The molecular second-order nonlinear optical (NLO) properties and the powder second harmonic generation(SHG)of semicarbazide hydrochloride were studied.The molecular and crystal structure dependence of second-order no...The molecular second-order nonlinear optical (NLO) properties and the powder second harmonic generation(SHG)of semicarbazide hydrochloride were studied.The molecular and crystal structure dependence of second-order nonlinearity,transparency and thermal stability was discussed.It was also implied that semicarbazide hydrochloride as an ionic compound played important roles in designing effective second-order NLO materials.展开更多
新型无机二阶非线性光学晶体材料在光电子领域(如频率变换、光调制、通信和信息处理等领域)有着重要的应用,是材料研究的前沿方向之一。1998年以来,人们利用易于发生二阶姜-泰勒效应的离子———d0过渡金属离子(e.g.Mo6+,W6+,V5+,Nb5+)...新型无机二阶非线性光学晶体材料在光电子领域(如频率变换、光调制、通信和信息处理等领域)有着重要的应用,是材料研究的前沿方向之一。1998年以来,人们利用易于发生二阶姜-泰勒效应的离子———d0过渡金属离子(e.g.Mo6+,W6+,V5+,Nb5+)和含有非成键孤对电子(stereochemically active lone pair,SCALP,e.g.I5+,Te4+,Se4+,Sn2+)的阳离子,合成了大量具有非中心对称结构(NCS)的化合物,其中许多显示出很强的倍频效应(>400×α-SiO2),它们是一类有应用前景的非线性光学晶体材料。本文将这些材料分成三类进行综述,即:只含一类二阶姜-泰勒离子(d0或SCALP)的化合物;同时包含两类二阶姜-泰勒离子的化合物以及包含二阶姜-泰勒离子和其他非中心对称基团(共轭π-硼酸盐体系、PO4四面体和d10离子)的化合物。本文分别就新材料探索、单晶生长等综述了近10年来基于二阶姜-泰勒效应的非线性光学晶体材料的研究进展。展开更多
We have synthesized single crystals of CeZnAl3, which is a new member of family of Ce-based intermetallics CeTX3 （T=transition metal, X=Si, Ge, A1）, crystallizing in the non-centrosymmetric tetragonal BaNiSns-type s...We have synthesized single crystals of CeZnAl3, which is a new member of family of Ce-based intermetallics CeTX3 （T=transition metal, X=Si, Ge, A1）, crystallizing in the non-centrosymmetric tetragonal BaNiSns-type structure. Magnetization, specific heat and resistivity measurements all show that CeZnAls orders magnetically below around 4.4 K. Furthermore, magnetization measurements exhibit a hysteresis loop at low temperatures and fields, indicating the presence of a ferromagnetic component in the magnetic state. This points to a different nature of the magnetism in CeZnAl3 compared to the other isostructural CeTAl3 compounds. Resistivity measurements under pressures up to 1.8 GPa show a moderate suppression of the ordering temperature with pressure, suggesting that measurements to higher pressures are required to look for quantum critical behavior.展开更多
文摘The molecular second-order nonlinear optical (NLO) properties and the powder second harmonic generation(SHG)of semicarbazide hydrochloride were studied.The molecular and crystal structure dependence of second-order nonlinearity,transparency and thermal stability was discussed.It was also implied that semicarbazide hydrochloride as an ionic compound played important roles in designing effective second-order NLO materials.
文摘新型无机二阶非线性光学晶体材料在光电子领域(如频率变换、光调制、通信和信息处理等领域)有着重要的应用,是材料研究的前沿方向之一。1998年以来,人们利用易于发生二阶姜-泰勒效应的离子———d0过渡金属离子(e.g.Mo6+,W6+,V5+,Nb5+)和含有非成键孤对电子(stereochemically active lone pair,SCALP,e.g.I5+,Te4+,Se4+,Sn2+)的阳离子,合成了大量具有非中心对称结构(NCS)的化合物,其中许多显示出很强的倍频效应(>400×α-SiO2),它们是一类有应用前景的非线性光学晶体材料。本文将这些材料分成三类进行综述,即:只含一类二阶姜-泰勒离子(d0或SCALP)的化合物;同时包含两类二阶姜-泰勒离子的化合物以及包含二阶姜-泰勒离子和其他非中心对称基团(共轭π-硼酸盐体系、PO4四面体和d10离子)的化合物。本文分别就新材料探索、单晶生长等综述了近10年来基于二阶姜-泰勒效应的非线性光学晶体材料的研究进展。
基金supported by the Science Challenge Project of China(Grant No.TZ2016004)the National Natural Science Foundation of China(Grant Nos.11474251,11604291,and U1632275)the National Key R&D Program of China(Grant Nos.2017YFA0303100,and 2016YFA0300202)
文摘We have synthesized single crystals of CeZnAl3, which is a new member of family of Ce-based intermetallics CeTX3 （T=transition metal, X=Si, Ge, A1）, crystallizing in the non-centrosymmetric tetragonal BaNiSns-type structure. Magnetization, specific heat and resistivity measurements all show that CeZnAls orders magnetically below around 4.4 K. Furthermore, magnetization measurements exhibit a hysteresis loop at low temperatures and fields, indicating the presence of a ferromagnetic component in the magnetic state. This points to a different nature of the magnetism in CeZnAl3 compared to the other isostructural CeTAl3 compounds. Resistivity measurements under pressures up to 1.8 GPa show a moderate suppression of the ordering temperature with pressure, suggesting that measurements to higher pressures are required to look for quantum critical behavior.
