Reaction of sodium chromate with zirconium under vacuum and high temperature

被引：0

作者：

Chen, Yankun ^{[1
]}

Tian, Wenhuai ^{[1
]}

Chen, Xiaojun ^{[1
]}

Han, Long ^{[1
]}

Wang, Jiyu ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

MATERIALS LETTERS | 2025年 / 382卷

关键词：

Reaction mechanism; Na2CrO4; reduction; Zr; NaCrO2; decomposition;

D O I：

10.1016/j.matlet.2024.137849

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, the reaction mechanism of sodium chromate (Na2CrO4) with zirconium (Zr) under vacuum and high temperature was investigated using X-ray diffraction and X-ray photoelectron spectroscopy. The degree of Zr activation increases with increasing temperature. Na2CrO4 is initially reduced to NaCrO2 at temperatures above 600 degrees C. NaCrO2 decomposed spontaneously, and sodium vapor was formed as the temperature increased. Interestingly, metallic chromium (Cr) was detected at high temperatures, possibly due to the reduction of chromium oxide by zirconium. The results clearly illustrate the reduction mechanism, as the temperature increases, the Zr surface is activated and Na2CrO4 is reduced to NaCrO2 by Zr. Subsequently, NaCrO2 is gradually decomposed into Na vapor and Cr2O3, and finally Cr2O3 is reduced to Cr metal and ZrO2 by Zr.

引用

页数：4

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