Structural, luminescence, and electronic properties of the alkaline metal-strontium cyclotetravanadatesM2Sr(VO3)4

K2CaV2O7: a pyrovanadate with a new layered type of structure in the A2BV2O7family

“…These deviations imply that for the sodium and especially for the lithium pyrovanadates the CaV 2 O 7 2− complex anions should be overcompressed to make these compounds stable, or, in other words, Na 2 CaV 2 O 7 and Li 2 CaV 2 O 7 are unstable. To support our above reasoning we made a similar extrapolation for the isomorphous series A 2 Sr(VO 3 ) 4 (A = Na, K, Rb, Cs) 25,41,42 (Fig. 8b).…”

“…1 Ternary diagram illustrating the phases occurring in the K 2 O-CaO-V 2 O 5 system. 4,5,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] The K 2 CaV 2 O 4 compound is marked in the diagram by a white dot. It can be obtained at high-pressure; its formation was not observed during our synthesis 24,26 27 which can be evidence of some structural difficulties to stabilise these compounds.…”

“…Fig.1Ternary diagram illustrating the phases occurring in the K 2 O-CaO-V 2 O 5 system 4,5,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. The K 2 CaV 2 O 4 compound is marked in the diagram by a white dot.…”

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 .…”

“…Among them, a rare cyclic structure configuration, which was built by an isolated tetracyclic unit [V 4 O 12 ], has been specialized. Till now, such materials have been rarely reported and are mainly based on a general formula M 2 M′(XO 3 ) 4 , for example, Na 2 Sr(VO 3 ) 4 , CaY 2 (GeO 3 ) 4 7,14 …”