| Summary: | Ceramic materials in Na<sub>2</sub>O-CaO-P<sub>2</sub>O<sub>5</sub> system were obtained by firing cement-salt stone made from pastes based on powder mixtures including calcium citrate tetrahydrate Ca<sub>3</sub>(C<sub>6</sub>H<sub>5</sub>O<sub>7</sub>)<sub>2</sub>∙4H<sub>2</sub>O, monocalcium phosphate monohydrate (MCPM) Ca(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub>∙H<sub>2</sub>O and/or sodium dihydrogen phosphate NaH<sub>2</sub>PO<sub>4</sub>. The phase composition of the obtained samples of cement-salt stone after adding water, hardening and drying included brushite CaHPO<sub>4</sub>∙2H<sub>2</sub>O, monetite CaHPO<sub>4</sub> and also unreacted Ca<sub>3</sub>(C<sub>6</sub>H<sub>5</sub>O<sub>7</sub>)<sub>2</sub>∙4H<sub>2</sub>O, Ca(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub>∙H<sub>2</sub>O and/or NaH<sub>2</sub>PO<sub>4</sub>. The phase composition of ceramics in Na<sub>2</sub>O-CaO-P<sub>2</sub>O<sub>5</sub> system obtained by firing cement-salt stone was formed due to thermal conversion of hydrated salt and heterophase reactions between components presented in samples during firing. The phase composition of ceramic samples based on powder mixture of Ca<sub>3</sub>(C<sub>6</sub>H<sub>5</sub>O<sub>7</sub>)<sub>2</sub>∙4H<sub>2</sub>O and Ca(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub>∙H<sub>2</sub>O after firing at 900 °C included β-calcium pyrophosphate (CPP) β-Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub>. The phase composition of ceramic samples based on powder mixture of Ca<sub>3</sub>(C<sub>6</sub>H<sub>5</sub>O<sub>7</sub>)<sub>2</sub>∙4H<sub>2</sub>O, and NaH<sub>2</sub>PO<sub>4</sub> after firing at 900 °C included β-sodium rhenanite β-CaNaPO<sub>4.</sub> The phase composition of ceramic samples based on powder mixture of Ca<sub>3</sub>(C<sub>6</sub>H<sub>5</sub>O<sub>7</sub>)<sub>2</sub>∙4H<sub>2</sub>O, Ca(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub>∙H<sub>2</sub>O and NaH<sub>2</sub>PO<sub>4</sub> after firing at 900 °C included β-Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub>, β-CaNaPO<sub>4,</sub> double calcium-sodium pyrophosphate Na<sub>2</sub>CaP<sub>2</sub>O<sub>7</sub>, and Na-substituted tricalcium phosphate Сa<sub>10</sub>Na(PO<sub>4</sub>)<sub>7</sub>. Obtained ceramic materials in Na<sub>2</sub>O-CaO-P<sub>2</sub>O<sub>5</sub> system including biocompatible and biodegradable phases could be important for treatments of bone tissue defects by means of approaches of regenerative medicine.
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