Preparation of R2S3 (R: La, Pr, Nd, Sm) powders by sulfurization of oxide powders using CS2 gas
Preparation of R2S3 (R: La, Pr, Nd, Sm) powders by sulfurization of oxide powders using CS2 gas
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DOI：
10.1016/j.jallcom.2003.11.081
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发表时间：
2004-07
影响因子：
6.2
通讯作者：
M. Ohta;Hai-bin Yuan;S. Hirai;Y. Uemura;K. Shimakage
中科院分区：
文献类型：
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作者：
M. Ohta;Hai-bin Yuan;S. Hirai;Y. Uemura;K. Shimakage
CS2气体硫化La 2 O3粉末合成La 2S 3时，反应初期生成La 2 O2 S，在较高温度下，反应时间较短，最终生成单相β-La 2S 3。当硫化时间为8h时，在1023 K以上即可合成单相β-La 2S 3。在用CS2气体硫化Pr 6 O 11粉末合成Pr 2S 3的过程中，作为中间产物生成PrS1.7、Pr 4 O 7和Pr 2 O2 S。当硫化温度高于1123 K时，反应初期只生成Pr 2 O2 S，而在较高温度下，在较短时间内生成含有微量β-Pr 2S 3的α-Pr 2S 3，而不是Pr 2 O2 S。在用CS2气体硫化Nd 2 O3和Sm 2 O3粉末合成Nd 2S 3和Sm 2S 3的过程中，在反应初期也只生成Nd 2 O2 S和Sm 2 O2 S。在1073和1123 K以上，α-Nd_2S_3和β-Nd_2S_3相的形成时间较短，α-Sm_2S_3相的形成时间较短。在所有情况下，合成粉末中的杂质氧含量随着硫化温度的升高而逐渐降低。随着硫化温度的升高，粉末中的碳含量逐渐增加。
In the synthesis of La2S3via the sulfurization of La2O3powder using CS2gas, La2O2S was formed in the initial stage of reaction, and single-phase β-La2S3were finally formed for a shorter period of time at higher temperature. For long sulfurization time of 8h, single-phase β-La2S3could be synthesized at above 1023K. In the synthesis of Pr2S3via the sulfurization of Pr6O11powder using CS2gas, PrS1.7, Pr4O7, and Pr2O2S were formed as intermediate products. At sulfurization temperatures above 1123K, only Pr2O2S was formed in the initial stage of reaction, and α-Pr2S3having a trace of β-Pr2S3was formed for a shorter period of time at higher temperature instead of Pr2O2S. In the synthesis of Nd2S3and Sm2S3via the sulfurization of Nd2O3and Sm2O3powders using CS2gas, only Nd2O2S and Sm2O2S were also formed in the initial stage of reaction. And α-Nd2S3having a trace of β-Nd2S3and single phase α-Sm2S3were formed for a shorter period of time at above 1073 and 1123K, respectively. In all cases, the impurity oxygen content in synthetic powders decreased gradually with an increase in sulfurization temperature. Moreover, the carbon content in these powders increased gradually with an increase in the sulfurization temperature.