Crystal structure and chemical composition of Li-, Fe-, and Mn-rich micas

AbstractIn this paper the relationships between the crystal structure, chemical composition and electronic structure of laser materials, and their optical properties are discussed. A brief description is given of the different laser activators and of the influence of the matrix on laser characteristics in terms of crystal field strength, symmetry, covalency and phonon frequencies. The last part of the paper lays emphasis on the means to optimize the matrix-activator properties such as control of the oxidation state and site occupancy of the activator and influence of its concentration.

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SYNTHESIS, CRYSTAL STRUCTURE OF MONOAND BIS α-AMINONITRILES AND CLASSIFIATION BASED ON CHEMICAL COMPOSITION

Austrian Journal of Technical and Natural Sciences ◽

10.29013/ajt-20-9.10-47-52 ◽

2020 ◽

pp. 47-52

Author(s):

A. A. Kodirov ◽

J. R. Chuliyev ◽

M. K. Mamarakhmonov ◽

I. R. Askarov

Keyword(s):

Crystal Structure ◽

Chemical Composition

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ChemInform Abstract: CHEMICAL COMPOSITION AND CRYSTAL STRUCTURE OF GRAPHITE FLUORIDE

Chemischer Informationsdienst ◽

10.1002/chin.197942033 ◽

1979 ◽

Vol 10 (42) ◽

Author(s):

Y. KITA ◽

N. WATANABE ◽

Y. FUJII

Keyword(s):

Crystal Structure ◽

Chemical Composition ◽

Graphite Fluoride

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From Structure Topology to Chemical Composition. XXIX. Revision of the Crystal Structure of Perraultite, NaBaMn4Ti2(Si2O7)2O2(OH)2F, a Seidozerite-Supergroup TS-Block Mineral from the Oktyabr'skii Massif, Ukraine, and Discreditation of Surkhobite

The Canadian Mineralogist ◽

10.3749/canmin.2000066 ◽

2021 ◽

Author(s):

Elena Sokolova ◽

Maxwell C. Day ◽

Frank C. Hawthorne ◽

Atali A. Agakhanov ◽

Fernando Cámara ◽

...

Keyword(s):

Crystal Structure ◽

Chemical Composition ◽

Structure Type ◽

Titanium Silicate ◽

Space Group ◽

Structure Topology ◽

Ideal Composition ◽

Using Data ◽

Cation Sites ◽

The Ideal

ABSTRACT The crystal structure of perraultite from the Oktyabr'skii massif, Donetsk region, Ukraine (bafertisite group, seidozerite supergroup), ideally NaBaMn4Ti2(Si2O7)2O2(OH)2F, Z = 4, was refined in space group C to R1 = 2.08% on the basis of 4839 unique reflections [Fo > 4σFo]; a = 10.741(6), b = 13.841(8), c = 11.079(6) Å, α = 108.174(6), β = 99.186(6), γ = 89.99(1)°, V = 1542.7(2.7) Å3. Refinement was done using data from a crystal with three twin domains which was part of a grain used for electron probe microanalysis. In the perraultite structure [structure type B1(BG), B – basic, BG – bafertisite group], there is one type of TS (Titanium-Silicate) block and one type of I (Intermediate) block; they alternate along c. The TS block consists of HOH sheets (H – heteropolyhedral, O – octahedral). In the O sheet, the ideal composition of the five [6]MO sites is Mn4 apfu. There is no order of Mn and Fe2+ in the O sheet. The MH octahedra and Si2O7 groups constitute the H sheet. The ideal composition of the two [6]MH sites is Ti2 apfu. The TS blocks link via common vertices of MH octahedra. The I block contains AP(1,2) and BP(1,2) cation sites. The AP(1) site is occupied by Ba and the AP(2) site by K > Ba; the ideal composition of the AP(1,2) sites is Ba apfu. The BP(1) and BP(2) sites are each occupied by Na > Ca; the ideal composition of the BP(1,2) sites is Na apfu. We compare perraultite and surkhobite based on the work of Sokolova et al. (2020) on the holotype sample of surkhobite: space group C , R1 = 2.85 %, a = 10.728(6), b = 13.845(8), c = 11.072(6) Å, α = 108.185(6), β = 99.219(5), γ = 90.001(8)°, V = 1540.0(2.5) Å3; new EPMA data. We show that (1) perraultite and surkhobite have identical chemical composition and ideal formula NaBaMn4Ti2(Si2O7)2O2(OH)2F; (2) perraultite and surkhobite are isostructural, with no order of Na and Ca at the BP(1,2) sites. Perraultite was described in 1991 and has precedence over surkhobite, which was redefined as “a Ca-ordered analogue of perraultite” in 2008. Surkhobite is not a valid mineral species and its discreditation was approved by CNMNC IMA (IMA 20-A).

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