Phase transformation and ionic conductivity mechanism of a low-temperature sintering semiconductor Na2CaV4O12

Na2CaV4O12: A low-temperature-firing dielectric with lightweight, low relative permittivity, and dielectric anomaly around 515 C

“…ceramics. Upon further increasing the temperature, however, a dielectric anomaly peak was observed at ~515 o C (Figure 4b), which coincided with the previously determined phase transition at 510 o C via various-temperature XRD [15] . This proves that the origin of the dielectric anomaly is associated with the phase transition from P4/nbm to P4 ̅ b2.…”

“…The results along with the Rietveld refinement were already published in our recent work [15] . The microstructure was analyzed using scanning electron microscopy (SEM, JSM-6380, Japan).…”

Remarkable Infrared Nonlinear Optical, Dielectric, and Strong Diamagnetic Characteristics of Semiconducting K3[BiS3]

“…According to the resistivity value and pellet dimensions, the ionic conductivity of 1 is on the order of 10 –5 mS cm –1 . This value is lower than that of commercial materials for solid state electrolyte applications in battery technologies, e.g., K 2 Fe 4 O 7 (50 mS cm –1 ), Al-doped K 2 CdO 2 (2.2 × 10 –2 mS cm –1 ), Na 2 CaV 4 O 12 (2.5 × 10 –1 mS cm –1 ), or Li 7 La 3 Zr 2 O 12 (4.8 × 10 –1 mS cm –1 ) . The low ionic conductivity of 1 can be explained by the isolated, highly charged anionic units of [BiS 3 ] 3– in the crystal lattice, which result in comparably strong ionic interactions, hampering the ionic mobility.…”

Synthesis, crystal structure, and characterization of Na2SrV4O12: A low‐firing dielectric vanadate

“…Metal vanadates have been widely applied as the matrix in fluorescence and laser materials and recently showed promising application potential in photocatalyst and lithium‐ion batteries due to their low dielectric permittivity and low loss 1–5 . Compared to silicates, crystalline vanadates possess versatile structural chemistry stemming from the various extensions of vanadium–oxygen polyhedra 6–9 . Depending on the manner of polymerization, diverse structural configurations are formed in vanadates, including chains, sheets, and three‐dimensional blocks 10–13 .…”

“…[1][2][3][4][5] Compared to silicates, crystalline vanadates possess versatile structural chemistry stemming from the various extensions of vanadium-oxygen polyhedra. [6][7][8][9] Depending on the manner of polymerization, diverse structural configurations are formed in vanadates, including chains, sheets, and three-dimensional blocks. [10][11][12][13] Among them, a rare cyclic structure configuration, which was built by an isolated tetracyclic unit [V 4 O 12 ], has been specialized.…”