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    Wang, Nan Liu, Cong Wang, Yibin Cheng, Jingzhen Gong, Jianzhang and Zhou, Huanfu 2016. Microwave dielectric properties and compatibility with silver electrode of novel low-fired Ba 4 CuTi 11 O 27 ceramic. Ceramics International, Vol. 42, Issue. 14, p. 15855.
    Zhou, Huanfu Miao, Yanbing Xu, Jungu Gong, Jianzhang Chen, Xiuli and Fang, Liang 2015. Novel middle permittivity ceramic Ba4CoTi11O27: Sintering characteristic, cations distribution, crystal structure and microwave dielectric properties. Ceramics International, Vol. 41, Issue. 3, p. 5191.
    Chen, Xiuli Zhou, Huanfu Fang, Liang Liu, Laijun Li, Changda Guo, Ruli and Wang, Hong 2010. Low-temperature sintering and compatibility with silver electrode of Ba4MgTi11O27 microwave dielectric ceramic. Materials Research Bulletin, Vol. 45, Issue. 10, p. 1509.
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Crystal structure and reference X-ray pattern of Ba4Ti10Al2O27

  • J. A. Kaduk (a1), B. H. Toby (a2), W. Wong-Ng (a2) and W. Greenwood (a3)
Abstract

The crystal structure of Ba4Ti10Al2O27 has been refined in a joint Rietveld refinement using neutron and X-ray powder data. The compound crystallizes in the monoclinic space group C2/m, with a=19.7057(3), b=11.3575(2), c=9.8318(2) Å, β=109.218(1)°, and V=2077.81(5) Å3. It is isostructural to Ba4Ti10Fe2O27 and Ba4Ti11ZnO27, and consists of a complex network of corner- and edge-sharing Ti/Al octahedra. The structure can best be described based on close-packed O/Ba-O layers in an 8-layer (8L) chhcchhc sequence. Out of a total of ten Ti/Al sites, Al was found to substitute for Ti mainly in four sites, and the remaining six sites were predominantly occupied by Ti. The unit cell contents derived from the refined site occupancies are Ba16Ti40.48Al7.52O108, essentially identical to the expected Ba16Ti40Al8O108. A reference diffraction pattern of this phase is also reported.

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COPYRIGHT: © Cambridge University Press 1998
References
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Brown, I. D., and Altermatt, D. (1985). “Bond Valence Parameters Obtained from a Systematic Analysis of the Inorganic Crystal Structure Database,” Acta Crystallogr., Sect. B: Struct. Sci. B41, 244–247.
Fischer, R. X. (1985). “STRUPLO84, A Fortran Program for Crystal Structure Illustrations in Polyhedral Representation,” J. Appl. Crystallogr. 18, 258–262.
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Lindsay, C. G., Rawn, C. J., and Roth, R. S. (1994). “Powder X-ray Diffraction Data for Ba 4ZnTi 11O 27 and Ba 2ZnTi 5O 13,” Powder Diffr. 9, 56–62.
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Rietveld, H. M. (1969). “A Profile Refinement Method for Nuclear and Magnetic Structures,” J. Appl. Crystallogr. 2, 65–71.
Roth, R. S., Rawn, C. J., Lindsay, C. G., and Wong-Ng, W. (1993). “Phase Equilibria and Crystal Chemistry of the Binary and Ternary Barium Polytitanates and Crystallography of the Barium Zinc Polytitanates,” J. Solid State Chem. 104, 99–118.
Schmachtel, J., and Müller-Buschbaum, H. (1981). “Ein Neues Quaternares Oxotitanat: Ba 4Ti 10Al 2O 27,” Z. Anorg. Allg. Chem. 472, 89–94.
Vanderah, T. A., Wong-Ng, W., Huang, Q., Roth, R. S., Geyer, R. G., and Goldfarb, R. B. (1997). “Crystal Structures and Properties of Ba 4Fe 2Ti 10O 27 and Ba 3Fe 10TiO 20,” J. Phys. Chem. Solids 58, 1403–1415.
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Powder Diffraction
  • ISSN: 0885-7156
  • EISSN: 1945-7413
  • URL: /core/journals/powder-diffraction
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