Abstract
The formation of extended planar defects in minerals such as olivine is related to high point defect concentration and can be driven by large gradients in chemical potential, where the energy of the system is lowered by the ordering of defects along specific planes in the crystal. The presence of extended defects has the potential to create the (apparently) anomalous ionic diffusion in olivine as reported recently (Spandler and O’Neill in Contrib Mineral Petrol 159(6):791–818, 2010). High-resolution transmission electron microscopy and energy-filtered imaging were done using experimental samples designed to examine the impact of a TiO2 and f O2 on the potential to form such defects in ferromagnesian olivine. Doped basalt (5 wt% TiO2)–olivine reaction couple experiments were run at 1 atm and 1,310 and 1,410 °C for 50 h at various f O2, ranging from 102 below to 102 above the quartz–fayalite–magnetite buffer. Our results show that extended planar defects in olivine, parallel to {101}ol and occurring in ordered “clusters” with a prolate spheroid geometry ~5–25 nm across and extending up to 150 nm into the olivine, are present near the olivine–glass interfaces in all of our experimental high-TiO2 basalt–olivine samples. Increased Ti content in the olivine is associated with the defects; ordering of Ti4+ and octahedral site vacancies leads to a two- or three-layer superstructure in the olivine. Defect nucleation and growth is driven by the large TiO2 chemical potential gradient across the phase boundary at the start of the experiments, which provides access to microstructures not otherwise present.
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Notes
Kröger–Vink notation: subscripts refer to lattice sites and the superscripts refer to defect charge, with a dot noting a single positive charge, a prime a single negative charge and ‘×’ as neutral. \(V_{\text{Mg}}^{\prime \prime }\), for example, is a vacancy on an octahedral Mg2+ site that has a (real, based on a local distortion of the valence band) 2− charge.
Per Walker et al. (2009), the defect reaction \({\text{Mg}}_{\text{Mg}}^{ \times } = {\text{Mg}}_{\text{i}}^{ \cdot \cdot } + V_{\text{Mg}}^{\prime \prime }\) has a Δ r G F º = 6.73 eV; thus K eq,1,890ºC = 2.1 × 10−16 and, assuming a Mg–Frenkel intrinsic disorder, the concentration (per molecule of forsterite) of \(V_{\text{Mg}}^{\prime \prime }\) = (K eq,1,890ºC)1/2 = 1.4 × 10−8.
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Acknowledgments
We thank Cameron Myers for assistance with lab work. This study made use of the Electron Microscope Facility at Brown University, supported by MRSEC/National Science Foundation under award number DMR-0079964 and by MURI2000/AFOSR under award number F49620-00-1-0331, with technical support provided by Tony McCormick and, too, of the MRSEC Shared Experimental Facilities at Massachusetts Institute of Technology, supported by the National Science Foundation under award number DMR-08-19762, with technical support provided by Dr. Yong Chen. The manuscript was improved by discussions with Paul Voyles (University of Wisconsin–Madison) and, in revision, by pointed and helpful comments from Ralf Dohmen and an anonymous reviewer. The study was supported financially, in part, by the Brown/MIT National Aeronautics and Space Agency Lunar Science Institute and by the National Science Foundation Program in Petrology and Geochemistry (EAR-1144668 to RFC).
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Communicated by Hans Keppler.
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Burgess, K.D., Cooper, R.F. Extended planar defects and the rapid incorporation of Ti4+ into olivine. Contrib Mineral Petrol 166, 1223–1233 (2013). https://doi.org/10.1007/s00410-013-0918-x
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DOI: https://doi.org/10.1007/s00410-013-0918-x