Extensive X-band EPR measurements have been carried out on Gd3+-doped single crystals of LiY& "Yb"F4 (x =0. 0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0), covering the temperature range 4.2 -290 K.The spin-Hamiltonian parameters (SHP) are evaluated by the use of a rigorous least-squares fitting procedure. The systematics of the SHP are studied both as functions of x and of temperature. Newman's superposition model has been applied to the calculation of SHP; it is found that the calculated values agree quite well with the experimental values, provided that one considers minor distortions of the positions of the eight fluorine ions surrounding the Gd'+ ion. The temperature variation of SHP has been explained to be predominantly due to spin-phonon interaction and partially due to thermal expansion of the crystal lattice. Finally, the average Gd'+-Yb'+ exchange interaction, averaged over the nearest and next-nearest neighbors, has been estimated, in LiYO 9 Ybo lF4, to be 3.8+2.5 6Hz, as found by the application of the molecular-field model using the g shift from the isostructural diamagnetic host, LiYF4, at liquid-helium temperature.
The spin-Hamiltonian parameters for Gd +-doped single crystals of RF3 (R = La, Ce, Pr, and Nd) are analyzed using the linear superposition model of Newman. It is found that the parameters can be adequately described within the framework of the superposition model for values of t2 and t4 being 9 and 14, respectively, provided that one consider small distortions (within 3') of the azimuthal angles $; of eight F ions nearest to Gd + in the various hosts due to the presence of the Gd3+ ion. The significance of the success in the application of the superposition model to the analysis of Gd + spin-Hamiltonian parameters in isostructural hosts is discussed. It is found that the zero-field splitting is a linear function of the intrinsic parameter b2 for the. Gd3+ ion doping the various hosts.
MikołAjczAk P, NAPiórkowski j. Analysing the reliability of working parts operating in abrasive soil pulp taking into consideration confounding factors. Eksploatacja i Niezawodnosc -Maintenance and reliability 2016; 18 (4): 544-551, http://dx
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.