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A multi-domain gem-grade Brazilian apatite

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : A multi-domain gem-grade Brazilian apatite
นักวิจัย : Baikie, Tom , Schreyer, Martin K. , Wong, Chui Ling , Pramana, Stevin S. , Klooster, Wim T. , Ferraris, Cristiano , McIntyre, Garry J. , White, Timothy John
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Baikie, T., Schreyer, M. K., Wong, C. L., Pramana, S. S., Klooster, W. T., Ferraris, C., et al. (2012). A multi-domain gem-grade Brazilian apatite. American Mineralogist, 97(10), 1574-1581. , 0003-004X , http://hdl.handle.net/10220/12451 , http://dx.doi.org/10.2138/am.2012.4069
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : American mineralogist
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

A gem-grade apatite from Brazil of general composition (Ca,Na)10[(P,Si,S)O4]6(F,Cl,OH)2 has been studied using single-crystal X-ray and neutron diffraction together with synchrotron powder X-ray diffraction. Earlier electron microscopy studies had shown the nominally single-phase apatite contains an abundant fluorapatite (F-Ap) host, together with chloro-hydroxylapatites (Cl/OH-Ap) guest phases that encapsulate hydroxylellestadite (OH-El) nanocrystals. While the latter features appear as small (200–400 nm) chemically distinct regions by transmission electron microscopy, and can be identified as separate phases by synchrotron powder X-ray diffraction, these could not be detected by single-crystal X-ray and neutron analysis. The observations using neutron, X-ray and electron probes are however consistent and complementary. After refinement in the space group P63/m the tunnel anions F− are fixed at z = ¼ along <001>, while the anions Cl− and OH− are disordered, with the suggestion that O-H···O-H··· hydrogen-bonded chains form in localized regions, such that no net poling results. The major cations are located in the 4f AFO6 metaprism (Ca+Na), 6h ATO6X tunnel site (Ca only), and 6h BO4 tetrahedron (P+Si+S). The structural intricacy of this gem stone provides further evidence that apatite microstructures display a nano-phase separation that is generally unrecognized, with the implication that such complexity may impact upon the functionality of technological analogues.

บรรณานุกรม :
Baikie, Tom , Schreyer, Martin K. , Wong, Chui Ling , Pramana, Stevin S. , Klooster, Wim T. , Ferraris, Cristiano , McIntyre, Garry J. , White, Timothy John . (2555). A multi-domain gem-grade Brazilian apatite.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Baikie, Tom , Schreyer, Martin K. , Wong, Chui Ling , Pramana, Stevin S. , Klooster, Wim T. , Ferraris, Cristiano , McIntyre, Garry J. , White, Timothy John . 2555. "A multi-domain gem-grade Brazilian apatite".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Baikie, Tom , Schreyer, Martin K. , Wong, Chui Ling , Pramana, Stevin S. , Klooster, Wim T. , Ferraris, Cristiano , McIntyre, Garry J. , White, Timothy John . "A multi-domain gem-grade Brazilian apatite."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Baikie, Tom , Schreyer, Martin K. , Wong, Chui Ling , Pramana, Stevin S. , Klooster, Wim T. , Ferraris, Cristiano , McIntyre, Garry J. , White, Timothy John . A multi-domain gem-grade Brazilian apatite. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.