Synthesis and ion conductivity of (Bi2O3)0.75(Dy2O3)0.25 ceramics with grain sizes from the nano to the micro scale

Li, Rong; Quiang, Zhen,; Drache, M.; Rubbens, Annick; Estournès, Claude; Vannier, Rose‐Noëlle

doi:10.1016/j.ssi.2011.05.012

Cited by 22 publications

(20 citation statements)

References 36 publications

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“…(b)]. This last model has been applied for other ceramics such as strontium titanate, mullite‐type Bi 2 Al 4 O, and (BiO 3 ) 0.75 (Dy 2 O 3 ) 0.25 …”

Section: Resultsmentioning

confidence: 83%

“…The angle β is also given in Table in degrees. Its value is small and almost constant (9° ≤ β ≤14°) in the whole temperature range 300°C–1400°C indicating that one circle model could be used for the analysis …”

Section: Resultsmentioning

confidence: 88%

“…In this study, it is very unlikely that the two processes (grain boundary and grain interior) overlap in the very broad temperature range 300°C–1400°C without any splitting. Li et al . also obtained one arc and a spike in the (BiO 3 ) 0.75 (Dy 2 O 3 ) 0.25 ceramics in the temperature range 200°C–500°C for different grain size ranging from 20 nm to 2 μm.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, it is very unlikely that the two processes (grain boundary and grain interior) overlap in the very broad temperature range 300°C-1400°C without any splitting. Li et al 21 To explain the electrical behavior of our mullite ceramic, we suggest a model based on three parallel elements R b , R gb , and CPE in series with a (R ep //CPE ep ) element to take into account the electrode polarization phenomena [ Fig. 5(b)].…”

Section: Resultsmentioning

confidence: 99%

“…This last model has been applied for other ceramics such as strontium titanate, 22 mullite-type Bi 2 Al 4 O, 23 and (BiO 3 ) 0.75 (-Dy 2 O 3 ) 0.25 . 21 In the BLM Model, the dc-electrical conductivities of the bulk r b , the grain boundaries r gb and the total conductivity r tot are deduced from the intercepts of the curve to the real axis:…”

Section: Resultsmentioning

confidence: 99%

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Electrical Conductivity of Mullite Ceramics

et al. 2014

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The electrical conductivity of a lab‐produced homogeneous mullite ceramic sintered at 1625°C for 10 h with low porosity was measured by impedance spectroscopy in the 0.01 Hz to 1MHz frequency range at temperatures between 300°C and 1400°C in air. The electrical conductivity of the mullite ceramic is low at 300°C (≈0.5 × 10−9 Scm−1), typical for a ceramic insulator. Up to ≈ 800°C, the conductivity only slightly increases (≈0.5 × 10−6 Scm−1 at 800°C) corresponding to a relatively low activation energy (0.68eV) of the process. Above ≈ 800°C, the temperature‐dependent increase in the electrical conductivity is higher (≈10−5 Scm−1 at 1400°C), which goes along with a higher activation energy (1.14 eV). The electrical conductivity of the mullite ceramic and its temperature‐dependence are compared with prior studies. The conductivity of polycrystalline mullite is found to lie in‐between those of the strong insulator α‐alumina and the excellent ion conductor Y‐doped zirconia. The electrical conductivity of the mullite ceramic in the low‐temperature field (< ≈800°C) is approximately one order of magnitude higher than that of the mullite single crystals. This difference is essentially attributed to electronic grain‐boundary conductivity in the polycrystalline ceramic material. The electronic grain‐boundary conductivity may be triggered by defects at grain boundaries. At high temperatures, above ≈ 800°C, and up to 1400°C gradually increasing ionic oxygen conductivity dominates.

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“…(b)]. This last model has been applied for other ceramics such as strontium titanate, mullite‐type Bi 2 Al 4 O, and (BiO 3 ) 0.75 (Dy 2 O 3 ) 0.25 …”

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%