INFRARED-SPECTROSCOPY OF NETWORK AND CATION DYNAMICS IN BINARY AND MIXED-ALKALI BORATE GLASSES
INFRARED-SPECTROSCOPY OF NETWORK AND CATION DYNAMICS IN BINARY AND MIXED-ALKALI BORATE GLASSES
复制标题
DOI：
10.1016/0022-3093(94)00555-9
复制
发表时间：
1995-03-01
影响因子：
3.5
通讯作者：
DENHARTOG, HW
中科院分区：
文献类型：
--
作者：
VERHOEF, AH;DENHARTOG, HW
在10-5000 cm ~（-1）频率范围内，测量了20种不同类型（B_2 O_3）（1-x-y）（Li_2 O）（x）（Cs_2 O）（y）玻璃的红外反射光谱。从这些光谱，红外吸收和介电光谱已被计算使用Kramers-Kronig反演技术。中红外部分的光谱进行了讨论与B-O网络振动模式。光谱的远红外部分产生阳离子振动模式，这明显取决于玻璃组合物。每种阳离子出现两个吸收带与单、双占据网络位置有关。看起来Li+离子振动是局部网络结构的敏感函数，但是Cs+离子振动仅取决于由周围玻璃网络的较大部分提供的总电荷。在二元含锂玻璃中，在约60 cm（-1）处出现介电弛豫。该松弛被分配给“不成功跳”模式。远红外介电结果可以平滑地连接到GHz区域的介电谱。
Infrared reflectance spectra of twenty different glasses of the type (B2O3)(1-x-y)(Li2O)(x)(Cs2O)(y) have been measured in the frequency range of 10-5000 cm(-1). From these spectra, infrared absorbance and dielectric spectra have been calculated using the Kramers-Kronig inversion technique. The mid-infrared parts of the spectra are discussed in connection with B-O network vibrational modes. The far-infrared parts of the spectra yield cation vibrational modes, which distinctly depend on the glass composition. The occurrence of two absorbtion bands for each cation species is associated with single and double occupation of network sites. It appears that the Li+ ionic vibrations are a sensitive function of the local network structure, but that the Cs+ ionic vibrations depend only on the total charge provided by a larger part of the surrounding glass network. In the binary lithium-containing glasses, a dielectric relaxation at approximate to 60 cm(-1) arises. This relaxation is assigned to an 'unsuccessful hop' mode. The far-infrared dielectric results can be connected smoothly to dielectric spectra in the GHz region.