Structure, Composition and Crystal Chemistry
- Clays by near-infrared spectroscopy: an exercise in data miningG.D. ChryssikosConsider a clay deposit as an object of very large dimensions that is decorated by various types of water and OH and has immense (geological, mineralogical, chemical) complexity.People care to understand
...
- Quantitative level in determination of phase content and structural parameters of clay mineralsB.A. SakharovDistinctive features of layer silicates and clay minerals are their high degree of dispersion, presence of various defects, structural and chemical heterogeneity. Therefore, reliable interpretation of the powder X-ray diffraction (XRD)
...
- Methods for determination of trans-vacant and cis-vacant layers in dioctahedral 2:1 phyllosilicatesB.B. Zviagina, V.A. DritsAn important aspect in the general problem of structural and crystal-chemical heterogeneity of minerals is the distribution of octahedral cations over the trans- and cis-sites in dioctahedral 2:1 phyllosilicates and in
...
- The Мineralogical characterization of palygorskite and sepiolite samples having different genesisA.L. Vasiliev, V.V. Nasedkin, N.M. BoevaFour different palygorskite samples from Russia, Ukraine, Uzbekistan and Slovakia and two sepiolite samples from Spain and China having different genesis were studied. The palygorskite samples from Ukraine and Uzbekistan were
...
- Dolocretes and associated palygorskite occurrences in siliciclastic red mudstones of the sariyer formation (middle miocene), southeastern side of the Çanakkale strait, turkeyS. Kadir, M. Eren, E. AtabeySiliciclastic red to claret-red mudstones within alluvial-fan deposits of the Middle Miocene Sarıyer Formation locally contain white mottling, here termed dolocrete, including powdery, nodular and fracture-infilling types. The mineralogical characteristics of
...
- Octahedral cation distribution in glauconites: combination of quadrupole splitting distributions (qsd) for their mÖssbauer spectra and the crystal-chemical modelL.G. Dainyak, V.S. Rusakov, I.A. Sukhorukov, B.B. Zviagina, T.S. Zaitseva, V.A. DritsTwo Upper Riphean glauconites of the Southern Urals (Zaitseva et al., 2008) of close cation composition with unusually low Fe3+/Fe2+ ratios were studied by 57Fe Mössbauer and IR spectroscopy. Distribution of
...
- Intensive unbasal peak data acquisition for 1md polytypeA. Stunda, I. Luse, L. Berzina-CimdinaFor illite 1Md polytype analysis it is necessary to obtain pattern with high resolution of unbasal peaks. The aim of this study is to develop a methodic for intensive unbasal peak
...
- The nanomineral complexes clays characteristics as criterions of development and search of oil-and-gas reserves efficiencyA.Ya. Khavkin, V.V. KrupskayaAt the end of 1980th years the scientific direction «Nanomineralogy of oil-and-gas tanks» (Rundkvist D.V., 1990) was generated. The major component of this direction
...
- The reverse transformation of secondary micas in smectite: gears and practical applicationsG.A. Krinari, J.S. Rahmatullina, M.G. KhramchenkovThe reverse transformation of secondary micas results from re-sedimentation of these rocks in fresh-water pools or from water injection in oil-bearing sandstones. The gears of the phenomenon was understood only after
...
- Feasibility of nqr-spectroscopy as a tool in studies of layered and nanostructured materialsR.R. Gainov, A.V. Dooglav, R.R. Khasanov, A.Y. Orlova, I.A. Evlampiev, N.N. MozgovaThe method of nuclear quadrupole resonance (NQR) has found wide applications in studying physical properties of different kind of materials, particularly, natural and synthetic minerals (Semin et al., 1975). The possibility
...
- Structural properties of yenisei river quaternary overburdenA.V. Mashukov, V,V, Onufrienok, A.E. MashukovaThe Yenisei river clay samples were studied by using X-ray and Mössbauer spectroscopy methods. There was shown the influence of the sizes and form of the particles on the temperature stability
...
- Right- and left- hand microcrystals of kaolinite and their natural abundanceN.D. SamotoinThe formation of right- and left-hand crystals is possible in eleven from the thirty-two existing classes of symmetry, in particular in the primitive and axial classes of all the syngony types.
...
- Iron in eluvial and sedimentary kaolinites: epr dataN.S. Bortnikov, R.M. Mineeva, V.M. Novikov, A.D. Savko, A.G. Berketa, A.V. SperanskyTypomorfic peculiarities of kaolinites of different genesis: eluvial and sedimentary redeposited – Pavlovskoe field, Primorye Territory and sedimentary diagenetic – Latnenskoe field, Voronezh area are studied with EPR. Correspondingly, the serials
...
- Effects of particle surface in the epr spectra of natural kaolinite.R.M. Mineeva, N.S. Bortnikov, S.V. Soboleva, A.V. SperanskyThe majority of signals in the EPR spectra of kaolinite is connected with Fe3+. Some of these ions are directly in the structure of the mineral, others can exist in the
...
- Electron diffraction study of the interstratified tv-cv1m illites from galkinskoe massive sulfide deposit (russia)A.P. Zhukhlistov, I.V. Vikentyev, O.V. RusinovaDispersed Al dioctahedral 2:1 layer silicates can be built of the trans-vacant (tv) or cis-vacant (cv) layers, and also they can be composedof interstratified tv and cv layers [1]. Illites from
...
- Al pillared tagan montmorillonite. physico-chemical characteristicsN.A. Zakarina, L.D. Volkova, A.K. Akurpekova, N.A. KornaukhovaPillared clays can be used for preparing of catalysts for hydrocarbon processing. Pillared clays on the base of layered aluminosilicates differs with the high specific surface area, special pores structure and
...
- Possibilities to determine kaolinite group mineral structures applying quanto sofwareI. Luse, V.V. Krupskaya, M. Randers, I.A. Kisileva, L.V. Melchakova, L.P. OgorodovaThe aim of this study was determinate amount of different and overlapping mineral phases of kaolinite group applying computer based software QUANTO. For that were distinguished different types of kaolinite, separate
...
- Structural transformation of kaolinite during its partial dexydroxylation and dry-grindingA.L. Salyn, H. Lindgreen, V.A. DritsKaolinite is one of the most abundant and industrially important clay mineral. The study of kaolinite behavior under various treatments is of certain scientific and technological interest. The aim of this
...
- Methodology of resent bottoms pretreatment for xrd analysisD.Y. ZdobinThe investigation of mineral composition of resent bottoms is connected with difficulties. These ones can appear while preparing samples for XRD analysis, because of (i)the high organic matter content (ii) calcareous
...
- Growth mechanisms and real structure of kaolinite microcrystalsN.D. SamotoinWith the aid of the electron microscopy method and vacuum decoration with Au we studied the growth mechanisms of kaolinite microcrystals (0.1-0.5 µm) in ore deposits which are connected with eluvial
...
- Computational molecular modeling of nanoconfined aqueous species in clays and related layered materialsA.G. KalinichevMolecular scale knowledge of the structure, thermodynamics, and transport properties of aqueous phases confined by surfaces and nanopores of clays and clay-related materials is crucial for quantitative understanding and prediction of
...
- Nanoreactors on the base of layered double hydroxides pillared with complexonatesV. IsupovLayered hydroxides are a class of inorganic layered matrices; their structure is composed of two-dimensional neutral (Al(OH)3, Mg(OH)2, Ni(OH)2, etc.) or positively charged metal-hydroxide layers (layered double hydroxides) [M(1-X)M(III)X(OH)2]Y+ (M =
...
- Predictive crystal-chemical relations in ti-silicates based on the ts blockE.V. SokolovaCurrently, the crystal structures of about 120 TiBO compounds minerals are known, half of them Ti silicates and half of them Ti oxides. Titanium silicate minerals are common as accessory minerals
...
- Crystal structure of tloh: polytypism induced by the lone electron pair stereochemical activity.O.I. Siidra, S.N. Britvin, S.V. Krivovichev, W. DepmeierThe crystal chemistry of Tl(I) compounds bears a close resemblance to the chemistry of alkali metals. All of the alkaline hydroxides have a layered structure. Here we report on the first
...
- Crystal structure of lomonosovite (re-investigation) and features of its alteration under alkaline solutionsE.A. Selivanova, A.A. ZolotarevHeterofillosilicates of the lomonosovite-murmanite family are the potential source of nanolayers for material science (Ferraris, 2008). However there is single report about their synthetic vanadate variety (Massa, 2000). According to Khomyakov
...
- Structural variations in the solid solution series 4cao*3al2o3*3h2o — 4cao*3ga2o3*3h2o with their 2d sodalite-like layer structures.N.-S. Rahmoun, L. Peters, W. DepmeierEleven members of the solid solution series 4CaO*3Al2O3*3H2O — 4CaO*3Ga2O3*3H2O were prepared hydrothermally and studied by X–ray powder diffraction, electron microprobe analysis and FTIR spectroscopy. No miscibility–gaps were observed. IR–spectra, lattice
...
- Layered silica as a support for titania-platinum modified catalystsM. Wojtowski, K. Knyspel, M. LanieckiThe discovery of family of mesoporous siliceous materials (called M41S) in 1992 started a new era in catalytic community due to unique porous properties of these materials. Porous materials are continuously
...
- Structural principles for layered uranyl selenates with inorganic and organic cationsV.V. Gurzhiy, S.V. KrivovichevThe problem of safe disposal of industrial wastes, in particular, radioactive wastes, is important for the modern technological civilization. Detailed studies and the modeling experiments under laboratory conditions demonstrated that, during
...
- Ab initio study of mg3si4o10(oh)2 talcA.N. ChibisovTalc (Mg3Si4O10(OH)2) is a hydrous magnesium silicate mineral with 2:1 trioctrahedral layered silicate structure with space group symmetry C¯1 (Perdikatsis B., Burzlaff, H., 1981). It plays an important role as an
...
- Geometrical isomerism in layered uranyl selenates: synthesis and crystal structure of (ch3nh3)4(h3o)2[(uo2)5(seo4)8(h2o)](h2o)4V.M. Kovrugin, V.V. Gurzhiy, S.V. KrivovichevCrystals of new organic-inorganic compound, (CH3NH3)4(H3O)2[(UO2)5(SeO4)8(H2O)] (H2O)4 (1), have been prepared by evaporation from aqueous solution of 0.05 g uranyl nitrate, 0.2 ml of 40%–solution of selenic acid, 0.1 ml of
...
- Cation ordering and threefold superstructure in quintinite-2h from the kovdor alkaline massif, kola peninsula, russiaE.S. Zhitova, A.A. Zolotarev, S.V. Krivovichev, V.N. YakovenchukQuintinite, Mg4Al2 (OH)12(CO3)4(H2O), is a member of large family of layered double hydroxides. It has been first described by Chao et al. in 1997 as existing in two polytypic modifications: quintinite-2Н
...
- Synthesis and crystal structure of new layered uranyl selenate (ch3(ch2)3nh3)(h5o2)[(uo2)2(seo4)3(h2o)]P.A. Mikhailenko, V.V. Gurzhiy, S.V. KrivovichevSingle crystals of (CH3(CH2)3NH3)(H5O2)[(UO2)2(SeO4)3(H2O)] (1) were prepared by evaporation from aqueous solution of 0.05 g of uranyl nitrate, 0.2 ml of selenic acid, 0.2 ml of n-butylamine and 2 ml of
...
- Crystal structure of cs-intercalated cuprosklodowskiteM.S. Avdontseva, A.A. Zolotarev, S.V. KrivovichevRecent studies indicate that layered uranyl minerals possess ability to incorporate radionuclides into their structures through ion exchange and intercalation (Burns, 1999). The purpose of this work is to study
...
- Hydrothermal stability of layered silica in comparison to mesoporous materialA. Mikolajczak, K. Knyspel, M. Wojtowski, M. LanieckiSince zeolites were widely use in petroleum industry, scientist start to looking for materials with bigger pores desirable in catalysis of bulk molecules. One of the first material with uniform mesoporous
...
- Synthesis and thermochemical study of nanoplate mg-ni serpentines of lizardite – nepouite seriesL.P. Ogorodova, I.A. Kiseleva, E.N. Korytkova, V.V. GusarovThermochemical study was carried out with the four synthesized nanoplate serpentines of the isomorphous series Mg3Si2O5(OH)4 – Ni3Si2O5(OH)4. As starting materials for synthesis, magnesium, nickel, and silicon oxides and hydroxides and
...
- Organoclays as fillers for polymer materialsV.A. Gerasin, N.D. Merekalova, E.M. AntipovLayered alumosilicates are often used as nanofillers for polymer matrices. Owing to high dispersibility, even small amounts of such nanofillers impart the polymers new properties, which are not found in traditional
...
- Intercalation of nonionic surfacatant into smectite claysR. Guegan, J.M. Beny, R. LefortThe organization of molecules in anisotropic thin films for the development of new technologies is an audacious challenge still. One process of synthesis is the use of layered porous materials such
...
- Particle size effect on organovermiculite preparationD. Placha, K. Barabaszova, G.S. MartynkovaVermiculite is 2:1 planar hydrous phyllosilicate that can be applied in many technological processes. Due to its layered structure the vermiculite can be intercalated by organic cations that replace inorganic cations
...
- Preparation and structure of bentonite-polycation multilayers incorporated in polyacrylamide gel using bentonite-surfactant precursorS.G. Starodubtsev, E.K. Lavrentyeva, E.V. Shtykova, K.A. Dembo, V.V. VolkovTwo-stage synthesis has been developed for the first time to obtain bentonite-poly(1-methyl-4-vinylpyridinium) multilayers incorporated in polyacrylamide gels. At the first stage complex of bentonite with hexadecylpyridinium chloride was entrapped in polyacrylamide
...
- Novel organovermiculites with antibacterial activityS. Holesova, M. ValaskovaClay minerals have continuously attracted attention for the possibility of modifying their layered structure by intercalation. The development of new materials with ability to inhibit bacterial growth is a field of
...
- Natural clay minerals mixturesfor porous cordierites as ceramics nanocomposites componentM. Valaskova, G.S. Martynkova, M. HundakovaThe development of advanced ceramics encountered nowadays is frequently limited to the search for a proper combination of a specific matrix and dispersed phase that should provide a required string of
...
- Manufacturing and characterizationof poveda kaolinite-pyrrole nanocomposites.J. Pascual-Cosp, A. Zapatero, J.A.J. Ramirez del ValleKaolinite is a 1:1 dioctahedral clay mineral composed of structurally asymmetric layers. One side of the layer is gibbsite-like with aluminum atoms coordinated octahedrially with apical oxygen atoms and hydroxyls. The
...
- A molecular dynamics simulation studies of polyvinylpyrrolidone (pvp) intercalated in smectitesM. Szczerba, J. Srodon, M. SkibaPolymer-layered silicate nanocomposites (PLSNs) are of great interest nowadays because they exhibit substantial improvement in mechanic, thermal and other properties compared to the basal polymer. PLSNs consist of a polymer which
...
