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Structure and chemistry of (111) twin boundaries in MgAl2O4 spinel crystals from Mogok

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Abstract

The atomic scale structure and chemistry of (111) twins in MgAl2O4 spinel crystals from the Pinpyit locality near Mogok (Myanmar, formerly Burma) were analysed using complementary methods of transmission electron microscopy (TEM). To obtain a three-dimensional information on the atomic structure, the twin boundaries were investigated in crystallographic projections \( [\ifmmode\expandafter\bar\else\expandafter\=\fi{1}10] \) and \( [11\ifmmode\expandafter\bar\else\expandafter\=\fi{2}]. \) Using conventional electron diffraction and high-resolution TEM (HRTEM) analysis we have shown that (111) twins in spinel can be crystallographically described by 180° rotation of the oxygen sublattice normal to the twin composition plane. This operation generates a local hcp stacking in otherwise ccp lattice and maintains a regular sequence of kagome and mixed layers. In addition to rotation, no other translations are present in (111) twins in these spinel crystals. Chemical analysis of the twin boundary was performed by energy-dispersive X-ray spectroscopy (EDS) using a variable beam diameter (VBD) technique, which is perfectly suited for analysing chemical composition of twin boundaries on a sub-nm scale. The VBD/EDS measurements indicated that (111) twin boundary in spinel is Mg-deficient. Quantitative analyses of HRTEM (phase contrast) and HAADF-STEM (Z-contrast) images of (111) twin boundary have confirmed that Mg2+ ions are replaced with Be2+ ions in boundary tetrahedral sites. The Be-rich twin boundary structure is closely related to BeAl2O4 (chrysoberyl) and BeMg3Al8O16 (taaffeite) group of intermediate polysomatic minerals. Based on these results, we conclude that the formation of (111) twins in spinel is a preparatory stage of polytype/polysome formation (taaffeite) and is a result of thermodynamically favourable formation of hcp stacking due to Be incorporation on the {111} planes of the spinel structure in the nucleation stage of crystal growth. The twin structure grows as long as the surrounding geochemical conditions allow its formation. The incorporation of Be induces a 2D-anisotropy and exaggerated growth of the crystal along the (111) twin boundary.

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References

  • Abduriyim A, Kitamura M (2002) Growth morphology and change in growth conditions of a spinel-twinned natural diamond. J Cryst Growth 237–239:1286–1290

    Article  Google Scholar 

  • Aminoff G, Broomé G (1931) Strukturtheoretische studien über zwillinge I. Zeitschrift für Kristalogr 80:355–376

    Google Scholar 

  • Anderson BW, Payne CJ, Claringbull GF, Hey MH (1951) Taaffeite, a new beryllium mineral, found as cut gemstone. Mineral Mag 29:765–772

    Article  Google Scholar 

  • Armbruster T (2002) Revised nomenclature of högbomite, nigerite, and taaffeite minerals. Eur J Mineral 14:389–395

    Article  Google Scholar 

  • Boese MU (2004) Herstellung und charakterisierung epitaktischer Spinellbeschichtungen auf Korund und Analyse der Grenzflächen (in German). PhD Thesis, Mathematisch-Naturwissenschaflichen Fakultät der Rheinischen Friedrich-Willhelms-Universität Bonn

  • Bruley J, Tseng MW, Williams DB (1995) Spectrum-line profile analysis of a magnesium aluminate spinel/sapphire interface. Microsc Microanal Microstruct 6:1–18

    Article  Google Scholar 

  • Carter CB, Elgat Z, Shaw TM (1987) Twin boundaries parallel to the common {111} plane in spinel. Philos Mag A 55:1–19

    Google Scholar 

  • Devouard B, Pósfai M, Hua X, Bazylinski DA, Frankel RB, Buseck PR (1998) Magnetite from magnetotactic bacteria: size distributions and twinning. Am Mineral 83:1387–1398

    Google Scholar 

  • Farrell EF, Fan JH, Newnham RE (1963) Refinement of the chrysoberyl structure. Am Mineral 48:804–810

    Google Scholar 

  • Fregola RA, Melone N, Scandale E (2005) X-ray diffraction topographic study of twinning and growth of natural spinels. Eur J Mineral 17:761–768

    Article  Google Scholar 

  • Hartman and Perdok (1955) On the relations between structure and morphology of crystals. I, II and III. Acta Cryst 8:49, 521 and 525

    Google Scholar 

  • Hornstra J (1960) Dislocations, stacking faults and twins in the spinel structure. J Phys Chem Solids 15:311–323

    Article  Google Scholar 

  • Hughes RW (1997) Ruby and sapphire boulder (CO) RWH, Ch.12 Burma, p 512

  • Iida S (1957) Layer structures of magnetic oxides. J Phys Soc Jpn 12:222–233

    Article  Google Scholar 

  • Iyer LAN (1953) The geology and gem-stones of the mogok stone tract, Burma. Mem Geol Surv India 82:100

    Google Scholar 

  • Kauffmann Y, Rečnik A, Kaplan WD (2005) The accuracy of quantitative image matching for HRTEM applications. Mater Charact 54:194–205

    Google Scholar 

  • Kiefer B, Stixrude L, Wentzcovitch R (1999) Normal and inverse ringwoodite at high pressures. Am Mineral 84:288–293

    Google Scholar 

  • Moor R, Oberholzer WF, Gübelin E (1981) Taprobanite, a new mineral of the taaffeite group. Schweiz Mineral Petrogr Mitt 61:13–21

    Google Scholar 

  • Nuber B, Schmetzer K (1983) Crystal structure of ternary Be–Mg–Al oxides: taaffeite BeMg3Al8O16 and musgravite BeMg2Al6O12. N Jb Miner Mh 9:393–402

    Google Scholar 

  • Pauling L (1940) The nature of the chemical bond, 2nd edn. Cornell University Press, Ithaca

    Google Scholar 

  • Peng CC, Wang KJ (1963) The discovery of an eight-layer close-packed structure—crystal structure analysis of mineral taaffeite (in Russian). Scientia Sinica 12:276–278

    Google Scholar 

  • Rečnik A, Bruley J, Mader W, Kolar D, Rühle M (1994) Structural and spectroscopic investigation of (111) twins in barium titanate. Philos Mag B 70:1021–1034

    Google Scholar 

  • Rečnik A, Čeh M, Kolar D (2001a) Polytype induced exaggerated grain growth in ceramics. J Eur Ceram Soc 21:2117–2121

    Article  Google Scholar 

  • Rečnik A, Daneu N, Walther T, Mader W (2001b) Structure and chemistry of basal-plane inversion boundaries in antimony oxide-doped zinc oxide. J Am Ceram Soc 84:2657–2668

    Article  Google Scholar 

  • Rečnik A, Moebus G, Šturm S (2005) IMAGE-WARP: a real-space restoration method for high-resolution STEM images using quantitative HRTEM analysis. Ultramicroscopy 103:285–301

    Article  Google Scholar 

  • Schmetzer K (1983) Crystal chemistry of natural Be–Mg–Al–oxides: taaffeite, taprobanite, musgravite. Neues Jahrbuch Miner Abh 146:15–28

    Google Scholar 

  • Sickafus KE, Willis JM, Grimes NW (1999) Structure of spinel. J Am Ceram Soc 82:3279–3292

    Article  Google Scholar 

  • Stadelmann PA (1987) EMS—a software package for electron diffraction analysis and HREM image simulation in materials science. Ultramicroscopy 21:131–145

    Article  Google Scholar 

  • Tabata H, Ishii E (1980) Spinel twin formation in flux grown MgAl2O4 crystals. J Cryst Growth 49:753–756

    Article  Google Scholar 

  • Tabata H, Ishii E, Okuda H (1981) Cation antiphase boundaries in ionic crystals based on anion close packing. J Cryst Growth 52:956–962

    Article  Google Scholar 

  • Walther T, Daneu N, Rečnik A (2004) A new method to measure small amounts of solute atoms on planar defects and application to inversion domain boundaries in doped zinc oxide. Interface Sci 12:267–275

    Article  Google Scholar 

  • Watanabe K, Yamazaki T, Hashimoto I, Shiojiri M (2001) Atomic-resolution annular dark-field STEM image calculations. Phys Rev B 64:115432

    Article  Google Scholar 

  • Yamazaki T, Nakanishi N, Rečnik A, Kawasaki M, Watanabe K, Čeh M, Shiojiri M (2004) Quantitative high-resolution HAADF-STEM analysis of inversion boundaries in Sb2O3-doped zinc oxide. Ultramicroscopy 98:305–316

    Article  Google Scholar 

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Acknowledgments

The financial support of the Slovenian Ministry for Science under the project no. Z1-6493-1555-04 is gratefully acknowledged.

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Authors and Affiliations

  1. Department for Nanostructured Materials, Jožef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia

    Nina Daneu & Aleksander Rečnik

  2. Department of Physics, Tokyo University of Science, Tokyo, Japan

    Takashi Yamazaki

  3. Department of Geology, Faculty for Natural Sciences and Technology, University of Ljubljana, Ljubljana, Slovenia

    Tadej Dolenec

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  1. Nina Daneu
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  2. Aleksander Rečnik
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  3. Takashi Yamazaki
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  4. Tadej Dolenec
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Correspondence to Nina Daneu.

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Daneu, N., Rečnik, A., Yamazaki, T. et al. Structure and chemistry of (111) twin boundaries in MgAl2O4 spinel crystals from Mogok. Phys Chem Minerals 34, 233–247 (2007). https://doi.org/10.1007/s00269-007-0142-1

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  • DOI: https://doi.org/10.1007/s00269-007-0142-1

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