STUDIES ON HYDROLYZABLE CARBIDES .22. THE CARBOTHERMAL REDUCTION OF SCANDIUM OXIDE SC2O3
STUDIES ON HYDROLYZABLE CARBIDES .22. THE CARBOTHERMAL REDUCTION OF SCANDIUM OXIDE SC2O3
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DOI：
10.1007/bf00810872
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发表时间：
1986-11-01
影响因子：
1.8
通讯作者：
BROZEK, V
中科院分区：
文献类型：
--
作者：
HAJEK, B;KAREN, P;BROZEK, V
[en]用X射线衍射、化学分析和水解法研究了氧化钪碳热还原产物的组成。在10-2-1 Pa的压力下，反应在1000-1200 o C的温度范围内开始。第一种产物是NaCl型的Sc 2 OC，在1 Pa和1400-1500 o C下，该物质在50-100 h内定量生成（根据化学计量），但必须反复均化，否则Sc 2 OC与Sc 2 O 3局部反应生成Sc 2 O 1+ x C 1-x。Sc 15 C19存在时，Sc2 OC的晶格常数为457.63 μ m.在1500 ° C以上的温度下，Sc 15 C 19通过随后与碳反应而不完全形成.产品在cca下熔化。1800 ° C;碳溶解，最终成分接近ScC 2。碳在凝固过程中分离。产物中的相分离受蒸发的影响，高于Sc 2 OC和Sc 15 C 19的蒸气压与碳还原过程所需的压力相当。结果进行了讨论，相对于经常模棱两可的公布的数据。（作者）
[en] The composition of the products of carbothermal reduction of Sc 2 O 3 is examined by X-ray diffraction and chemical analysis and by the hydrolysis method. At pressures of 10-2-1 Pa, the reaction starts in the temperature region of 1000-1200 o C. The first product is Sc 2 OC of NaCl type; at 1 Pa and 1400-1500 o C this substance is formed quantitatively (according to stoichiometry) within 50-100 h, repeated homogenization, however, is necessary, or else Sc 2 OC reacts locally with Sc 2 O 3 giving Sc 2 O 1+ x C 1-x. The lattice parameter of Sc 2 OC in the presence of Sc 15 C 19 is 457.6 3 pm. At temperatures above 1500 o C, Sc 15 C 19 is incompletely formed by subsequent reaction with carbon. The product melts at cca. 1800 o C; carbon dissolves and the final composition approaches ScC 2. Carbon separates during solidification. The phase fractionsin the products are affected by evaporation, the vapour pressures above both Sc 2 OC and Sc 15 C 19 being comparable with the pressure requisite for the carboreduction process. The results are discussed with respect to the often ambiguous published data.(Author)