Doping behavior and occurrence state of Na impurity in α-calcium sulfate hemihydrate prepared in Na2SO4 solution

被引：0

作者：

Wang, Lusong ^{[1
]}

Li, Xianbo ^{[1
,2
,3
]}

He, Yuqi ^{[1
]}

Huang, Hu ^{[1
]}

Du, Yawen ^{[1
]}

机构：

[1] Guizhou Univ, Min Coll, Guiyang 550025, Peoples R China

[2] Natl & Local Joint Lab Engn Effect Utilizat Reg Mi, Guiyang 550025, Peoples R China

[3] Guizhou Key Lab Comprehens Utilizat Nonmet Mineral, Guiyang 550025, Peoples R China

来源：

JOURNAL OF CRYSTAL GROWTH | 2025年 / 650卷

基金：

中国国家自然科学基金;

关键词：

alpha-Calcium sulfate hemihydrate crystal; Na; 2; SO; 4; solution; Doping behavior; Occurrence state; GAS-DESULFURIZATION GYPSUM;

D O I：

10.1016/j.jcrysgro.2024.127993

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

alpha-calcium sulfate hemihydrate (alpha-CSH) is a green building material. The synthesis of alpha-CSH from industrial phosphogypsum (PG) in Na2SO4 solution is a promising technique, but Na impurity may be introduced into alpha-CSH crystal. In this study, the doping behavior of Na into alpha-CSH was investigated, and the occurrence state of Na in alpha-CSH was clarified. The results show that Na impurity was doped into alpha-CSH in the form of Na2Ca5(SO4)2 & sdot;3H2O, and the doping content of Na2O in alpha-CSH increases with the Na2SO4 concentration and reaction time. Density functional theory (DFT) calculation shows Na impurity is likely to be doped into alpha-CSH crystal through interstitial filling. Unfortunately, the doping of Na into alpha-CSH could cause a visible frost phenomenon for the hardened plaster, which has a negative impact on the practical utilization of alpha-CSH.

引用

页数：9