Effect of Co-Substitution on Magnetic Properties in Spinels GeNi2O4 Systems
Effect of Co-Substitution on Magnetic Properties in Spinels GeNi2O4 Systems作者机构：Laboratoire de Physique du Solide Université Sidi Mohammed Ben Abdellah Faculté des sciences BP 1796 Fes Morocco Expert A uprés de I'Académie Hassan H des Sciences et Techniques Rabat Morocco LMPHE Fazulté des Sciences Université Mohamed V Rabat Morocco Member of the Hassan II Academy of Sciences and Technology Rabat Morocco Equipe de Physique du Solide Eeole Normale Supérieure BP 5206 Bensouda Fes Morocco
出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)
年 卷 期：2008年第25卷第11期
页 面：4117-4119页
核心收录：
主 题：the power-law exponents precipitation durative abrupt precipitation change
摘 要：The magnetic properties of spinel GeNi2-2x Co2x O4 systems in the range 0 ≤ x ≤1 are studied by mean field theory and high-temperature series expansions. The nearest neighbouring and the next-neighbouring superexchange interactions J1 （x） and J2（x） are evaluated for these systems in the range 0 ≤ x ≤ 1, by using the first theory. The intra-planar and the inter-planar interactions and the exchange energy are deduced. The second theory is applied in the spinel GeNi2-2xCo2O4 systems, combined with the Padé approximants method, to determine the magnetic phase diagrams （TN versus dilution x） in the range 0 ≤ x ≤1. The obtained theoretical results are in agreement with experimental data obtained by magnetic measurements. The critical exponents associated with the magnetic susceptibility γ and the correlation lengths u are deduced.
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