Microstructural, electrical, and mechanical characterization of Bi2Cu0.1V0.9O5.35 (BICUVOX) ceramics fabricated from co-precipitated precursor powders

作者：Sabolsky Edward M^*; Razmyar Soheil; Sabolsky Katarzyna

来源：Journal of Materials Science, 2013, 48(2): 733-743.

DOI：10.1007/s10853-012-6787-2

Copper-doped bismuth vanadate (Bi2Cu0.1V0.9O5.35, BICUVOX) was synthesized by a co-precipitation process which resulted in a homogenous, fine-grained powder with an average particle size of similar to 0.45 mu m. The consolidated BICUVOX powder was sintered at temperatures between 625 and 800 degrees C for 0-8 h in air. The correlation between the thermal processing schedule and the final microstructure were completed for all conditions through stereological analysis of the resultant cross-sectional scanning electron microscope images. From this work, the sintering schedule of 675 degrees C for 1 h resulted in acquiring a BICUVOX ceramic microstructure that displayed similar to 97 % relative density with an average grain size of similar to 1.29 mu m. This processing condition was similar to 75-125 degrees C lower than typical sintering temperatures for the same density, and resulted in a final grain size that is similar to 5-10 mu m smaller in size. The four-point conductivity testing of the BICUVOX ceramics in air showed values of similar to 0.003-0.007 and similar to 0.07-0.12 S/m at 300 degrees C and 500 degrees C, respectively, depending upon the thermal processing schedule. The average flexure strength of the same BICUVOX membrane was measured using a ring-on-ring configuration, and this measurement showed flexural strengths as high as 159.3 MPa. This strength is similar to 92 % greater than previously reported values for BICUVOX membranes.

• 出版日期2013-1