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An EPR investigation of NH4AlF4:Fe3+ evidences an order—disorder transition in this compound. The full ordering occurs below 145 K. The P42/mbc space group is proposed for the low temperature phase,… (More)
The various mechanisms proposed to account for the zero field splitting of Mn2+ are compared with the experimental results obtained in the cubic AMF3 compounds and in the tetragonal phase of RbCaF3… (More)
Abstract NH4A1F4 exhibits an order-disorder phase transition near 150 K which is studied through E.P.R. experiments. Fe3+ line shape is analyzed with the Kubo-Anderson theory and shows near 180 K a… (More)
2014 The various mechanisms proposed to account for the zero-field splitting of Mn2+ and the predictions of the superposition model are compared with the experimental results obtained in the cubic… (More)
Abstract A critical broadening and shape changeover in E.P.R. s.h.f. lines evidence a critical slowing down in the order parameter fluctuations.
The authors show the efficiency of local measurements with an EPR probe by considering the mixed crystals Rbx(NH4)1-xAlF4 and Fe3 probe substituted for Al3+. In pure NH4AlF4 they study the oriental… (More)
Abstract Using the L.C.A.O.-M.O. scheme, we review the different stages of the calculation of the overlap and covalency contribution to the zero-field splitting of 6 S state ions. We calculate… (More)
Abstract The chiolite Na 5 Al 3 F 14 doped with Fe 3+ gives the opportunity of a detailed discussion of the superposition model applied to the crystal field parameters of the spin-Hamiltonian of 6 S… (More)
Abstract La structure pre´cise de Na 5 Al 3 F 14 ( P 4m nc ; a = 7.0138(8); c = 10,402(2)) ae´te´de´termine´e par rayons Xa`partir de 466 re´flexions ( R = 0,021; R ω = 0,028). La structure est… (More)