La传感器及碳饱和铁液中La活度测定的研究

金属学报

1995, Vol. 31

Issue (17): 195-199

论文

本期目录 | 过刊浏览

La传感器及碳饱和铁液中La活度测定的研究

邹开云;王常珍;赵乃仁

东北大学

LANTHANUM SENSOR AND ACTIVITY OF LANTHANUM IN CARBON SATURATED IRON

ZOU Kaiyun; WANG Changzhen; (Faculty of Metallurgical Phisical Chemislry; Northeastern Universily. Shenyang 110006) ZHAO Nairen (Northeastern University; Shenyang 110006)

引用本文:

邹开云;王常珍;赵乃仁. La传感器及碳饱和铁液中La活度测定的研究[J]. 金属学报, 1995, 31(17): 195-199.
, , . LANTHANUM SENSOR AND ACTIVITY OF LANTHANUM IN CARBON SATURATED IRON[J]. Acta Metall Sin, 1995, 31(17): 195-199.

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摘要: 用直接合成法制备了Ｌａβ－Ａｌ２Ｏ３，固体电解质，用阻抗谱技术在８００－１５００℃测得其电导率为１０－６－１０－３Ｓ·ｍ－１不同组成样品的电导激活能在１．９５－２．０７ｅＶ之间。用Ｃｏｕｌｏｍｂ滴定抽Ｌａ法验证Ｌａβ－Ａｌ２Ｏ３的Ｌａ３＋的导电性；在５００－１６００℃下示差热分析的结果表明，Ｌａβ－Ａｌ２Ｏ３未发现相变和分解制得Ｌａβ－Ａｌ２Ｏ３固体电解质管，以纯Ｌａ作为参比电极，组成Ｌａ传感探头，在１４５０℃测得碳饱和铁液中、不同Ｌａ浓度下溶解态Ｌａ的活度具有规律性；与同时用氧传感探头测得氧的变化规律相符合．在实验条件下，Ｌａ传感探头经过连续多次使用，未见有开裂或渗漏现象，Ｌａ与Ｌａβ－Ａｌ２Ｏ３管不发生作用．

关键词 ：固体电解质, 传感器, Ｌａβ－Ａｌ_２Ｏ_３, 活度, 镧

Abstract：Laβ-Al2O3(La2O3·11Al2O3) type solid electrolytes were prepared by direct synthesis method. In the temperature range of 800-1500℃, the complex impedance measurements on Laβ-Al2O3 were carried out. The relationships between conductivities of Lag-Al2O3 and temperature, and the activation energy for conduction were obtained. The results show that the order of magnitude of conductivities is 10-6 to 10-3S·m-3, the value of the activation energy is 2.0 eV.It is believed that the Laβ-Al2O3 is conductor of La3+ by the coulometric titration. Stability of Laβ-Al2O3 is proved by D.T.A.The rare earth La probe was made by using Lap-Al2O3 as solid electrolyte, pure La as reference electrode, Mo wire as electrode wire. It was used to determine the activity of dissolved La in C saturating melten Fe (1450℃) with different La concentration. The results were corresponding to that of oxygen concentration cell EMF determined by oxygen probe.The results show that the order of magnitude of activity of dissolved La is 10-4 to 10-3. After some experiments, the rare earth La probe did not split.

Key words： solid electrolyte sensor Laβ-Al2O3 activity lanthanum

基金资助:国家自然科学基金

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