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Structure and physico-chemical properties of minerals of biogenic origin in comparison with their natural abiogenic analogues

ABSTRACT

Report on the SRW: 1 book, 135 pages, 45 illustrations, 19 tables, 91 references.

The objects of the study are biogenic, synthetic and abiogenic apatites of different composition and structure.

The purpose of the work: To find out the factors that determine the special properties of biominerals, in comparison with their natural abiogenic analogues, to establish the crystal-chemical features of isostructural biominerals and natural abiogenic minerals, to develop recommendations for solving fundamental and applied problems of mineralogy, biomineralogy and materials science based on the obtained results.

Research methods and equipment: the method of nuclear magnetic resonance on nuclei ¹H, ¹⁹F and ³¹P in stationary mode, in situ and in the mode of high resolution during rotation of the sample under the magic angle (MAS) (spectrometer Avance-400 (Bruker, Germany)), the method of electronic paramagnetic resonance (EPR RE-1306 spectrometer), computer modeling in the GULP program, Stoe ICSD diffractometer and Bruker Phaser D2 (CuKa radiation), Bruker spectrometers (IFS 66v/S; Globar (MIR), DTGS-Detector) and Nicolet 6700 with Fourier transform. The JCPDS PDF database was used to identify the phase composition.

Results and their novelty: a significant volume of new data was obtained on the features of the crystal chemistry of bioapatite (animal bones), synthetic hydroxylapatite (HAP), and carbonate fluoroapatite (CFAP), with REE impurities - HAP and fluorohydroxyapatite (FGAP), apatites of igneous rocks and the composition of pathogenic phosphates. In particular, it was established that synthetic KFAP, REE-FGAP and magmatic apatites are characterized by the presence of H₂O molecules fixed in the structure (H₂Ostr) and excess fluoride ions outside the channels (F_x), the synthesis of KFAP at low temperatures in an aqueous environment is accompanied by the entry of OH into the channels -groups, the partial substitution of OH → F leads to noticeable changes in the patterns of occurrence of REE in the apatite structure. It was shown that the patterns of H₂Ostr molecules and Fx ions entering the structure reproduce the conditions of apatite formation and changes in its structure caused by isomorphic substitutions.

Recommendations regarding the use of the results of the work: The results can be used in geology and mineralogy when solving a wide range of geological and mineralogical problems, including determining the conditions of formation/transformation of apatites; in materials science in the development of technologies for the synthesis of apatites with predetermined properties and in solving the problems of retrospective dosimetry of apatites.

Authors:

Kalinichenko Anatolii Mykhailovych

Dudchenko Nataliia Oleksandrivna

Kalinichenko Olena Anatoliivna

Bahmut Mykola Mykolaiovych

Other authors:

Keywords:

Apatite, isomorphic substitutions, nuclear magnetic resonance, electron paramagnetic resonance, X-ray phase analysis

Head of the research:

Bryk Oleksandr Borysovych

Registration Card (RC):

0111U005651

Execution period of the research:

2012 - 2016