Eur. Phys. J. B 9, 445-459 (1999)
https://doi.org/10.1007/s100510050786

Experimental determination and modelization of a unique phase diagram: solid solutions of antiferromagnetic organometallic radical cation salts C^p2Mo(dmit)^+•][X^-_(x)(X^- = AsF^-₆ or SbF^-₆

¹ Centre de Recherche Paul Pascal, CNRS, avenue du Dr. Schweitzer, 33600 Pessac, France
² Institut Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, BP 32229, 44322 Nantes cedex 03, France
³ Institut de Chimie de la Matière Condensée de Bordeaux, avenue du Dr. Schweitzer, 33600 Pessac, France
⁴ Laboratoire de Physique des Solides, CNRS-Université Paris-Sud, Bâtiment 510, 91405 Orsay cedex, France

Received: 5 August 1998
Published online: 15 June 1999

Abstract

The physical properties of paramagnetic Mo(V) organometallic radical cation salts, , are investigated through the study of two series of solid solutions incorporating two kinds of anions ( or ). The combination of EPR and X-ray diffraction is used to specify the nature of the structural phase transitions which occur in the paramagnetic phase and to determine the corresponding (T, x) phase diagrams. Finally, antiferromagnetic resonance is studied to probe the low temperature antiferromagnetic ground state. In the last part of the paper, the observed complex phase diagram is analyzed by considering a compressible model with at least two independent modes of compression. We conclude that the larger compressibilities are associated with the smaller anions.