Synthesis and characterization of a NaSICON series with general formula Na2.8Zr2−ySi1.8−4yP1.2+4yO12 (0⩽y⩽0.45)

Essoumhi, A.; Favotto, C.; Mansori, Mohammed; Satre, P.

doi:10.1016/j.jssc.2004.09.026

Cited by 19 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to conventional solid-state reaction, there are a number of synthesis methods to form Na 3 Zr 2 Si 2 PO 12 . The sol-gel route is much more complex, and harder to optimise, but requires lower sinter temperatures than the solid-state route [10,[24][25][26][27][28][29], the key benefit being production of a purer phase. The high temperatures in solid-state processing are associated with thermal decomposition and ZrO 2 contamination, with segregation of zirconia at the grain boundary resulting in a reduction in ionic conductivity [23].…”

Section: Introductionmentioning

confidence: 99%

Solid-state synthesis of NASICON (Na3Zr2Si2PO12) using nanoparticle precursors for optimisation of ionic conductivity

et al. 2019

View full text Add to dashboard Cite

In this work, the effect of varying the size of the precursor raw materials SiO 2 and ZrO 2 in the solid-state synthesis of NASICON in the form Na 3 Zr 2 Si 2 PO 12 was studied. Nanoscale and macro-scale precursor materials were selected for comparison purposes, and a range of sintering times were examined (10, 24 and 40 h) at a temperature of 1230°C. Na 3 Zr 2 Si 2 PO 12 pellets produced from nanopowder precursors were found to produce substantially higher ionic conductivities, with improved morphology and higher density than those produced from larger micron-scaled precursors. The nanoparticle precursors were shown to give a maximum ionic conductivity of 1.16 9 10-3 S cm-1 when sintered at 1230°C for 40 h, in the higher range of published solid-state Na 3 Zr 2 Si 2 PO 12 conductivities. The macro-precursors gave lower ionic conductivity of 0.62 9 10-3 S cm-1 under the same processing conditions. Most current authors do not quote or consider the precursor particle size for solid-state synthesis of Na 3 Zr 2 Si 2 PO 12. This study shows the importance of precursor powder particle size in the microstructure and performance of Na 3 Zr 2 Si 2 PO 12 during solid-state synthesis and offers a route to improved predictability and consistency of the manufacturing process.

show abstract

Section: Introductionmentioning

confidence: 99%

Solid-state synthesis of NASICON (Na3Zr2Si2PO12) using nanoparticle precursors for optimisation of ionic conductivity

et al. 2019

View full text Add to dashboard Cite

show abstract

“…However, synthesis of single phase NASICON through a solid state reaction technique is difficult due to the presence of ZrO 2 as a secondary phase. In addition to the Na 3 Zr 2 Si 2 PO 12 phase, some Zr deficient compositions (Na 1+x Zr 2−x/3 Si x P 3−x O 12−2x/3 ) have also been synthesized using Na 2 CO 3 , NH 4 H 2 PO 4 , ZrO 2 and SiO 2 as initial ingredients [10]. Dang et al [11] have used different zirconium salts to synthesize NASICON.…”

Section: Introductionmentioning

confidence: 99%

Optimization of High Conducting Na3Zr2Si2PO12 Phase by new Phosphate Salt for Solid Electrolyte

Jha

Pandey

Singh

2016

Silicon

View full text Add to dashboard Cite

A composition of NASICON (Na 3 Zr 2 Si 2 PO 12 ) was synthesized by the solid-state reaction method using a new compound Na 2 HPO 4 2H 2 O. The X-ray diffraction patterns of all samples exhibit monoclinic Na 3 Zr 2 Si 2 PO 12 as a major phase with a very small amount of monoclinicZrO 2 . The maximum relative density (97 %) and maximum conductivity is obtained in the samples sintered at 1200 • C (N3) which is slightly higher than β-Al 2 O 3 . The activation energy is ∼ 0.20 eV for the N3 sample which is lower than for β-Al 2 O 3 . The dilatometeric study and Arrhenius plots confirmed a phase transition of NASICON from monoclinic to rhombohedral. The micro-structural study of the samples done by scanning electron microscopy (SEM) indicated a significant influence of the processing conditions on the microstructures. Raman spectroscopy demonstrated that the sample N3 exhibits minor structural changes compared to other samples.

show abstract

“…These high‐temperature processes, however, are well‐known to produce secondary ZrO 2 phases, ostensibly resulting from the thermal decomposition of NaSICON at elevated temperatures or volatility of Na and P species . As a contaminant phase, ZrO 2 stands to degrade ionic conductivity, introduces mechanical integrity concerns related to volume changes during the tetragonal to monoclinic phase transformation in ZrO 2 , and is associated with the formation of secondary compositional and microstructural defects that degrade the integrity and performance of NaSICON . Historically, the most well‐known strategy to mitigate excess ZrO 2 formation was described by Von Alpen, et al ., who synthesized a ZrO 2 –free NaSICON from Zr‐deficient compositions, though this process generated an amorphous secondary phase (sodium silicophosphate containing trace Zr) that was not stable to aqueous solutions .…”

Section: Introductionmentioning

confidence: 99%

The Influences of Excess Sodium on Low‐Temperature NaSICON Synthesis

et al. 2014

View full text Add to dashboard Cite

Controlling the materials chemistry of the solid-state ion conductor NaSICON is key to realizing its potential utility in emerging sodium-based battery technologies. We describe here the influence of excess sodium on phase evolution of sol-gel synthesized NaSICON. Alkoxide-based sol-gel processing was used to produce powders of Na 3 Zr 2 PSi 2 O 12 NaSICON with 0-2 atomic % excess sodium. Phase formation and component volatility were studied as a function of temperature. NaSICON synthesis at temperatures between 900-1100°C with up to 2% excess sodium significantly reduced the presence of zirconia, sodium phosphate, and sodium silicate secondary phases in fired NaSICON powders. Insights into the role of sodium on the phase chemistry of sol-gel processed NaSICON may inform key improvements in NaSICON development.P. Gouma-contributing editor Manuscript No. 34678.

show abstract

Synthesis and characterization of a NaSICON series with general formula Na2.8Zr2−ySi1.8−4yP1.2+4yO12 (0⩽y⩽0.45)

Cited by 19 publications

References 30 publications

Solid-state synthesis of NASICON (Na3Zr2Si2PO12) using nanoparticle precursors for optimisation of ionic conductivity

Solid-state synthesis of NASICON (Na3Zr2Si2PO12) using nanoparticle precursors for optimisation of ionic conductivity

Optimization of High Conducting Na3Zr2Si2PO12 Phase by new Phosphate Salt for Solid Electrolyte

The Influences of Excess Sodium on Low‐Temperature NaSICON Synthesis

Contact Info

Product

Resources

About