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The raw materials were thoroughly mixed, placed in platinum crucibles, heated to 750¡ãC for 2h and kept at a constant temperature for 2h.    Õâ¾ä»°Ôõô¸Ä  ±È½ÏºÃ
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£¬heated to 750 at 6.25¡æ/min and preserved 2 hours

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