The consitution of NaPO3-GeO2 melts.

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The glassy and crystalline thermal products were prepared by heating a mixture of sodium phosphate glass and germanium dioxide with P/Ge ratios of 1.0–300 at 1000 °C for 3 h in a platinum crucible, and by then rapidly quenching the resulting melt. The thermal products with P/Ge ratios larger than 50 were glassy. The products with P/Ge ratios smaller than 30 were a mixture of glassy and crystalline substances, and the quantity of the glassy substance in the mixture increased with an increase in the P/Ge ratio. The crystalline substance was insoluble in water. From the results of the distribution and the average chain length of the condensed phosphates present in the glassy thermal products, it was concluded that the glass has P–O–Ge linkages and that the most reasonable chemical structure of the glass is (Remark: Graphics omitted.). The colorimetric determination of the phosphorus and germanium contained in the crystalline thermal product showed that the P/Ge ratio of the crystalline substance is 1.3. The value of the P/Ge ratio corresponds to that of Ge3(PO4)4.
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