X‐RAY DIFFRACTION STUDY OF SODA‐BORIC OXIDE GLASS *
X‐RAY DIFFRACTION STUDY OF SODA‐BORIC OXIDE GLASS *
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DOI：
10.1111/j.1151-2916.1938.tb15777.x
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发表时间：
1938-08
影响因子：
3.9
通讯作者：
J. Biscoe;B. Warren
中科院分区：
文献类型：
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作者：
J. Biscoe;B. Warren
本文报道了三种钠硼氧化物玻璃的X射线衍射图，它们的摩尔组成分别为：0.114Na_2O、0.225Na_2O和0.333Na_2O。这些图案是在一个真空相机中制作的，使用的是从岩盐反射的MoK α辐射单色。通过傅立叶分析获得了三种组分的径向分布曲线。分布曲线的第一个峰是由于硼-氧分离。距离分别为1.37、1.42和1.48 A。由峰面积可知，硼周围的氧数为3.2、3.7、3.9。原子间距离和周围氧原子数的连续变化表明硼原子部分以三角形配位，部分以四面体配位，且四面体配位的比例随碱含量的增加而增加。在2.4A下，每个钠有六个氧，在2.4A下，每个氧有五到六个氧，与分布曲线一致。结果可以解释在玻璃质钠硼氧化物的随机网络图片，其中硼键合到三个或四个氧和钠原子随机分布在孔中的硼-氧网络。最大值和最小值的玻璃含有氧化硼和苏打的物理性质的解释方面的能力，硼原子改变四面体配位时，一些氧化物，如Na 2 O是目前提供必要的额外的氧。
X-ray diffraction patterns have been made of three samples of soda-boric oxide glass of the following molal compositions: 0.114 Na2O, 0.225 Na2O, and 0.333 Na2O. The patterns were made in an evacuated camera, using MoK α radiation monochromatic by reflection from rock salt. Radial distribution curves for the three compositions were obtained by Fourier analysis. The first peak of the distribution curves is due to the boron-oxygen separation. The distances are 1.37, 1.42, and 1.48A. From the peak areas, the number of oxygens about a boron is found to be 3.2, 3.7, and 3.9. The continuous change, both in interatomic distance and number of surrounding oxygens, indicates that the borons are partly in triangular and partly in tetrahedral coordination, the fraction in the latter increasing with increase of soda. Six oxygens about each sodium at 2.4A and from five to six oxygens about each oxygen at 2.4A are consistent with the distribution curves. The results can be interpreted in terms of a random network picture of vitreous soda-boric oxide, in which the borons are bonded either to three or four oxygens and the sodium atoms are randomly distributed in holes in the boron-oxygen network. Maxima and minima in the physical properties of glasses containing boric oxide and soda are explained in terms of the ability of the boron atom to change to tetrahedral coordination when some oxide such as Na2O is present to supply the necessary extra oxygen.