Synthesis of MgAl2O4 spinel by thermal plasma and its synergetic structural study

Dash, Sanghamitra; Sahoo, Rakesh K.; Das, Arpita; Bajpai, Shubhra; Debasish, Debidutta; Singh, Saroj Kumar

doi:10.1016/j.jallcom.2017.08.085

Cited by 39 publications

(22 citation statements)

References 47 publications

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“…The main Raman band (shift) identified from the Raman spectroscopy measurements for each specified phase used to prepare the samples was compared with previous studies [11][12][13][14][15]. Table 3 shows the Raman shift or band (cm −1 ) for measured samples in this work and the published reference materials.…”

Section: Analysis Of Phase Content Based On Raman Spectramentioning

confidence: 97%

“…Additionally, phases such as Al 2 O 3 , MgO•Al 2 O 3 , C12A7, CA, C3A, and CaS have been measured and demonstrated to be Raman active [11][12][13][14][15]. Furthermore, Raman spectroscopy is found to be applicable in various research fields for quantitative and qualitative analysis [16], including some studies already done on synthetic [17,18] and actual [19] inclusion phase studies.…”

Section: Introductionmentioning

confidence: 95%

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Application of Raman Spectroscopy for Characterizing Synthetic Non-Metallic Inclusions Consisting of Calcium Sulphide and Oxides

et al. 2020

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The presence of non-metallic inclusions (NMI) such as sulphides and oxides may be detrimental to the control of the steel casting process and product quality. The need for their identification and characterization is, therefore, urgent. This study uses time-gated Raman spectroscopy for the characterization of synthetic duplex oxide-sulphide phases that contain CaS and the oxide phases of Al2O3, CA, C12A7, C3A, and MgO·Al2O3 (MA). Binary phase samples of CaS–MA, C3A–CaS, C12A7–CaS, Al2O3–CaS, and MA–CaS were prepared with varying phase contents. The relative intensities of the Raman peaks were used to estimate the samples’ phase content. For a quantitative estimation, linear regression calibration models were used to evaluate the change in phase content in the samples. The most suitable Raman peak ratios had mean absolute error (MAE) values ranging from 3 to 7 wt. % for the external validation error, and coefficients of determination (R2) values between 0.94 and 0.98. This study demonstrated the use of Raman spectroscopy for the characterization of the calcium sulphide, magnesium aluminate spinel, Al2O3, and calcium aluminate phases of CA, C3A, and C12A7 in a duplex oxide-sulphide system, and it offers potential for inclusion characterization in steel.

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Section: Analysis Of Phase Content Based On Raman Spectramentioning

confidence: 97%

Section: Introductionmentioning

confidence: 95%

Application of Raman Spectroscopy for Characterizing Synthetic Non-Metallic Inclusions Consisting of Calcium Sulphide and Oxides

et al. 2020

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“…MgO.Al2O3 416 s, 674 m, 773 m 409 -412 [27][28][29][30][31][32] s, 767 -772 [27][28][29][30][31][32] m, 666 -674 [27][28][29][30][31][32] m, 312-313 [27][28][29][30][31][32] m Figure 7 shows the Raman spectra obtained from samples that contain CA and MA, where it was noticed that when CA content was increased, the Raman spectra showed a rise in the peak intensity in the region of 520-524 cm − 1 . A peak shoulder in the 545-549 cm − 1 region was observed, which is a characteristic feature for the CA phase as the phase content increases.…”

Section: Characterisation and Phase Analysismentioning

confidence: 99%

“…Although previous research work has used Raman spec-troscopy to characterise spinel [27][28][29][30][31][32] and different calcium aluminate oxide phases, [33][34][35][36] the focus has mainly been on the characterisation of specific or individual phases. Additionally, Raman spectroscopy has also been used for characterising specific non-metallic inclusions.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Binary Phase Mixtures of Magnesium-Aluminate Spinel and Calcium-Aluminates Using Time-Gated Raman Spectroscopy

et al. 2020

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The modification of MgO•Al 2 O 3 spinel inclusions into less detrimental mixture phases of CaO-MgO-Al 2 O 3 plays an essential role in refining calcium-treated aluminium killed steels. This study uses Raman spectroscopy for the characterisation of binary phase samples that contain MgO•Al 2 O 3 spinel and calcium aluminate (CaO) x -(Al 2 O 3 ) y phases. Samples were synthesised from MgO•Al 2 O 3 spinel (MA), Al 2 O 3 and calcium aluminate phases to achieve binary samples of CA-MA, C3A-MA, C12A7-MA and Al 2 O 3 -MA with varying phase fractions.The study also examined the possibility of a slight variation for non-stoichiometric spinel samples below the 1 600°C region in an MgO-Al 2 O 3 binary system. The relative intensities of the Raman band were used for the quantification of the phase fractions. For a quantitative prediction, linear regression calibration models were identified for each of the studied systems. This work demonstrates the use of Raman spectroscopy for the characterisation of calcium aluminate phases of CA, C3A, C12A7 and magnesium aluminate spinel phases along with Al 2 O 3 and its potential application in inclusion characterisation.

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“…For normal spinel, like MA, B 3+ cations occupied 1/4 the positions of octahedral and A 2+ cations occupied 1/8 of the tetrahedral positions. There are several methods for synthesizing magnesium aluminate such as hydrothermal, 2 microwaveassisted combustions, 3 Thermal Plasma, 4 and sol-gel. 5 Microwave-assisted combustion method, however, needs a long processing time to acquire pure MA, and the Thermal plasma spray and hydrothermal techniques are expensive and resulted in MA with MgO and Al2O3 impurities.…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF Mg-Al Wt% FOR PHASE FORMATION OF SPINEL MgAl2O4 PRODUCED BY METAL DISSOLVED METHOD

Umamah

Pratapa

Andi

2020

Jurnal Fisika dan Aplikasinya

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Synthesis of magnesium aluminate spinel powder (MgAl2O4, abbreviated as MA) were prepared by the liquid mixing method. The synthesis of MA involved Mg powders with various weight compositions (4.8; 10; 20; 30; 40; and 60%) and Al powders (95.2; 90; 80; 70; 60 and 40%) as the raw materials, which were independently dissolved in 37% HCl to form MgCl2 and AlCl3 solutions. Both solutions were then mixed and stirred for 5 hours and dried to a temperature of about 100-105C to produce powders with different weight compositions. Each powder resulted from drying was characterized using DTA-TGA, and then calcined at 650 C; 750 C and 850 C for 1 hour. The calcined powder was characterized by XRD to qualitative and quantitative analyses using Rietica. It was found that MA samples contained only MgAl2O4 and MgO as the impurity phase. The relative weight fraction of MgAl2O4 increased up to 99% for 95.2 wt% Al. Using an extrapolative approach to determine the Mgto-Al composition, nearly pure MA, as high as 99%, was achieved at 95.2% Al and 4.8% Mg.

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Synthesis of MgAl2O4 spinel by thermal plasma and its synergetic structural study

Cited by 39 publications

References 47 publications

Application of Raman Spectroscopy for Characterizing Synthetic Non-Metallic Inclusions Consisting of Calcium Sulphide and Oxides

Application of Raman Spectroscopy for Characterizing Synthetic Non-Metallic Inclusions Consisting of Calcium Sulphide and Oxides

Characterisation of Binary Phase Mixtures of Magnesium-Aluminate Spinel and Calcium-Aluminates Using Time-Gated Raman Spectroscopy

THE EFFECT OF Mg-Al Wt% FOR PHASE FORMATION OF SPINEL MgAl2O4 PRODUCED BY METAL DISSOLVED METHOD

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