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Effect of V2O5 doping on the microstructure and local composition of textured Sr0.4Ba0.6Nb2O6 ceramics

  • Xian-Hao Wang , Hui Gu , Qing-Wei Huang and Li-Ping You
Published/Copyright: May 23, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 98 Issue 3

Abstract

A comparison of phases and the microstructures of textured Sr0.4Ba0.6Nb2O6 ceramics without and with V2O5 addition was carried out using transmission and analytical electron microscopy. The dopant was not found in Sr0.4Ba0.6Nb2O6 grains but in the inter-granular regions, including both grain boundary and second phase. Grain boundaries in the sample without V2O5 are clean, but those in the V2O5-doped sample exhibit a variety of structures, with and without an amorphous film of variable thickness. In general the vanadium excess follows the same trend of film width, while the Sr excess is generally negative and the Ba excess is positive, suggesting that the amorphous films at grain boundaries are rich in V and Ba and deficient in Nb and Sr. The second phase was determined as Ba3V4O13 phase containing small amounts of Sr and Nb. Such V- and Ba-rich inter-granular liquids promoted the densification and texturing, and affected the dielectric constant at low frequency but not the Curie temperature.

Keywords: Strontium barium niobate; Liquid-phase sintering; Textured microstructure; Grain boundary film; Analytical electron microscopy
* Correspondence address, Prof. H. Gu State Key Lab of High Performance Ceramics andSuperfine Microstructures Shanghai Institute of Ceramics Chinese Academy of Sciences Dingxi Road 1295, Shanghai 2005, P. R. of China Tel.: +86 21 5241 2318 Fax: +86 21 5241 3122 E-mail:

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Received: 2006-8-29
Accepted: 2006-12-12
Published Online: 2013-05-23
Published in Print: 2007-03-01

© 2007, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101455
Keywords for this article
Strontium barium niobate; Liquid-phase sintering; Textured microstructure; Grain boundary film; Analytical electron microscopy

Articles in the same Issue

  1. Contents
  2. Contents
  3. Basic
  4. Texture and microstructure evolution of ECAP processed AlMg1Mn0.14 alloy
  5. Modelling grain refinement in fcc metals during equal-channel angular pressing by route “C”
  6. Fabrication of high strength nanostructured aluminium alloys by hydrostatic extrusion
  7. Comparison of the plastic strain distribution during equal-channel angular pressing (ECAP) using 2D and 3D FEM modeling
  8. Deformation twins in ultrafine grained commercial aluminum
  9. Compressive behaviour of ultrafine-grained AA6063T6 over a wide range of strains and strain rates
  10. Grain refinement response during twist extrusion of an Al-0.13% Mg alloy
  11. Preparation of NiO–LiFeO2 solid solutions: the role of mechanical and thermal treatments
  12. Applied
  13. Fatigue strength and fracture behavior of steels with and without interstitial carbon at room temperature in air
  14. The influence of Nd on the corrosion behavior of electroless-deposited Fe–P
  15. Time-dependent directional solidification of binary Al–Cu alloys in the initial transient
  16. Effect of V2O5 doping on the microstructure and local composition of textured Sr0.4Ba0.6Nb2O6 ceramics
  17. Microstructure and mechanical properties of AZ91D alloy prepared by a semi-solid diecasting process
  18. Development of SMD 32.768 kHz tuning fork type crystals
  19. Notifications
  20. DGM News
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