The reaction between (ZrO)2P2O7 and NiO at elevated temperatures up to 1340 °C yielded Ni3(PO4)2 and ZrO2 over the whole composition. The reaction between ZrP2O7 and NiO yielded NiO·4ZrO2·3P2O5 and Ni3(PO4)2 in the molar ratios up to equimolarity.
Glass formation was investigated in the Na2O–TiO2–P2O5, K2O–TiO2–P2O5, BaO–TiO2–P2O5,Na2O–BaO–P2O5, and Na2O–BaO–TiO2–P2O5 systems. In the Na2O–TiO2–P2O5 system, glass containing up to 45.5 mol% TiO2 was found to be formed at the composition of Na2O/P2O5=1, whereas in the K2O–TiO2–P2O5 system the glass formation was observed in a narrow region along the composition of K2O/P2O5=1 in a three-component diagram. In the BaO–TiO2–P2O5 system, only the glass containing about 10 mol% TiO2 as a maximum was obtained. In the Na2O–BaO–TiO2-P2O5 system, the region of glass formation extended with an increase of Na2O up to 30 mol%. These results suggested that a certain amount of Na2O is necessary for the formation of glass containing a large amount of TiO2 in the presence of BaO. The three-component diagrams of the Na2O–TiO2–P2O5 and Na2O–BaO–P2O5 systems indicated that the most favorable amount of Na2O for the glass formation in this four-component system is 27 to 28 mol%.
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