Synthesis and conduction properties of Na + superionic conductors of sodium samarium silicophosphates

Effect of substitution of Si with V and Mo on ionic conductivity of Na5YSi4O12-type glass-ceramics

“…It is considered that about 10% of total conduction is electronic conduction (hopping conduction by transition metal vanadium) in the specimen (A). This result can explain following facts; the conductivity of the specimen (A) are lower than other N5 conductors [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], and it is seen in Fig. 4 for the specimen (A) that the lines drawn from the conductivity of grains are bending upwards.…”

“…Glass-ceramics of the phosphorus containing Na 5 RSi 4 O 12 (N5)-type (R = rare earth) [1,2] Na + -superionic conductors [3,4] have been developed by crystallization of glasses with the composition Na 3+3x−y R 1−x P y Si 3−y O 9 (NRPS) [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. These materials are reportedly comparable to the conventional ceramic Na + -conductors such as NASICON, β-and β"-aluminas (e. g., NaAl 11 O 17 and NaAl 5 O 8 ).…”

Effect of Microstructure on Ionic Transport in Silica-Based Sodium Containing Nanoconfined Systems and Their Electrochemical Performance as Electrodes

“…To mitigate this issue, sodium-ion batteries have emerged as promising alternatives with the advantages of huge abundance of sodium resources and similar electrochemical principles as lithium. − Recent review research described the structure and conduction mechanism on Na + superionic conducting glass–ceramics depending on the concentration of both phosphorus and rare earth elements as well as the heating conditions of crystallization. , Also, optimum conditions for crystallization concerning the conduction properties and the preparation of crack free N5-type glass–ceramics were discussed. The ionic conductivity of sol–gel-derived phosphorous-induced Na 5 SmSi 4 O 12 was found to be of the order 10 –2 –10 –1 S·cm –1 at 573 K . Hayashi et al.…”

“…29,30 Also, optimum conditions for crystallization concerning the conduction properties and the preparation of crack free N5-type glass−ceramics were discussed. The ionic conductivity of sol−gel-derived phosphorous-induced Na 5 SmSi 4 O 12 was found to be of the order 10 −2 −10 −1 S• cm −1 at 573 K. 31 Hayashi et al discovered that partial substitution of antimony in Na 3 SbS 4 with tungsten introduced sodium vacancies, which exhibited a superior room-temperature conductivity of 32 mS•cm −1 . 32 Sodium-ion conducting glass−ceramics composed of Na 1+x Al x Ge 2−x P 3 O 12 (x = 0.5) gave rise to a total conductivity of 9.27 × 10 −5 S•cm −1 at 140 °C.…”

Na+ SUPERIONIC CONDUCTING GLASS-CERAMICS OF SILICOPHOSPHATES: CRYSTALLIZATION, MICROSTRUCTURE AND CONDUCTION PROPERTIES

“…These results are to be interpreted in terms of the effect of the rare earth ions on the crystallization of N5-type phase in glasses. [15][16][17][18][19][20] In the course of the fundamental studies on glass-ceramic Na 3+3x-y R 1-x P y Si 3-y O 9 , we have interestingly found the crystallization of those N3-and Na 9 YSi 6 O 18 (N9)-type phases as the precursors in the glasses. 27 These are the analogues to the silicates N3 and N9, 10,21 and therefore are the same members of the family of Na 24-3x Y x Si 12 O 36 12 as N5.…”