Studies on Thermophysical Properties of CaO and MgO by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi mathvariant="bold-italic">γ</mml:mi></mml:mrow></mml:math>-Ray Attenuation

Rao, A. S. Madhusudhan; Narender, K.

doi:10.1155/2014/123478

Cited by 33 publications

(3 citation statements)

References 28 publications

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“…In contrast to the fused spinel (SP AM 70), PAK expanded much more during heating, which is typical for Cr-containing spinels. Notably, FeCr 2 O 4 is characterized by a high thermal expansion coefficient of 12.38 × 10 −6 1/K (close to the thermal expansion coefficient of MgO) when compared to the thermal expansion coefficient of spinel sensu stricto of 8.83 × 10 −6 1/K (all coefficients were given for temperature range 20-1200 • C) [62]. None of the test mixtures started to flow when reaching the limit temperature of the test of 1500 • C.…”

Section: Hot-stage Microscopy Test Of Cu Slagmentioning

confidence: 97%

“…The presented curves (Figure 4) show the expansion for all test raw materials. The most significant linear expansion of 4% was observed for the mixture of FMC 57 + slag at about 950 • C. This resulted from the highest level of MgO, which possesses a high thermal expansion coefficient (α MgO = 15.60 × 10 −6 1/K [62]). FMC 45 + slag reached a maximum expansion of about 3% at 1100 • C; for PAK, the maximum expansion was registered at 800 • C as 2.5%.…”

Section: The Phase Composition Of Raw Materials By Xrdmentioning

confidence: 97%

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Corrosion Resistance of MgO and Cr2O3-Based Refractory Raw Materials to PbO-Rich Cu Slag Determined by Hot-Stage Microscopy and Pellet Corrosion Test

et al. 2022

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Chemical resistance of commercial refractory raw materials against Cu slag is critical to consider them as candidates for the production of refractories used in Cu metallurgy. In this study, we show the comparative results for the corrosion resistance of four commercial refractory raw materials—magnesia chromite co-clinkers FMC 45 and FMC 57, PAK, and fused spinel SP AM 70—against aggressive, low-melting PbO-rich Cu slag (Z1) determined by hot-stage microscopy (up to 1450 °C) and pellet test (1100 and 1400 °C). Samples were characterized after the pellet test by XRD, SEM/EDS, and examination of their physicochemical properties to explore the corrosion reactions and then assess comparatively their chemical resistance. Since many works have focused on corrosion resistance of refractory products, the individual refractory raw materials have not been investigated so far. In this work, we show that magnesia chromite co-clinker FMC 45 exhibits the most beneficial properties considering its application in the production of refractories for the Cu industry. Forsterite (Mg2SiO4) and güggenite (Cu2MgO3) solid solutions constitute corrosion products in FMC 45, and its mixture with slag shows moderate dimensional stability at high temperatures. On the other hand, the fused spinel SP AM 70 is the least resistant to PbO-rich Cu slag (Z1); it starts to sinter at 970 °C, followed by a fast 8%-shrinkage caused by the formation of güggenite solid solution in significant amounts.

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Section: Hot-stage Microscopy Test Of Cu Slagmentioning

confidence: 97%

Section: The Phase Composition Of Raw Materials By Xrdmentioning

confidence: 97%

Corrosion Resistance of MgO and Cr2O3-Based Refractory Raw Materials to PbO-Rich Cu Slag Determined by Hot-Stage Microscopy and Pellet Corrosion Test

et al. 2022

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“…To study thermo physical properties at high temperatures, the technique of attenuation of gamma rays is very well established and has an advantage when compared to other methods because there is no thermal contact of gamma radiation with sample which minimizes the heat losses and facilitates sample and probe compatibility. Using gamma ray densitometer, thermal expansion of a large number of materials has been studied in our laboratory [13][14][15][16][17][18][19]. Recently we reported thermal expansion of samarium oxide from attenuation measurements of gamma rays in the range 300 to 1000 K [20].…”

Section: Introductionmentioning

confidence: 99%

Thermal expansion of lanthanum and neodymium oxides from 300–1000 K from measurements of attenuation of gamma rays

Rao¹,

Krishna²,

Lingam³

2021

Phys. Scr.

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The present communication is a study of the linear attenuation coefficients, density and thermal expansion of oxides of lanthanum and neodymium as a function of temperature from 300–1000 K. The values of thermal expansion have been determined from linear attenuation coefficient of gamma rays and density in the range 300–1000 K. Measurements on the attenuation of gamma rays have been made with an experimental set up assembled in our laboratory using narrow beam geometry method. Radioactive gamma source 137Cs (0.662 MeV) has been used for making measurements. The results on the linear gamma ray attenuation (μ l), density (ρ) and the coefficient of linear thermal expansion (α) of Lanthanum oxide (La2O3)and Neodymium oxide (Nd2O3) as a function of temperature have been fit to a second degree polynomial equation. The linear attenuation coefficient (μ l) of La2O3 shows a decrease from 50.87 m−1 at 350 K to 49.96 m−1 at 1000 K. The linear attenuation coefficient (μ l) of Nd2O3 shows a decrease from 59.04 m−1 at 350 K to 58.07 m−1 at 1000 K. The decrease in density for lanthanum and neodymium oxides from 350–1000 K is 1.79% and 1.64% respectively. The present results on the thermal expansion of La2O3 and Nd2O3 have been compared with the results obtained from x-ray diffraction method.

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Texture and interface characterization of iridium thin films grown on MgO substrates with different orientations

et al. 2019

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Iridium thin films are grown by direct-current plasma magnetron sputtering, on MgO single crystal substrates with various surface orientation, i.e. (100), (111) and (110). The surface morphology, the crystalline properties of the films, and the substrate-thin film interface, are investigated by atomic force microscopy (AFM), X-ray diffraction (XRD), focused ion beam scanning electron microscopy (FIB-SEM), and high-resolution transmission electron microscopy (HR-TEM), respectively. The results reveal that hetero-epitaxial thin films with different crystallographic orientation and notable atomic scale smooth surface are obtained. From the XRD analysis the following epitaxial relations are obtained: i) (100) Ir || (100) MgO out-of-plane and [001] Ir || [001] MgO in-plane for Ir grown on MgO(100), ii) (110) Ir || (110) MgO out-of-plane and [1-10] Ir || [1-10] MgO in-plane for Ir grown on MgO(110) and iii) (111) Ir || (111) MgO out-of-plane and two variants for in-plane orientation [1-10] Ir || [1-10] MgO and [1-10] Ir || [10-1] MgO , respectively for Ir grown on MgO(111). Because of the large misfit strain (9.7%), the thin films are found to grow in a strain-relaxed state with the formation of geometrical misfit dislocations with a ~2.8 nm spacing, whereas thermal strain is stored upon cooling down from the growth temperature (600 °C). The best structural characteristics are obtained for the (111) oriented films with a mosaicity of 0.3° and vanishingly small lattice distortions. The (100)-and (110)-oriented films exhibit mosaicities of ̴ 1.2° and lattice distortions of ̴ 1% which can be explained by the larger surface energy of these planes as compared to (111).

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Studies on Thermophysical Properties of CaO and MgO by γ-Ray Attenuation

Cited by 33 publications

References 28 publications

Corrosion Resistance of MgO and Cr2O3-Based Refractory Raw Materials to PbO-Rich Cu Slag Determined by Hot-Stage Microscopy and Pellet Corrosion Test

Corrosion Resistance of MgO and Cr2O3-Based Refractory Raw Materials to PbO-Rich Cu Slag Determined by Hot-Stage Microscopy and Pellet Corrosion Test

Thermal expansion of lanthanum and neodymium oxides from 300–1000 K from measurements of attenuation of gamma rays

Texture and interface characterization of iridium thin films grown on MgO substrates with different orientations

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