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首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >Verification of the 'T_g-⊿ Rule' in Potassium Silicate and Sodium Tungstate Glasses
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Verification of the 'T_g-⊿ Rule' in Potassium Silicate and Sodium Tungstate Glasses

机译：硅酸钾和钨酸钠玻璃中“T_g-⊿规则”的验证

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摘要

A linear relationship exists in oxide glasses between glass transition temperature (T_g) and quadrupole splitting (△) of Fe~(3+). DTA and Moessbauer measurements of silicate and tungstate glasses yielded large slopes of 680 and 260℃/(mm s~(-1)) from the slope of the straight lines when Fe~(3+) occupied, as network former (NWF), distorted tetrahedral Si~(4+) and distorted octahedral W~(6+) sites, respectively. This linear relationship, named a "T_g-△ rule", suggests that T_g is in proportion to the distortion of NWF-oxygen polyhedra and a higher activation energy is required for the fragments of glass to have a cooperative movement in the supercooled liquid state. The "T_g-△ rule" was also valid in the case of potassium silicate glasses heat treated at the temperature close to T_g, indicating a distortion of SiO_4 and FeO_4 tetrahedra. Substitution of Fe~(3+) for individual NWF in silicate and tungstate glasses was confirmed from the Fourier transform infrared (FT-IR) spectra because only the absorption bands due to Si and W were respectively observed without the bands due to Fe.
机译：氧化物玻璃的玻璃化转变温度（T_g）与Fe〜（3+）的四极分裂（△）之间存在线性关系。 DTA和Moessbauer对硅酸盐和钨酸盐玻璃的测量从Fe〜（3+）作为网络形成物（NWF）占据时的直线斜率得出了680和260℃/（mm s〜（-1））的大斜率，扭曲的四面体Si〜（4+）和扭曲的八面体W〜（6+）位。该线性关系称为“ T_g-△法则”，表明T_g与NWF-氧多面体的变形成比例，并且需要更高的活化能以使玻璃碎片在过冷液态下具有协同运动。在接近T_g的温度下热处理的硅酸钾玻璃的情况下，“ T_g-△法则”也有效，表明SiO_4和FeO_4四面体变形。通过傅立叶变换红外光谱（FT-IR）证实了硅酸盐和钨酸盐玻璃中单个NWF的Fe〜（3+）取代，因为仅分别观察到由于Si和W引起的吸收谱带，而没有由于Fe引起的谱带。

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