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Structural and Magnetic Studies of Ga-doped Yttrium iron Garnet

Journal of Wuhan University of Technology(Materials Science) 2021年第1期36卷 13-21页

作者： Khozima Hamasha qassem i mohaidat Mahdi Lataifeh ibrahim Bsoul Sami H Mahmood Department of Basic Sciences Al-Huson University CollegeAl-Balqa Applied UniversityAl-SaltJordan Physics Department Yarmouk UniversityIrbid 21163Jordan Physics Department Al al-Bayt UniversityMafraq 13040Jordan Physics Department The University of JordanAmman 11942Jordan

Ga-doped Yttrium iron Garnet (Y_(3)Ga_(x)Fe_(5-x)O_(12),Ga:YiG) was prepared by solid state reaction method and sintering at 1 300 ℃.Rietveld analysis of X-ray diffraction patterns indicated that all samples crystallized in a single cubic structure (space group ia-3d) with decreasing lattice constant as Ga concentration *** surface micrograph images of YiG samples showed highly compacted grains with small reduction in the grain size with increasing Ga *** spectroscopy measurements confirmed the replacement of Fe^(3+) ions by Ga^(3+) ions in the garnet structure was revealed by the observed blue shifts in Raman *** saturation magnetization decreased from 28.2 to 4.98 emu g^(-1) with increasing x from 0.0 to 1.0 due to the preferential substitution of Ga^(3+) ions for Fe^(3+) ions at tetrahedral *** temperature Mössbauer spectra for the samples revealed a reduction of the hyperfine field values for octahedral and tetrahedral sites,and the development of additional components with increasing Ga *** of the magnetic data and Mössbauer spectra confirmed that spin canting in the substituted garnets plays an important role in explaining the observed reduction of the saturation magnetization as x increased.

关键词： rare earth iron garnet structural characteristics scanning electron microscope raman spectroscopy magnetic properties mössbauer spectroscopy

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Structural, M?ssbauer spectroscopy, magnetic properties, and thermal measurements of Y(3-x)Dy_x Fe_5O_(12)

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Chinese Physics B 2018年第10期27卷 558-564页

作者： Mahdi Lataifeh qassem i mohaidat Sami H Mahmood ibrahim Bsoul Mufeed Awawdeh ibrahim Abu-Aljarayesh Mu'ath Altheeba Physics Department Yarmouk University Irbid 21163 Jordan Physics Department The University of Jordan Amman 11942 Jordan Physics Department AI al-Bayt University Mafraq 13040 Jordan

Yttrium iron garnet powder samples（Y3-xDyxFe5O12）, where part of yttrium ions are substituted by dysprosium ions with different concentrations are prepared by the solid state reaction method. The properties of the prepared samples are examined by different methods such as x-ray diffraction（XRD）, Mssbauer spectroscopy, macroscopic magnetization measurements, and thermal measurements. The XRD measurements show that all the samples reveal the presence of a single garnet phase with a BCC structure. Room temperature Mssbauer spectra indicate that iron ions occupy three magnetic sites, i.e., two octahedral sites and one tetrahedral site. The saturation magnetization and the initial magnetic susceptibility decrease with the increase of Dy^3＋ substitution. The Curie temperature obtained from the thermal measurements seems to be independent of Dy^3＋ substitution.

关键词： Mossbauer spectroscopy magnetic properties x-ray diffraction differential scanning calorimetry

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