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Pulsed Cathodoluminescence of Two-Alkali Sodium Potassium Silicate Glasses

机译:两碱硅酸钾钠玻璃的脉冲阴极发光

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摘要

Alkali silicate glasses of variable composition 22chiNa_2O centre dot 22(1 - chi)K_2O centre dot 3CaO centre dot 75SiO_2 with equimolecular replacement of sodium ions by potassium ions are investigated using pulsed cathodoluminescence.It is revealed that localized electronic states interact with vibrations of two types,namely,polarization vibrations of the silicon-oxygen network with the frequency v_0 = 820 cm~(-1) and bending vibrations of the modifier sublattice.At low concentrations of one of the alkali components (x < 0.1),bending vibrations are observed at two frequencies.These frequencies coincide with those of the corresponding vibrations in one-alkali systems containing Na (530 cm~(-1)) and K (520 cm~(-1)).At higher concentrations (chi in the range ~0.14-0.86),there occur bending vibrations of the cationic sublattice with a frequency of 420 cm~(-1).This can be interpreted as a luminescence analog of two-alkali (mixed-alkali) effect.
机译:利用脉冲阴极发光研究了组成可变的22chiNa_2O中心点22(1-chi)K_2O中心点3CaO中心点75SiO_2并用钾离子等价取代钠离子的碱金属硅酸盐玻璃,发现局部电子态与两种类型的振动相互作用。 ,即频率为v_0 = 820 cm〜(-1)的硅氧网络的极化振动和改性剂亚晶格的弯曲振动。在低浓度的一种碱组分(x <0.1)下,观察到弯曲振动。在包含Na(530 cm〜(-1))和K(520 cm〜(-1))的一碱系统中,这些频率与相应的振动频率一致。 0.14-0.86),阳离子亚晶格发生弯曲振动,振动频率为420 cm〜(-1),可以解释为两碱(混合碱)效应的发光模拟。

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