Preparation and Properties of the Systems Fe(2-x)Cr(x)WO6, Fe(2-x)Rh(x)WO6, and Cr(2-x)Rh(x)WO6

摘要

Solid solutions of the end members Fe2WO6, Cr2WO6, and Rh2WO6 have been prepared and their crystallographic and magnetic properties have been studied. All solid solutions crystallize with the trirutile structure, and their magnetic behavior is characterized by the existence of antiferromagnetic interactions and effective molar Curie constants corresponding to those expected from contributions of the spin-only moments of high-spin F3(3+), Cr3+, and diamagnetic low-spin Rh(3+) ions. Fe2WO6 crystallizes with the tri-alpha-PbO2 structure and is antiferromagnetic and conducting. The random rutile Rh2WO6 is conducting, and the difference between its magnetic and electric properties and those of the inverse trirutile Cr2WO6 are discussed in terms of possible interactions between Cr(3+)(3D) or Rh(3+)(4d) orbitals and W(6+) (5d) orbitals.