Synthesis and crystallographic study of Pb–Sr hydroxyapatite solid solutions by high temperature mixing method under hydrothermal conditions

Abstract

Abstract:The solid solutions in the system of Pb and Sr hydroxyapatite, Sr 10-x Pb x HAp (x= 0-10), were successfully synthesized by high-temperature mixing method (HTMM) at 160ºC for 12 hours under hydrothermal conditions. The samples were characterized by X-ray diffraction, chemical analysis and electron microscopic observation, and the site of the metal ions in the solid solutions was analyzed with the Rietveld method.The lattice constants, both a and c, of the solid solutions varied linearly with Pb content. It was found that Pb ions in the solid solutions preferentially occupied the M (2) site in the apatite structure. HTMM gives Sr-Pb HAp solid solutions much better crystallization. However, due to the formation of intermediate compound of

Synthesis and Characterization of K(Ta<SUB><I>x</I></SUB>Nb<SUB>1−<I>x</I></SUB>)O<SUB>3</SUB> Particles by High Temperature Mixing Method Under Hydrothermal and Solvothermal Conditions

“…The starting solutions and raw materials for HTMM are separately heated to a preset reaction temperature in a double-chambered autoclave before they are mixed to start the hydrothermal reactions. In our previous work, Cd-Hap, 18 Pb-Sr Hap 19 and (K, Na)NbO 3 20 21 powders were successfully synthesized via HTMM.…”

Hydrothermal synthesis of sodium niobate with controllable shape and structure

“…This method has the advantage of avoiding the formation of intermediates and undesired phases during the heating process. In our group, the HTMM have been successfully used to synthesize a variety of materials including Ca-Sr hydroxyapatite, 14 Ca-Cd hydroxyapatite, 15 and Pb-Sr hydroxyapatite, 16 as well as (K,Na)NbO 3 . 17 In the present study, we extend the HTMM for the controllable synthesis of hexagonal NaNbO 3 through understanding the synthetic mechanism.…”

Synthesis of element-substituted hydroxyapatite with controllable morphology and chemical composition using calcium silicate as precursor

“…26 Therefore, control over the morphology and chemical composition of HAp is of great importance for its applications, and many strategies have been developed to synthesize HAp with controllable morphologies and/or ion-substitutions. 8,14,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] However, until now, the traditional strategies for controlling the morphology of HAp crystals are soft-chemical method based on the template-directing. Wang et al synthesized HAp nanowires with diameter 60 nm and length 1 mm by the solvothermal microemulsion method using cetyltrimethylammonium bromide (CTAB) as template-directed regents.…”