摘要
采用Raman光谱法,结合量子化学计算,进行不同温度下NaNO3、KNO3和NaNO2熔盐的结构研究,发现这3种物质Raman特征峰的半高宽随温度的增高而增大;得到3种熔体中N-O离子团的v1特征峰Raman频移随N-O键长的变化关系方程;同时研究还发现,NaNO3和KNO3熔化后,NO3^-的v1特征峰红移,而NaNO2熔化后,NO2^-的v1特征峰蓝移,且随着温度的升高,熔融态的3种物质中N-O离子团的N-O键长增加。研究结果有助于进一步开展二元和三元混合熔盐的结构变化研究。
Molten mixture of NaNO3, KNO3 and NaNO2 are widely used as heat transfer and heat storage medium in modern industry. The structure of the molten salts is closely related to their thermophysical properties. The structure change of NaNO3, KNO3 and NaNO2 molten salts under different temperatures is studied by Raman spectroscopy method combined with quantum chemical calculation. The results show that the half width of Raman characteristic peaks of these three substances increases with the increase of temperature. The relationship equation between the Raman frequency shift and the N--O bond length of v~ characteristic peak of N--O ion clusters in the three kinds of melts is obtained. It is also found that v, characteristic peak of NO3^- in melting NaNO3 and KNO3 shows red shift, and NO2^- in melting NaNO2 shows blue shift. With temperature increasing, N-O bond length of N-O complex in three melting salts increases. The obtained results will help to further study the structural changes of binary and ternary mixed molten salts.
作者
胡宪伟
史向凯
张宽
李晓飞
Hu Xianwei;Shi Xiangkai;Zhang Kuan;Li Xiaofei(School of Metallurgy, Northeastern University, Shenyang 110819, China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2018年第4期952-956,共5页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51474060)
教育部中央高校基本科研业务费(N150204010)
