Structural chemistry of silicates: new discoveries and ideas

Pushcharovsky, Dmitry Yu.; Zubkova, N. V.; Pekov, Igor V.

doi:10.1007/s11224-016-0750-9

Cited by 15 publications

(4 citation statements)

References 41 publications

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“…The two-step dehydration described by Bussen et al (1972) (Rius et al, 2004(Rius et al, , 2009; and sveinbergeite, (H 2 O) 2 (Ca(H 2 O))-(Fe 6 2+ Fe 3+ )Ti 2 [Si 4 O 12 ] 2 O 2 (OH) 4 ((OH)H 2 O)) (Khomyakov et al, 2011). We note that the silicate subframework found in the crystal structure of ilmajokite is new and has not been observed previously in any mineral or inorganic compound (Pushcharovsky et al, 2016).…”

Section: Crystal-chemical Formulasupporting

confidence: 57%

Extraordinary structural complexity of ilmajokite: a multilevel hierarchical framework structure of natural origin

Zolotarev

Krivovichev

Cámara

et al. 2020

IUCrJ

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The crystal structure of ilmajokite, a rare Na-K-Ba-Ce-titanosilicate from the Khibiny mountains, Kola peninsula, Russia, has been solved using single-crystal X-ray diffraction data. The crystal structure is based on a 3D titanosilicate framework consisting of trigonal prismatic titanosilicate (TPTS) clusters centered by Ce3+ in [9]-coordination. Four adjacent TPTS clusters are linked into four-membered rings within the (010) plane and connected via ribbons parallel to 101. The ribbons are organized into layers parallel to (010) and modulated along the a axis with a modulation wavelength of csinβ = 32.91 Å and an amplitude of ∼b/2 = 13.89 Å. The layers are linked by additional silicate tetrahedra. Na+, K+, Ba2+ and H2O groups occur in the framework cavities and have different occupancies and coordination environments. The crystal structure of ilmajokite can be separated into eight hierarchical levels: atoms, coordination polyhedra, TPTS clusters, rings, ribbons, layers, the framework and the whole structure. The information-based analysis allows estimation of the complexity of the structure as 8.468 bits per atom and 11990.129 bits per cell. According to this analysis, ilmajokite is the third-most complex mineral known to date after ewingite and morrisonite, and is the most complex mineral framework structure, comparable in complexity to paulingite-(Ca) (11 590.532 bits per cell).

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Section: Crystal-chemical Formulasupporting

confidence: 57%

Extraordinary structural complexity of ilmajokite: a multilevel hierarchical framework structure of natural origin

Zolotarev

Krivovichev

Cámara

et al. 2020

IUCrJ

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“…In comparison to carbonates, borates, and silicates are structurally more diverse, and thousands of silicates and borates are known. − The structural diversity in silicates arises from the flexibility of the Si–O–Si angles between polymerized [SiO 4 ] 4– -tetrahedra . Borates are structurally diverse not only due to the polymerization of building blocks but also due to the concomitant presence of [BO 4 ] 5– -tetrahedra and planar trigonal [BO 3 ] 3– -groups in a structure .…”

Section: Introductionmentioning

confidence: 99%

Anhydrous Aluminum Carbonates and Isostructural Compounds

Bayarjargal,

Spahr,

Milman

et al. 2023

Inorg. Chem.

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We synthesized the inorganic anhydrous aluminum carbonates Al2[C2O5][CO3]2 and Al2[CO3]3 by reacting Al2O3 with CO2 at high pressures and temperatures and characterized them by Raman spectroscopy. Their structures were solved by X-ray diffraction. Al2[CO3]3 forms at around 24–28 GPa, while Al2[C2O5][CO3]2 forms above 38(3) GPa. The distinguishing feature of the new Al2[C2O5][CO3]2-structure type is the presence of pyrocarbonate [C2O5]2–-groups, trigonal [CO3]2groups, and octahedrally coordinated trivalent cations. Al2[CO3]3 has isolated [CO3]2–-groups. Both Al-carbonates can be recovered under ambient conditions. Density functional theory calculations predict that CO2 will react with Fe2O3, Ti2O3, Ga2O3, In2O3, and MgSiO3 at high pressures to form compounds which are isostructural to Al2[C2O5][CO3]2. MgSi[C2O5][CO3]2 is predicted to be stable at pressures relative to abundant mantle minerals in the presence of CO2. This structure type allows the incorporation of four elements (Mg, Si, Fe, and Al) abundant in the Earth’s mantle in octahedral coordination and provides an alternative phase with novel carbon speciation for carbon storage in the deep Earth.

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“…Summary of physicochemical properties of mineral adsorbents commonly used for adsorbing mycotoxins(Deepthy and Balakrishnan 2005;Lantenois et al 2008;Pushcharovsky et al 2016) …”

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confidence: 99%

Potential adverse effects on animal health and performance caused by the addition of mineral adsorbents to feeds to reduce mycotoxin exposure

2019

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The contamination of feed with mycotoxins is a continuing feed quality and safety issue, leading to significant losses in livestock production and potential human health risks. Consequently, various methods have been developed to reduce the occurrence of mycotoxins in feed; however, feed supplementation with clay minerals or mineral adsorbents is the most prominent approach widely practiced by farmers and the feed industry. Due to a negatively charged and high surface area, pore volume, swelling ability, and high cation exchange capacity, mineral adsorbents including bentonite, zeolite, montmorillonite, and hydrated sodium calcium aluminosilicate can bind or adsorb mycotoxins to their interlayer spaces, external surface, and edges. Several studies have shown these substances to be partly or fully effective in counteracting toxic effects of mycotoxins in farm animals fed contaminated diets and thus are extensively used in livestock production to reduce the risk of mycotoxin exposure. Nevertheless, a considerable number of studies have indicated that these agents may also cause undesirable effects in farm animals. The current work aims to review published reports regarding adverse effects that may arise in farm animals (with a focus on pig and poultry) and potential interaction with veterinary substances and nutrients in feeds, when mineral adsorbents are utilized as a technological feed additive. Furthermore, results of in vitro toxicity studies of both natural and modified mineral adsorbents on different cell lines are reported. Supplementation of mycotoxin-contaminated feed with mineral adsorbents must be carefully considered by farmers and feed industry.

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Structural chemistry of silicates: new discoveries and ideas

Cited by 15 publications

References 41 publications

Extraordinary structural complexity of ilmajokite: a multilevel hierarchical framework structure of natural origin

Extraordinary structural complexity of ilmajokite: a multilevel hierarchical framework structure of natural origin

Anhydrous Aluminum Carbonates and Isostructural Compounds

Potential adverse effects on animal health and performance caused by the addition of mineral adsorbents to feeds to reduce mycotoxin exposure

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