Синтез и свойства твердых растворов гидроксиапатит – фторапатит

Твердые растворы фторзамещенного гидроксиапатита кальция составов Ca₁₀(PO₄)₆(OH)_2–xFx, x = 0,0;

0,2; 0,5; 1,0; 1,5; 2,0 получены при взаимодействии Ca₁₀(PO₄)₆(OH)₂, Ca₃(PO₄)₂ и СаF₂ в ходе твердофазной реакции синтеза при 1200 °С в течение 3 ч на воздухе. Продукты синтеза идентифицировали с использованием рентгенофазового и рентгенофлуоресцентного анализов, инфракрасной и импедансной спектроскопии.  По результатам рентгенофазового анализа синтезированные твердые растворы обладали структурой гексагонального апатита, крайние члены ряда твердых растворов отвечали стандартам JCPDS (Ca₁₀(PO₄)₆(OH)₂ – № 9-0432; Ca₁₀(PO₄)₆F₂ – № 00-003-0736). Колебательные спектры твердых растворов соответствовали структуре апатита с характерными полосами поглощения тетраэдров РО₄^3–, ОН^–-групп; рост содержания фтора в твердых растворах сопровождался типичным смещением полосы 631 см^–1 в область больших значений волновых чисел,  а интенсивность ее последовательно снижалась. С ростом содержания фтора в твердых растворах на частоте 1 кГц тангенс угла диэлектрических потерь не претерпевал значительных изменений, а диэлектрическая проницаемость незначительно снижалась. На основе результатов физико-химического анализа определены фундаментальные взаимосвязи «состав – структура – свойства» для исследованных продуктов синтеза, проведена оценка влияния состава и условий синтеза на кристаллографические (параметры элементарной ячейки) и электрические (диэлектрическая проницаемость, тангенс угла диэлектрических потерь, проводимость) характеристики синтезированных твердых растворов. Твердые растворы фторзамещенного гидроксиапатита кальция перспективны для использования в медицинской практике.

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