Molten salt synthesis of δ-CaCr₂O₄ and its annealing to prepare β-CaCr₂O₄

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• 作者：Zheng-wei Liu^a ; ^b ; ^c ; Hong-ling Zhang^a ; ^b ; ^{hlzhang@ipe.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Min-ting Luo^a ; ^b ; Li-li Pei^a ; ^b ; Yi-lang Shi^d ; Zai-hua Cai^d ; Hong-bin Xu^a ; ^b ; Yi Zhang^a ; ^b
• 关键词：CaCr2O4 ; Platelet ; Magnetic properties ; Molten salt
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1231-1235
• 全文大小：1212 K

文摘

Molten salt synthesis (MSS), due to the high reactivity of salts, small diffusion distance and high mobility of species in molten salt, can not only reduce the synthesis temperature but also shorten the reaction time. Herein, MSS method was employed to synthesize δ-CaCr₂O₄ powder by using CaO, Cr₂O₃ as raw materials and CaCl₂ which has a high solubility of CaO as molten salt. The influence of reaction time was investigated and δ-CaCr₂O₄ with platelet morphology was obtained after reaction for 2 h at 900 °C. Pure rod-like β-CaCr₂O₄ was further prepared by simply annealing the as-synthesized δ-CaCr₂O₄ in argon atmosphere for 3 h at 1100 °C. The magnetization and its corresponding reciprocal susceptibility of δ-CaCr₂O₄ and β-CaCr₂O₄ samples was also measured and calculated, which indicated a paramagnetic arrangement and an antiferromagnetic arrangement during the test temperature range 2–250 K, respectively.