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ÎÄÏ×ÖйØÓÚddµÄÃèÊö The method of differential dissolving (DD) was used to determine stoichiometric compositions of phases in the samples. To provide dissolution, the powder samples were treated with an aqueous solution; the concentration of HCl was linearly increased from 0 to 1.2 N. The main process of dissolution proceeds when H2SO4 - H3PO4 - HClO4 - HNO3, 6:3:1.5:1 (acid mixture-water, 1:10) and it stops in the HF solution (diluted 1:5). The temperature was gradually increased from 20 to 70¡æ. ×îºóÄÇЩËáʲôÒâ˼£¬Ò²²»ÊÇÌØÃ÷°×£¬Ï£ÍûÓиßÈËÄÜÖ¸µãһϡ£ »¹ÓоÍÊDzâÊÔ½á¹ûµÄͼ£¬ÎÄÕ·ÖÎöµÄ²»Ã÷°×£¬Ò²Ï£ÍûÓиßÈËÄÜÖ¸µãһϠ|
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