Published on Web 07/27/2006
Structural Features of the Modulated BiCu2(P1-xVx)O6 Solid Solution; 4-D Treatment of x ) 0.87 Compound and Magnetic Spin-Gap to Gapless Transition in New Cu2+ Two-Leg Ladder Systems Olivier Mentre´ ,*,† El Mostafa Ketatni,‡ Marie Colmont,† Marielle Huve´ ,† Francis Abraham,† and Vaclav Petricek§ Contribution from the Laboratoire de cristallochimie et physicochimie du solide de Lille, UMR CNRS No. 8012 - ENSCL, BP 108 - 59650 VilleneuVe d’Ascq, France, Laboratoire d’Electrochimie et chimie des mate´ riaux, Faculte´ des Sciences et Techniques, BP 523, Be´ ni Mellal, Morocco, and Institute of Physics, Academy of Sciences of the Czech Republic, 18221 Praha, Czech Republic Received May 4, 2006; E-mail:
[email protected] Abstract: The BiCu2(P1-xVx)O6 system shows the appearance of various phenomena that progressively change as a function of the average (P/V)O4 groups size. Then, from x ) 0 to x ≈ 0.7, a solid solution exists with respect to the basic orthorhombic unit cell of BiCu2PO6. For greater x values (0.7 < x
