Molten salt synthesis of δ-CaCr 2 O 4 and its annealing to prepare β-CaCr 2 O 4

Liu, Zhengwei; Zhang, Hongling; Luo, Minghui; Li, Pei; Shi, Yi-lang; Cai, Zai-hua; Xu, Hongbin; Zhang, Yi

doi:10.1016/j.ceramint.2016.10.069

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…5b, which is assumed to form from the combination reaction between Cr 2 O 3 and CaO dissolved in CaCl 2 molten salt. 14,31 Moreover, the XRD spectrum of the outer surface of the sintered NiO-Cr 2 O 3 pellet still shows the sintered phases, that is to say, NiO and NiCr 2 O 4 phase without CaCr 2 O 4 phase detected.…”

Section: Electro-reduction Pathways and Microstructural Changes-inmentioning

confidence: 94%

Direct Electrochemical Preparation of Ni-Cr Alloy from Solid Oxides in Molten CaCl₂

Liu

Zhang

et al. 2017

J. Electrochem. Soc.

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Direct electro-reduction of mixed powders of chromium oxide (Cr 2 O 3 ) and nickel oxide (NiO) to the intermetallic compound Cr 1.12 Ni 2.88 was successfully demonstrated in CaCl 2 molten salt at 900 • C. The reduction mechanism was investigated by cyclic voltammetry using a metallic cavity electrode (MCE) as well as the characterizations of some partially electrolyzed products and Ni-Cr alloy prepared from constant voltage electrolysis by terminating the reduction process after different times, which were characterized by means of XRD and SEM et al. It was found that the reduction starts with the formation of Ni metal, accompanied with the formation of an intermediate product CaCr 2 O 4 . Then, the intermediate product CaCr 2 O 4 is further electro-reduced to Cr, which is directly alloyed with the newly-formed Ni to form the Ni-Cr intermetallic compound. At the same time, pure Cr phase could not be detected by the XRD or EDXA when the Cr content is relatively low in the NiO-Cr 2 O 3 mixture. Intermetallic compound with the target stoichiometry containing 6000 ppm oxygen is obtained after 4 h electro-reduction in CaCl 2 molten salt at 900 • C.

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Section: Electro-reduction Pathways and Microstructural Changes-inmentioning

confidence: 94%

Direct Electrochemical Preparation of Ni-Cr Alloy from Solid Oxides in Molten CaCl₂

Liu

Zhang

et al. 2017

J. Electrochem. Soc.

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Thermal expansion of ellinaite (β-CaCr2O4): an in-situ high temperature X-ray diffraction study

Xue

Zhai

2021

Phys Chem Minerals

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Diffusion Characteristics of Intermediate in Cr2O3/CaO System and Its Formation Mechanism

Yue

Xue

Zhang

2021

Metall Mater Trans B

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Molten salt synthesis of δ-CaCr 2 O 4 and its annealing to prepare β-CaCr 2 O 4

Cited by 6 publications

References 15 publications

Direct Electrochemical Preparation of Ni-Cr Alloy from Solid Oxides in Molten CaCl₂

Direct Electrochemical Preparation of Ni-Cr Alloy from Solid Oxides in Molten CaCl₂

Thermal expansion of ellinaite (β-CaCr2O4): an in-situ high temperature X-ray diffraction study

Diffusion Characteristics of Intermediate in Cr2O3/CaO System and Its Formation Mechanism

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Molten salt synthesis of δ-CaCr 2 O 4 and its annealing to prepare β-CaCr 2 O 4

Cited by 6 publications

References 15 publications

Direct Electrochemical Preparation of Ni-Cr Alloy from Solid Oxides in Molten CaCl2

Direct Electrochemical Preparation of Ni-Cr Alloy from Solid Oxides in Molten CaCl2

Thermal expansion of ellinaite (β-CaCr2O4): an in-situ high temperature X-ray diffraction study

Diffusion Characteristics of Intermediate in Cr2O3/CaO System and Its Formation Mechanism

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Resources

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Direct Electrochemical Preparation of Ni-Cr Alloy from Solid Oxides in Molten CaCl₂

Direct Electrochemical Preparation of Ni-Cr Alloy from Solid Oxides in Molten CaCl₂