Magnesium Oxide (MgO)

Roessler, David M.

doi:10.1016/b978-012544415-6.50088-1

Cited by 6 publications

(2 citation statements)

References 67 publications

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“…The absorption coefficient of M:Y (0.06 cm −1 ) at 4.85 μm in Table is higher than those of its constituents. The absorption coefficient of MgO (0.021 cm −1 ) matches the interpolated value in Palik's Handbook of Optical Constants of Solids . The measured absorption coefficient of Y 2 O 3 (0.025 cm −1 ) is eight times greater than the interpolated value of 0.0032 cm −1 from Palik .…”

Section: Resultssupporting

confidence: 62%

Properties of an Infrared‐Transparent MgO:Y₂O₃ Nanocomposite

et al. 2013

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A 50:50 vol% MgO-Y 2 O 3 nanocomposite with~150 nm grain size was prepared in an attempt to make 3-5 lm infraredtransmitting windows with increased durability and thermal shock resistance. Flexure strength of the composite at 21°C is 679 MPa for 0.88 cm 2 under load. Hardness is consistent with that of the constituents with similar grain size. For 3-mm-thick material at 4.85 lm, the total scatter loss is 1.5%, forward scatter is 0.2%, and absorptance is 1.8%. Optical scatter below 2 lm is 100%. Variable intensity OH absorption (~6% absorptance) is observed near 3 lm. The refractive index is 0.4% below the volume-fraction-weighted average of those of the constituents. Thermal expansion is equal to the volumefraction-weighted average of expansion of the constituents. Specific heat capacity is equal to the mass-fraction-weighted average of heat capacities of the constituents. Thermal conductivity lies between those of the constituents up to 1200 K. Elastic constants lie between those of the constituents. The Hasselman mild thermal shock resistance parameter for the composite is twice as great as that of common 3-5 lm window materials, but half as great as that of c-plane sapphire.

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Section: Resultssupporting

confidence: 62%

Properties of an Infrared‐Transparent MgO:Y₂O₃ Nanocomposite

et al. 2013

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“…For the thin film from [42], the parameterization was performed employing a transversal optical-longitudinal optical (TO-LO) phonon model, which provides certain freedom to treat the longitudinal resonance [50][51][52]. For the single crystal, we used a two-Lorentz approach as described in [53,54], which consists of a dominant Lorentz oscillator at 49.1 meV and a small one (nearly 1000:1 in oscillator strengths) at 79.7 meV. To fit our experimental results, the DF of MgO was simulated by reducing the oscillator strength and increasing the broadening of the main Lorentzian peak at ∼49 meV of the single-crystal parameterized DF.…”

Section: The Role Of Mgo In the Spectral Responsementioning

confidence: 99%

Mid-infrared optical properties of non-magnetic-metal/CoFeB/MgO heterostructures

Flores-Camacho

Rana

Balderas‐Navarro

et al. 2023

J. Phys. D: Appl. Phys.

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We report on the optical characterization of non-magnetic metal/ferromagnetic (Co20Fe60B20)/MgOheterostructures and interfaces by using mid infrared spectroscopic ellipsometry at roomtemperature. We extracted for the mid-infrared range the dielectric function of Co20Fe60B20, thatis lacking in literature, from a multisample analysis.From the optical modeling of the heterostructures we detected and determined the dielectric tensor properties of a two-dimensionalelectron gas (2DEG) forming at the non-magnetic metal and the CoFeB interface.These properties comprise independent Drude parameters for the in-plane and out-of plane tensor components, with the latterhaving an epsilon-near-zero frequency within our working spectral range. A feature assigned to spin-orbit coupling (SOC) is identified.Furthermore, it is found that both, the interfacial properties, 2DEG Drude parameters and SOC strength,and the apparent dielectric function of the MgO layer depend on the type of the underlying nonmagnetic metal,namely, Pt, W, or Cu.The results reported here should be useful in tailoring novel phenomena in such types of heterostructures by assessing their optical response noninvasively, complementing existing characterization tools such as angle-resolved photoemission spectroscopy, and those related to electron/spin transport.

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