Journal of Materials Science

, Volume 46, Issue 23, pp 7377–7383 | Cite as

An experimental refinement of solid–solution relationship in Ca-α-Sialon ceramics by analytical electron microscopy

  • Bo Zhu
  • Hui Gu
  • Pei-ling Wang


Local dopant compositions within individual α-Sialon grains were measured by analytical electron microscopy (AEM) in hot-pressed Ca x Si12−3x Al3x O x N16−x (x = 0.3–1.4) ceramics. The reduction of local x values from the nominal dopant compositions is about 40% in general, and it reaches 60% for the end member (x = 1.4) which contains inclusions of AlN-based 21R phase. This results exhibit stronger departures from x than the previous report of 30% dopants missing in α-Sialon phase by electron probe micro-analysis (EPMA) [J Eur Ceram Soc 19:1637, 1999]. Amorphous films of ~1 nm thick were commonly found at grain boundaries (GBs), which could only take a small fraction of undetected dopants while the film composition exhibits a quite different behavior. The general presence of GB films can rationalize the discrepancy between AEM and EPMA results by their differences in probe size and detection geometry, while the much larger gap in the end member suggests the existence of Ca-rich glasses in the intergranular regions. By excluding this end member, a linear relation between dopant solution and lattice expansion is restored in α-Sialon structure, which leads to 20 and 80% increases of the expansion coefficients from those given in the previous and original reports, respectively. This study not only demonstrated the necessity of solubility study in ceramics by AEM refinement, but also opens a new front to correlate the solution behavior with the intergranular glass/amorphous structures, both were regarded so far as largely independent.


Grain Boundary Analytical Electron Microscopy Solution Level Dopant Solution Thin Transmission Electron Microscopy Foil 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This study is financially supported by the Natural Science Foundation Committee (Grant No. 50525205). The authors would like to thank Dr. Chen Zhang for materials processing, Ms. Ying-Xin Jia for powder XRD analysis, and Dr. Peng-Xiang Qian for assistance in the preparation of figures.


  1. 1.
    Hampshire S, Park HK, Thompson DP, Jack KH (1978) Nature 274:880CrossRefGoogle Scholar
  2. 2.
    Hewett CL, Cheng YB, Muddle BC, Trigg MB (1998) J Am Ceram Soc 81:1781CrossRefGoogle Scholar
  3. 3.
    Oyama Y, Kamigaito O (1971) Jpn J Appl Phys 10:1637CrossRefGoogle Scholar
  4. 4.
    Wang PL, Zhang C, Sun WY, Yan DS (1999) J Eur Ceram Soc 19:553CrossRefGoogle Scholar
  5. 5.
    Zhu B, Gu H, Holzer S, Hoffmann MJ (2006) Scr Mater 54:1469CrossRefGoogle Scholar
  6. 6.
    Huang ZK, Tien TY, Yan DS (1986) J Am Ceram Soc 69:C241CrossRefGoogle Scholar
  7. 7.
    Wang PL, Sun WY, Yen TS (1994) Eur J Solid State Inorg Chem 31:93Google Scholar
  8. 8.
    Mandal H, Camscu N, Thompson DP (1995) J Mater Sci 30:5901. doi: 10.1007/BF01151503 CrossRefGoogle Scholar
  9. 9.
    Huang ZK, Sun WY, Yan DS (1984) J Mater Sci Lett 4:255CrossRefGoogle Scholar
  10. 10.
    Wang PL, Jia YX, Zhang C, Sun WY (1999) J Inorg Mater (in Chinese) 14:763Google Scholar
  11. 11.
    Chi MF, Gu H, Wang X, Wang PL (2003) J Am Ceram Soc 86:1953CrossRefGoogle Scholar
  12. 12.
    Chi MF, Gu H, Qian PX, Wang X, Wang PL (2005) Int J Mater Res 96:486Google Scholar
  13. 13.
    Fang PA, Gu H, Van Landuyt J, Vleugels J, Vander Biest O, Wang PL (2005) J Am Ceram Soc 88:1929CrossRefGoogle Scholar
  14. 14.
    Hu JF, Gu H, Chen ZM, Tan SH, Jiang DL, Rühle M (2007) Acta Mater 55:5666CrossRefGoogle Scholar
  15. 15.
    Gu H, Cannon RM, Rühle M (1998) J Mater Res 13:376CrossRefGoogle Scholar
  16. 16.
    Chi MF, Gu H (2004) Interface Sci 12:335CrossRefGoogle Scholar
  17. 17.
    Huang R, Gu H, Zhang JX, Jiang DL (2005) Acta Mater 53:2521CrossRefGoogle Scholar
  18. 18.
    Cliff G, Lorimer GW (1975) J Microsc 103:203CrossRefGoogle Scholar
  19. 19.
    Gu H, Cannon RM, Tanaka I, Rühle M (2006) Mater Sci Eng A 422:51CrossRefGoogle Scholar
  20. 20.
    Gu H, Tanaka I, Cannon RM, Pan X, Rühle M (2010) Int J Mater Res 101:66Google Scholar
  21. 21.
    Van Rutten JWT, Hintzen HT, Metselaar R (1996) J Eur Ceram Soc 16:995CrossRefGoogle Scholar

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© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiChina
  2. 2.Jinma CorpDalianChina

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