Die Kristallstruktur von α‐CaCr₂O₄

Abstract

Einkristalle der Hochtemperaturform α‐CaCr2O4 wurden röntgenographisch untersucht (a = 11,059, b = 5,836, c = 5,114 Å, Raumgruppe D 2h13–Pmmn). α‐CaCr2O4 ist mit SrCr2O4 isotyp.

120∘helical magnetic order in the distorted triangular antiferromagnetα-CaCr2OTóth1, Lake2, Kimber3 et al. 2011Phys. Rev. B315510View full textAdd to dashboardCite

“…Our values are in agreement with those from the previous room temperature measurement of Ref. 19. The quality of fit is given by the R F -factor values: R F = |F OBS − F CALC |/ |F OBS |, where F OBS and F CALC are the observed and calculated structure factors.…”

“…The structural refinement was performed using the FullProf software. 22 All the peaks could be indexed in the space group P mmn in agreement with previous powder measurements 19,20 and no detectable impurity was observed. There is a broad bump around 2θ = 25…”

“…19 Although this compound is also distorted from ideal triangular symmetry (orthorhombic space group P mmn), the distortion does not lower the dimensionality and is of a different type to that explored previously. Figure 1 shows the crystal structure.…”

Helical magnetic state in the distorted triangular lattice ofα-CaCr2O4Chapon1, Manuel2, Damay3 et al. 2011Phys. Rev. B3414530View full textAdd to dashboardCite

“…In case of a first-order transition, it is known that the former method can yield spurious results, 16,17 whereas the latter is able to account for both the latent heat and hysteretical features. The crystal structure of α-CaCr 2 O 4 was first reported by Pausch et al 12 . It crystallizes with orthorhombic symmetry, confirmed by our Electron Microscopy measurements (not shown) in the space group P mmn (Fig.…”

Multiferroicity in geometrically frustratedα-MCr2O4Zhao1, Lan2, Wang3 et al. 2012Phys. Rev. B11020View full textAdd to dashboardCite

“…Although α-phase MCr 2 O 4 had been synthesized and structurally characterized dozens of years ago, [19][20][21] their physical properties at low temperature have not been investigated until recently. Chapon et al [22] first investigated the magnetism and magnetic structure of polycrystalline α-CaCr 2 O 4 .…”