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发明授权
CN104651937B 磁制冷材料CaFe0.7Co0.3O3单晶及其制备方法 有权

磁制冷材料CaFe0.7Co0.3O3单晶及其制备方法
摘要：
本发明提出了一种磁制冷材料，其化学式为CaFe0.7Co0.3O3。以及一种制备所述的磁制冷材料的方法，包括：CaCO3、Fe2O3、Co3O4均匀混合后研磨；第一次烧结；将第一次烧结的产物研磨后压制成棒状；第二次烧结得到CaFe0.7Co0.3O2.5多晶棒；以所述CaFe0.7Co0.3O2.5多晶棒为料棒，通过光学浮区法生长CaFe0.7Co0.3O2.5单晶；CaFe0.7Co0.3O2.5单晶同氧源高温高压反应。本发明提出的CaFe0.7Co0.3O3单晶具有优良的磁热效应，工作温区较宽，制冷能力大，不含贵金属元素、适用于高效率的磁制冷装置。
摘要（英）：

The invention provides a magnetic refrigeration material which has a chemical formula of CaFe0.7Co0.3O3. The invention also provides a method for preparing the magnetic refrigeration material. The method comprises the following steps: uniformly mixing CaCO3, Fe2O3 and Co3O4 and grinding; sintering for the first time; grinding the product obtained by sintering at the first time, and pressing the ground product into a rod shape; sintering for the second time, thereby obtaining a CaFe0.7Co0.3O2.5 polycrystalline rod; and by taking the CaFe0.7Co0.3O2.5 polycrystalline rod as a charging bar, growing the CaFe0.7Co0.3O2.5 single crystal by virtue of an optical floating-zone method, wherein a high-temperature high-pressure reaction is carried out between the CaFe0.7Co0.3O2.5 single crystal and an oxygen source. The CaFe0.7Co0.3O3 single crystal provided by the invention has an excellent magnetocaloric effect, is wide in working temperature range and high in refrigerating capacity, does not contain precious metal elements and is suitable for a high-efficiency magnetic refrigeration device.

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