Comparison of the crystal structures and magnetic properties of the low- and high-temperature forms of AgCuPO4 : crystal structure determination, magnetic susceptibility measurements, and spin dimer analysis

  • BEN YAHIA, Hamdi
  • GAUDIN, Etienne
  • DARRIET, Jacques
  • DAI, Dadi
  • WHANGBO, Myung-Hwan
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Publication date
January 2006
Publisher
American Chemical Society (ACS)
Journal
Inorganic Chemistry

Abstract

The crystal structure of the low-temperature form of AgCuPO4 (i.e., -AgCuPO4) was determined by powder X-ray diffraction and was compared with that of the high-temperature form of AgCuPO4 (i.e., -AgCuPO4). The magnetic properties of the two forms were examined by measuring their magnetic susceptibilities and evaluating the relative strengths of their spin-exchange interactions on the basis of spin-dimer analysis. Both forms of AgCuPO4 have layers of Cu2P2O8 alternating with silver-atom double layers; -AgCuPO4 has two Cu2P2O8 layers per unit cell, while -AgCuPO4 has one. The coordinate environment of each Cu2+ ion is close to being a distorted square pyramid in -AgCuPO4, but it is close to being a distorted trigonal bipyramid in -AgCuPO4. Th...

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