Crystal chemical characteristics of saponite and serpentine: a possible criterion for the direction of the modification process

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

The aim of the present study was to develop an algorithm for calculating the main crystallochemical characteristics and their changes accompanying the process of transformation of the crystal structure of mineral substances. As a pilot object, we selected the mineral saponite, which changes its three-layer crystal structure during mechanical grinding, transforming into a two-layer structure characteristic of the mineral serpentine. A possible algorithm for calculating the main physicochemical indicators of the crystal structure of the minerals saponite and serpentine is shown: the filling density of elementary cells, the strength of chemical bonds, the structural density index of the crystal lattice (γ). Thus, an almost twofold increase in the structural density parameter (γsap=0.323; γserp=0.635) indicates the occurrence of the saponiteserpentine structural transformation process. As an additional criterion for the direction of this process, the values of the atomic density (P) in the crystal lattice were calculated: Psap=0.13 and Pserp=0.22. Determining the number of broken bonds ka(t) in the process of saponite transformation into serpentine and comparing it with the ratio 2hsl/D0 (D0 is the particle diameter) made it possible to implement a kinetic description of this process and determine the maximum thickness of the surface (activated) layer (hsl), equal to 20 μm.

Толық мәтін

Рұқсат жабық

Авторлар туралы

M. Frolova

Northern (Arctic) Federal University named after M.V. Lomonosov

Хат алмасуға жауапты Автор.
Email: m.aizenstadt@narfu.ru

Candidate of Sciences (Chemistry)

Ресей, 17, Northern Dvina Embankment, Arkhangelsk, 163002

E. Korolev

Saint Petersburg State University of Architecture and Civil Engineering

Email: prorector_nr@spbgasu.ru

Doctor of Sciences (Engineering)

Ресей, 4, 2-ya Krasnoarmeyskaya Street, Saint Petersburg, 190005

A. Ayzenshtadt

Northern (Arctic) Federal University named after M.V. Lomonosov

Email: a.isenshtadt@narfu.ru

Doctor of Sciences (Chemistry)

Ресей, 17, Northern Dvina Embankment, Arkhangelsk, 163002

G. Garamov

Northern (Arctic) Federal University named after M.V. Lomonosov

Email: g.garamov@narfu.ru

Graduate Student

Ресей, 17, Northern Dvina Embankment, Arkhangelsk, 163002

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2. Fig. 1. Crystal structure of saponite (a) and serpentine (b) [6, 9]

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Метадеректер
3. Fig. 2. Dependencies 2hsl/D0=f(t) and ϑ2h/D=f(t)

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