以分析纯Bi(NO3)3·5H2O和Y(NO3)·6H2O为原料制备纳米β-Bi2O3和Bi2O3-Y2O3(75%(摩尔分数)Bi2O3+25%(摩尔分数)Y2O3)粉体,平均粒度分别为40和30nm.经TG-DTA、高温XRD以及高温拉曼的研究结果表明,亚稳态的纳米β-Bi2O3粉体在升温过程中于420℃先向低温稳定的α-Bi2O3转变,在720℃时向δ-Bi2O3相转变,降温过程则是由δ→β→α.由于纳米Bi2O3具有很高的活性,使得相变温度比微米Bi2O3有所降低.纳米Bi2O3-Y2O3复合粉体升温过程中,Y2O3的固溶反应在较低温度(400℃)开始,500℃时β-Bi2O3完全转变为δ相,同时Y2O3完全固溶到δ-Bi2O3晶体中.Y2O3的掺杂使得Bi2O3的β→δ相转变温度大幅降低.
参考文献
| [1] | Marschman Steven C;Lumvj D C .[J].Canadian Journal of Chemical Engineering,1984,62(06):875-879. |
| [2] | Birgit B;Martin J .[J].Journal of the Less-Common Metals,1989,156:123-135. |
| [3] | Medernach John W;Snyder Robert L .[J].Journal of the American Ceramic Society,1978,61(11-22):494-4971. |
| [4] | Takahashi T;Iwahara H;Nagai Y .[J].Journal of Applied Electrochemistry,1972,2:97-104. |
| [5] | Takahashi T;Iwahara H;Arao T.[J].Journal of Applied Electrochemistry,1972(05):187-195. |
| [6] | Sammes N M;Tompsett G A;N(a)fe H et al.[J].Journal of the European Ceramic Society,1999,19:1801-1826. |
| [7] | Gattow G;Schroder H .[J].Zeitschrift fur Anorganische und Allgemeine Chemie,1962,318:176-189. |
| [8] | Gattow G;Schutze D .[J].Zeitschrift fur Anorganische und Allgemeine Chemie,1964,328:44-68. |
| [9] | Harwig H A;Gerards A G .[J].Thermochimica Acta,1979,28:121-131. |
| [10] | Schumb W C;Rittner E S .[J].Journal of the American Chemical Society,1943,65:1055-1060. |
| [11] | Harwig H A;Gerards A G .[J].Journal of Solid State Chemistry,1978,26:265-374. |
| [12] | Karch J;Birringer R;Gleiter H .[J].NATURE,1987,330:556. |
| [13] | Ferrari A.Development,Industrialization of Nanocomposite Ceramic Material[A].Atlanta Airport Marriott,1995 |
| [14] | 何伟明,甄强,潘庆谊,刘建强.Bi2O3-Y2O3体系中纳米δ-Bi2O3相的生成规律研究[J].功能材料,2004(06):727-729. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%