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Showing 1 to 20 of 40 for “"crystal chemistry"”.

  1. The crystal chemistry of titanite

    Higgins, John BrittVirginia Polytechnic Institute and State University1975

    The chemical substitutions of primary importance in natural titanites are (Al,Fe)<sup>3+</sup> + (F,OH)<sup>-</sup> ⇆ T<sub>1</sub><sup>4+</sup> + O<sup>2-</sup> , where total Al + Fe is not greater than 30 mol % and Al is usually predominant. Electron microprobe analyses and bond strength …

    vt Repository record

  2. The crystal chemistry of tetrahedrite

    Johnson, Neil EvanVirginia Polytechnic Institute and State University1986

    … so, whereas Ag:Cu substitution is not. The crystal chemistry of tetrahedrite can be rationalized by considering the structure to be generally analogous to sodalite, i.e., a framework of comer-connected M(l)Y4 tetrahedra containing an ZM(2)₆ octahedron rather than an interframework cation or …

    vt Repository record

  3. The crystal chemistry of staurolite

    Griffen, Dana T.Virginia Polytechnic Institute and State University1972

    … relationships are explained on the basis of the crystal structure and site occupancies. Natural specimens have uniformly shorter a cell edges {by ~0.015Å) than synthetic Fe-Mg staurolites. Improved curves showing the relationship of 2V and refractive indices to Fe-content have been established.

    vt Repository record

  4. The crystal chemistry of organic pigments

    Potts, Graham DavidUniversity of Cambridge1993

    cambridge Repository record

  5. Crystal chemistry of ferric-rich fayalites

    Schaefer, Martha WilliamsMassachusetts Institute of Technology1983

    Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.

    mit Repository record

  6. Crystal chemistry of the humite minerals

    Jones, Norris W.Virginia Polytechnic Institute1968

    … amounts of other mineral impurities. Single crystal x-ray diffraction studies were made on nine microprobe analyzed humites to determine the effects of minor chemical substitution on the unit cell parameters. These studies show that the substitution of (Fe + Mn) for Mg increases the …

    vt Repository record

  7. Mössbauer spectroscopy and crystal chemistry of aenigmatites

    Choi, Jin BeomMassachusetts Institute of Technology1983

    Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.

    mit Repository record

  8. Synthesis and crystal chemistry of lanthanide allanites

    Affholter, KathleenVirginia Tech1987

    Metamictization and complex chemistry are major obstacles to the crystal chemical characterization of natural allanites. To overcome these problems, allanites, Ca(REE)Fe²+Al₂Si₃O₁₂(OH), where REE = La, La-Ce, Ce, Nd, Sm, Eu, Gd, Er, Dy, Yb and Y have been synthesized hydrothermally from unbuffered …

    vt Repository record

  9. Structures and crystal chemistry of wollastonite and pectolite

    Prewitt, Charles TMassachusetts Institute of Technology1962

    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1962.

    mit Repository record

  10. Electron microscopy and crystal chemistry of some AB2Xn compounds

    Barbier, Jacques1985

    aus-cath Repository record

  11. Electron microscopy and crystal chemistry of some AB2Xn compounds

    Barbier, Jacques1985

    anu Repository record

  12. Aspects of the crystal chemistry of organic acid-amides

    King, JohnUniversity of Cambridge1994

    cambridge Repository record

  13. The structures and crystal chemistry of bustamite and rhodonite

    Peacor, D. R. (Donald R.)Massachusetts Institute of Technology1962

    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1962.

    mit Repository record

  14. The structures and crystal chemistry of the aluminum-silicate minerals

    Burnham, Charles WMassachusetts Institute of Technology1961

    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1961.

    mit Repository record

  15. Mössbauer spectroscopy and crystal chemistry of natural Fe-Ti garnets.

    Schwartz, Kenneth BruceMassachusetts Institute of Technology1977

    Thesis. 1977. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.

    mit Repository record

  16. (Na,K) Aluminosilicate Hollandites: Structures, Crystal Chemistry, and High-pressure Behaviour

    Liu, JunUniversität Bayreuth

    … the c axis. Structural refinements of single-crystal data collected for KAlSi3O8 and K0.8Na0.2AlSi3O8 hollandites are consistent with Si and Al disorder among the octahedral sites. The major difference between the KAlSi3O8 hollandite end-member and the K0.8Na0.2AlSi3O8 sample is the presence …

    bayreuth Repository record

  17. New Developments in the Crystal Chemistry of Selected Borophosphates and Phosphates

    Menezes, Prashanth W.Technische Universität Dresden

    … contributions to borophosphate structural chemistry. The mild hydrothermal method was employed for the syntheses. During the investigation of borophosphates containing alkali–metals and scandium, the following three compounds were prepared and structurally characterized: MISc[BP2O8(OH)] (MI …

    qucosa-diss

  18. High temperature crystal chemistry of hydrous Mg- and Fe-rich cordierites

    Hochella, Michael F. Jr.Virginia Tech1977

    Structural refinements have been completed using data recorded for a Mg-rich cordierite at 24°C, 375°C, 775°C and 24°C (after heating to 775°C) and for an Fe-rich cordierite at 24°C and 375°C. The mean T-0 bond lengths in both cordierites remain unchanged but the mean octahedral bonds (M-0) …

    vt Repository record

  19. Some Aspects of the Crystal Chemistry of Perovskites under High Pressures

    Wang, DiVirginia Tech2012

    This thesis makes contributions to the methodology of quantitative description of the tilting systems of perovskite structures and theoretical analysis of high-pressure phase transitions of representative perovskites. Chapter 1 and 2 introduce the perovskite structures, tilting classification and …

    vt Repository record

  20. Navigating the Intermetallic Landscape: From Quasicrystal Approximants to High Pressure Crystal Chemistry

    Arrieta, Roy ApolinarUniversity of Houston2024

    … inorganic solids. Here, we explored the complex crystal chemistry enabled by incorporating Au in the presence of electropositive (rare earth and alkali metals) and main group element systems revealing a series of compounds including Zintl-like structures, Frank-Kasper phases, interstitial …

    houston Repository record

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