Eu掺杂对γ-Ce_2S_3合成温度及抗氧化性能的影响

Effect of Eu-Doping on Synthesis Temperature and Oxidation Resistance of γ-Ce_2S_3

本文以CeCl_3·7H_2O、Eu_2O_3、C_2H_2O_4·2H_2O为原料,制备了铈铕草酸盐沉淀,该沉淀经高温煅烧获得铈铕氧化物前驱体;以Ar气为载气、CS_2为硫源对铈铕氧化物前驱体进行硫化合成了Eu^(2+)掺杂的γ-Ce_2S_3。Eu^(2+)掺杂能够明显降低γ-Ce2S3的合成温度,Eu^(2+)/Ce^(3+)为0. 03时,在900℃硫化150min即可获得纯相的γ-Ce_2S_3,与不掺杂时合成γ-Ce_2S_3的温度相比降低了300℃左右;同时,Eu^(2+)掺杂能够提升γ-Ce_2S_3的抗氧化能力,氧化气氛下,Eu^(2+)/Ce^(3+)比例为0. 03的样品其氧化放热峰温度由不掺杂时的490. 6℃提高至553. 3℃。

In this paper,CeCl3·7H2O,Eu2O3 and C2H2O4·2H2O were used as raw materials to prepare europium-doped cerium oxalate by oxalate coprecipitation process.The europium-doped cerium oxalate was calcined into europium-doped cerium oxide precursor.This precursor was vulcanized into europium-dopedγ-Ce2S3 by CS2 with Ar as the carrier gas.The results showed that using Eu2+ion doping can lower the synthesis temperature and improve the temperature stability of europium-dopedγ-Ce2S3.When the ratio of Eu2+and Ce3+was 0.03,the pure phase ofγ-Ce2S3 can be obtained by vulcanized at 900℃for 150 min.The synthesis temperature ofγ-Ce2S3 had decreased by 300℃than that of pureγ-Ce2S3,and the oxidation exothermic peak of europium-dopedγ-Ce2S3 increases from490.6℃to 553.3℃.