Polarized Raman spectra of LiBaB9O15 single crystal

Polarized Raman spectra of LiBaB9O15 single crystal
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LiBaB9O15单晶的偏振拉曼光谱

DOI:
10.1016/j.matlet.2015.10.030
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发表时间:
2016
期刊:
影响因子:
3
通讯作者:
c I. Guedes
c I. Guedes
中科院分区:
材料科学3区
文献类型:
--
作者:
Nana Zhang;Xiaoru Pan;Mingjun Song;Jiyang Wang;b Xiaobo Hu;Huaijin Zhang;C.C. Santos;c I. Guedes

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采用偏振拉曼光谱法测量了LiBaB 9 O 15单晶的室温声子模。LiBaB 9 O 15晶体为三角晶系,空间群为R3 <$c(D3 d 6),每个原胞有两个分子(B= 2)。LiBaB 9 O 15晶体的结构由两个BO 3三角形和一个BO 4四面体组成的三维硼酸盐骨架组成。由于BO 3和BO 4单元共享氧原子,我们不能得到它们的内模按D3 d因子群的不可约表示分布的关联图。唯一可以明确指定的模式是在983 cm− 1处具有A 1g对称性的ν 3(BO 4)和在932 cm− 1处具有E g对称性的ν 1(BO 3)。在群论预言的11 A1 g +25 Eg振动中,我们观测到了7A 1g+6 Eg振动.
We use polarized Raman spectroscopy to obtain the room temperature phonon modes of LiBaB 9 O 15 single crystal, that crystallizes in a trigonal structure belonging to the space group R 3¯ c (D 3 d 6) with two molecules per primitive cell (Z B= 2). The structure of the LiBaB 9 O 15 crystal consists of a three-dimensional borate framework, formed by two BO 3 triangles and one BO 4 tetrahedra. Since BO 3 and BO 4 units share the oxygen atoms, we can not obtain a correlation scheme where their internal modes are distributed in terms of the irreducible representations of the D 3d factor group. The only modes that can unambiguously be assigned are the ν 3 (BO 4) with A 1g symmetry at 983 cm− 1 and the ν 1 (BO 3) with E g symmetry at 932 cm− 1. We observed 7A 1g+ 6E g out of 11A 1g+ 25E g vibrations predicted by the Group Theory.
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