Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/14959
ชื่อเรื่อง: ESR study of spin-Hamiltonian parameters and crystal field energy levels for the low C3 symmetry Fe3+ center in green sapphire crystals and powder
ผู้แต่ง: Limsuwan P.
Udomkan N.
Winotai P.
วันที่เผยแพร่: 2007
บทคัดย่อ: In this report, Fe3+ impurity ions present in green sapphire (Al3O3) were studied experimentally, by heating a light green sapphire in flowing oxygen atmosphere for 12 h from 1200, 1300, 1400, 1500 and 1600°C, respectively. Electron spin resonance (ESR) spectra in X-band (∼9.45 GHz) were recorded by mounting the crystal with the c-axis perpendicular (θ = 90°) to the magnetic field direction. The spectra were recorded and simulated by a numerical diagonalization of spin Hamiltonian matrix in the range from 0 to 180 degrees for every 15 degrees of rotation angle (φ). In our case, only the last two sets of peaks strongly depend on the rotation angle (φ), and each exhibits C3 symmetry due to two magnetically inequivalent Fe3+ sites in the corundum structure. For polycrystalline ESR spectra, seven main Fe3+ ESR absorption peaks occur at the resonance magnetic fields of 100.20, 310.24, 486.80, 525.00, 550.60, 761.00 and 777.00 mT respectively. Specifically, ESR signals show that the number of paramagnetic Fe3+ ions increase roughly linearly with the heat treating temperature, having the Fe3+/FeRT 3+ ratio ∼1.41 at 1600°C. © World Scientific Publishing Company.
URI: https://ir.swu.ac.th/jspui/handle/123456789/14959
https://www.scopus.com/inward/record.uri?eid=2-s2.0-33947121332&doi=10.1142%2fS0217984907012505&partnerID=40&md5=8d2c17d788c7550eaac4be67ff51c2fd
ISSN: 2179849
Appears in Collections:Scopus 1983-2021

Files in This Item:
There are no files associated with this item.


Items in SWU repository are protected by copyright, with all rights reserved, unless otherwise indicated.