. |e author |
| 773 | |t Dalton Transactions |x 14779226 (ISSN) |g 48 29, 11112-11121 | ||