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SUMMARY:EFFECT OF TiOy STOICHIOMETRY ON THE STRUCTURE  OF TiOy/HAP NANOCOM
 POSITE
DTSTART;VALUE=DATE-TIME:20200713T132700Z
DTEND;VALUE=DATE-TIME:20200713T132800Z
DTSTAMP;VALUE=DATE-TIME:20260310T101059Z
UID:indico-contribution-1025@indico.inp.nsk.su
DESCRIPTION:Speakers: Danil Eselevich (Institute of Solid State Chemistry 
 UB RAS)\nComposite materials based on hydroxyapatite (HAP) are of much int
 erest for biology and medicine owing to their bioactivity. The advanced st
 rength properties of HAP can be achieved by its reinforcement with dispers
 ed titanium and titanium oxide particles. This makes it possible to combin
 e biocompatibility with high mechanical strength and fracture toughness.  
  \nThe structure of initial TiOy nanopowders and nanocomposite materials H
 AP/TiOy with different stoichiometry (TiO0.92 and TiO1.23) has been studie
 d. The XRD\, IR and Raman spectroscopy methods were used to establish the 
 dependence of the shift and relative intensity of bands in the region of 1
 44–151 cm–1 in Raman spectra on the relative content of vacancies and 
 Ti-O bond length. Depending on the stoichiometry of additive during heat t
 reatment\, surface groups [Ti(OH)2]2+ and [TiHPO4]2+ are formed on interfa
 ces of matrix and reinforcing additive nanoparticles\, partial cationic he
 terovalent substitution of Ti3+ and Ti4+ for Ca2+ takes place\, and new ph
 ases\, in particular Ti4.5O5 and TiO2\, are formed. The stoichiometry of a
 dditives affects the initial process of formation of new phase\, the phase
  composition of nanocomposites at different annealing stages\, as well as 
 the physical properties of final product.   \nOf interest are the in situ 
 studies of the physicochemical properties of HAP/TiOy nanocomposites on a 
 synchrotron radiation source\, which can provide an insight into the pecul
 iarities of interaction of additives with the matrix and the sequence of p
 hase formation when nanoparticles come in contact.   \nThe reported study 
 was funded by RFBR\, project number 20-03-00675.\n\nhttps://indico.inp.nsk
 .su/event/24/contributions/1025/
LOCATION:
URL:https://indico.inp.nsk.su/event/24/contributions/1025/
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