کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1647006 1517311 2012 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nano-ceria enhancement of Bi2Cu0.1 V0.9O5.35 (BICUVOX) ceramic electrolytes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Nano-ceria enhancement of Bi2Cu0.1 V0.9O5.35 (BICUVOX) ceramic electrolytes
چکیده انگلیسی

Doped nano-ceria particulates ((Ce0.9Gd0.1)O2, GDC) were synthesized by hydrothermal processes and dispersed within a matrix of copper-doped bismuth vanadate (Bi2V0.9Cu0.1O5.35, BICUVOX) powder at levels ranging from 0.2 to 4.0 wt.%. The BICUVOX powder was synthesized by a co-precipitation process which resulted in a homogenous, fine-grained powder with an average particle size of ~ 0.6 μm. The BICUVOX/GDC composite was sintered at temperatures between 675 and 800 °C for 4 h. The incorporation of the nano-GDC into the BICUVOX ceramic was shown to pin grain boundary mobility, which permitted sintering to high densities while retaining finer grain sizes (1–4 μm in average size). The low levels of nano-GDC additions were shown to decrease the total conductivity of the BICUVOX electrolytes. Four-point conductivity testing of the BICUVOX/GDC (0.6 wt.%) composite in air showed values of ~ 0.008 S/cm and ~ 0.06 S/m at 300 °C and 500 °C, respectively. The average flexure strength of the same composite membrane was measured using a ring-on-ring configuration, and this measurement showed flexural strengths as high as 134.2 MPa. This strength is ~ 60% greater than previously reported values for BICUVOX membranes.


► Nano-CeO2 particles incorporated into Bi-based electrolytes.
► Intergranular nano-CeO2 pinned Bi-electrolyte grain boundaries during sintering.
► High densities (> 99%) and low grain size (~ 1 μm) achieved.
► Restricted grain size resulted in sixty percent increase in flexural strength.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 76, 1 June 2012, Pages 47–50
نویسندگان
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