Study of K^+ doping on structure and properties of γ-Ce_2S_3  

作　　者：Xin Li Yueming Li Fusheng Song Zhumei Wang Yan Hong Zhike Li 

机构地区：[1]School of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,China [2]National Light Industry Key Laboratory of Functional Ceramic Materials,Jingdezhen 333403,China [3]Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi Province,Jingdezhen 333403,China

出　　处：《Journal of Rare Earths》2020年第7期776-783,I0004,共9页稀土学报（英文版）

基　　金：Project supported by National Natural Science Foundation of China (51462010);Natural Science Foundation of Jiangxi Province(20161BAB206132,20171ACB20022);The Innovation fund of Jingdezhen Ceramic Institute (JYC-201803)。

摘　　要：In this study,K+-doped γ-Ce2 S3 was successfully prepared via a gas-solid reaction method using CeO2,K2 CO3,and CS2 as raw materials.The effects of the suitable sulfide system and different molar ratios of K to Ce(nK/Ce=0-0.30) on the phase composition,crystal structure,chromaticity and thermal stability ofγ-Ce2 S3 were systematically investigated.Pure γ-Ce2 S3 was obtained by calcining the doped samples at840℃ for 150 min.After calcination at the same temperature the undoped K+samples exhibit a pure α-phase.Samples with a K/Ce molar ratio(nK/Ce) of 0.10-0.25 comprise only the γ-phase;and when nK/Ce exceeds 0.25,a new heterogeneous phase,KCeS2,emerges.For values of nK/Ce in the range of0-0.25,the γ-Ce2 S3 lattice parameters gradually increases with increasing K+ content.When nK/Ceexceedes 0.25,the lattice parameters remains unchanged.As nK/Ce increased,the synthesized color gradually changes from red to orange—red and finally,to yellow.The redness value a* reaches the maximum(L*=33.86,a*=36.68,b*=38.15) when nK/Ce=0.10,The nK/Ce=0.10 composition continues to exhibit the y-phase after heat treatment at 420℃ for 10 min in air.The K+doping fills the internal vacancies of γ-Ce2 S3 and formed a solid solution,which is beneficial for the stability of its lattice,thus improving the thermal stability of γ-Ce2 S3(from 350 to 420℃).

关 键 词：γ-Ce2S3 Crystal structure CHROMATICITY Thermal stability Potassium ion doping Rare earths 

分 类 号：TQ620.4[化学工程—精细化工]