Magnetic order suppression and structural characterization of MnNb2-xVx

Structural properties and Raman spectra of columbite-type NiNb$_{2-x}$V$_x$O$_6$ synthesized under high pressure

“…These values are almost the same as those found in Ref. [5] for A = Mn, and point to a remarkable anisotropic response of the atomic arrangement to chemical substitution of the B-site in both systems. This response seems to be independent of the magnetic nature of the A-ions interactions.…”

“…Recently, new and more powerful experimental techniques make possible the study of the physical properties of these compounds thus renewing the interest on them. In 2017 the structural and magnetic properties of the Pbcn-MnV 2 O 6 [11] were first reported, and it was later found that the magnetic order is suppressed in the Pbcn-MnNbVO 6 [5]. A study of the Raman-spectrum at different values of externally applied pressure on Pbcn-MgV 2 O 6 was also recently reported in Ref.…”

“…The spectrum shown in Fig. 5 B 3g (7) A g (5) A g (7) A g (9) B 1g (11) B 1g (12) A g (8) A g (11) Figure 5: High quality Raman spectrum of the NiNb 2 O 6 . The three regions of relative wavenumber mentioned in the text are separated by the vertical dashed lines.…”

“…The group of the AB 2 O 6 vanadates is the richest one in terms of polymorphism. For example, the compounds AV 2 O 6 present a monoclinic structure of space group C2/m when A = Mn, Cd, Mg, or Zn [5,6]; meanwhile, depending on the temperature of synthesis, at room pressure the structure of CoV 2 O 6 can be monoclinic (α−phase) or triclinic (γ−phase) [7,8,9], and it is unequivocally triclinic when A = Ni, Cu. The vanadates with A = Ni, Mg, Co, Zn, Mn and Cd were produced in the columbite-type structure in 1973 by using conditions of synthesis of high pressure/high temperature (HPHT) [10]; at the time only partial studies on the structure were done.…”

Raman spectra of vanadates MV2O6 (M=Peña1, Bouvier2, Hneda3 et al. 2021Journal of Physics and Chemistry of SolidsSelf Cite12000View full textAdd to dashboardCite

“…When B =V in the formula M B 2 O 6 , these compounds are part of the so called "vanadate" phases. When synthesised at room pressure these vanadates are found to adopt low symmetry structures such as triclinic P 1 for M =Cu, Ni or monoclinic C2/m for M =Mg, Mn, Cd and Zn [9,10]; when M =Co the structure can be triclinic or monoclinic depending on the temperature of synthesis [11,12,13]. By high pressure and temperature (HPHT) synthesis, some of these vanadates can be obtained in an orthorhombic structure with the Pbcn space group [14,15,16]; this is the columbite-type structure, typical of the room-pressure synthesised niobates (M B 2 O 6 , B =Nb).…”