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024 7 _ |a 10.1111/jace.15988
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024 7 _ |a 1551-2916
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037 _ _ |a FZJ-2019-03313
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100 1 _ |a Naqash, Sahir
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245 _ _ |a Microstructure-conductivity relationship of Na 3 Zr 2 (SiO 4 ) 2 (PO 4 ) ceramics
260 _ _ |a Westerville, Ohio
|c 2019
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520 _ _ |a The ionic conductivity of solid electrolytes is dependent on synthesis and processing conditions, ie, powder properties, shaping parameters, sintering time (ts), and sintering temperature (Ts). In this study, Na3Zr2(SiO4)2(PO4) was sintered at 1200 and 1250°C for 0‐10 hours and its microstructure and electrical performance were investigated by means of scanning electron microscopy and impedance spectroscopy. After sintering under all conditions, the sodium super‐ionic conductor‐type structure was formed along with ZrO2 as a secondary phase. The microstructure investigation revealed a bimodal particle size distribution and grain growth at both Ts. The density of samples increased from 60% at 1200°C for 0 hours to 93% at 1250°C for 10 hours. The ionic conductivity of the samples increased with ts due to densification and grain growth, ranging from 0.13 to 0.71 mS/cm, respectively. The corresponding equivalent circuit fitting for the impedance spectra revealed that grain boundary resistance is the prime factor contributing to the changing conductivity after sintering. The activation energy of the bulk conductivity (Ea,bulk) remained almost constant (0.26 eV) whereas the activation energy of the total conductivity (Ea) exhibited a decreasing trend from 0.37 to 0.30 eV for the samples with ts = 0 and 10 hours, respectively—both sintered at 1250°C. In this study, the control of the grain boundaries improved the electrical conductivity by a factor of 6.
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700 1 _ |a Sebold, Doris
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700 1 _ |a Tietz, Frank
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700 1 _ |a Guillon, Olivier
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773 _ _ |a 10.1111/jace.15988
|g Vol. 102, no. 3, p. 1057 - 1070
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|t Journal of the American Ceramic Society
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856 4 _ |y Published on 2018-08-13. Available in OpenAccess from 2019-08-13.
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856 4 _ |y Published on 2018-08-13. Available in OpenAccess from 2019-08-13.
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