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A cement powder consisting of sodium calcium phosphate, Na 3 Ca 6 (PO 4 ) 5 , in addition to tetracalcium phosphate and β-tricalcium phosphate was prepared by pulverizing blocks of 4wt% sodium-,11wt% carbonate-containing apatite samples that were heated at 1700°C for 5h. When mixed with 30wt% malic acid or citric acid at a powder liquid ratio of 3:1, the cement set...
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