固相反應合成鈣鈦礦型氧化物Ba1.0Co0.7Fe0.2Nb0.1O3-δ的機理

李春宏; 仇衛華; 李敬; 康曉麗; 魯雄剛; 李福燊

doi:10.13374/j.issn1001-053x.2009.01.015

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固相反應合成鈣鈦礦型氧化物Ba_1.0Co_0.7Fe_0.2Nb_0.1O_3-δ的機理

doi: 10.13374/j.issn1001-053x.2009.01.015

1. 北京科技大學材料科學與工程學院, 北京 100083;
2. 上海大學材料科學與工程學院, 上海 200072

基金項目:

國家高技術研究發展計劃資助項目（No.2006AA11A189）

詳細信息

作者簡介:
李春宏(1984-),男,碩士研究生;仇衛華(1950-),女,副教授,E-mail:qiuwh@vip.sina.com

中圖分類號: TQ174.7
計量
- 文章訪問數: 137
- HTML全文瀏覽量: 32
- PDF下載量: 4
- 被引次數: 0
出版歷程
- 收稿日期: 2007-12-18
- 網絡出版日期: 2021-08-09

Synthetical process of perovskite-type oxide Ba_1.0Co_0.7Fe_0.2Nb_0.1O_3-δ by solid state reaction

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

摘要

摘要: 以BaCO₃、Co₃O₄、Fe₂O₃和Nb₂O₅粉末為原料,通過固相反應合成了鈣鈦礦型復合氧化物Ba_1.0Co_0.7Fe_0.2Nb_0.1O_3-δ.利用XRD、SEM和TGA-DSC同步熱分析儀等研究了合成該材料的反應過程.結果發現,在固相反應法合成Ba_1.0Co_0.7Fe_0.2-Nb_0.1O_3-δ的過程中,首先出現的是BaCoO₃、BaFeO_2.9相和Ba₅Nb₄O₁₅相,在1 473 K燒結10 h能夠得到立方鈣鈦礦相的Ba_1.0-Co_0.7Fe_0.2Nb_0.1O_3-δ.通過分析,整個反應過程分為兩個階段:第一階段為BaCO₃和Co₃O₄、Fe₂O₃、Nb₂O₅之間的加成反應;第二階段為加成反應生成的BaCoO₃、BaFeO_2.9和Ba₅Nb₄O₁₅三相之間逐漸固溶生成均相Ba_1.0Co_0.7Fe_0.2Nb_0.1O_3-δ,此過程伴隨有氧的脫出.
- 鈣鈦礦型氧化物 /
- 固相反應 /
- 成相過程 /
- 透氧膜材料
Abstract: A perovskite-type composite oxide Ba_1.0Co_0.7Fe_0.2Nb_0.1O_3-δ(BCFN) was successfully synthesized by solid state reaction with BaCO₃, Co₃O₄, Fe₂O₃ and Nb₂O₅ powders as raw materials. The synthetical process and morphology of BCFN fine particles were studied by non-isothermal thermogravimetry and differential scanning calorimetry (DSC), X-ray diffraction analysis, and scanning electron microscope. The results show that during the synthesis process, BaCO₃、BaFeO_2.9 and BasNb₄O₁₅ phases firstly appeared, and after 10 h sintering at 1473 K, a cubic perovskite-type oxide Ba_1.0Co_0.7Fe_0.2Nb_0.1O_3-δ was synthesized. The overall reaction process is considered involving two stages. The first stage is addition reaction between BaCO₃ and CO₃O₄, Fe₂O₃, Nb₂O₅ particles and the second is solid solution reaction between BaCoO₃ and BaFeO_2.9, Ba₅Nb₄O₁₅ phases formed in the first stage. Oxygen escaping was observed during the second stage.
- perovskite-type oxides /
- solid state reaction /
- synthetical process /
- oxygen permeable materials