Magnetic Modulation in Mechanical Alloyed Cr1.4fe0.6o3 Oxide

We have synthesized Cr1.4Fe0.6O3 compound through mechanical alloying of Cr2O3 and Fe2O3 powders and subsequent thermal annealing. The XRD spectrum, SEM picture and microanalysis of EDAX spectrum have been used to understand the structural evolution in the alloyed compound. The alloyed samples are matching to rhombohedral structure with R3C space group. The observation of a modulated magnetic order confirmed a systematic diffusion of Fe atoms into the Cr sites of lattice structure. A field induced magnetic behaviour is seen in the field dependence of magnetization data of the annealed samples. The behaviour is significantly different from the mechanical alloyed samples. The experimental results provided the indications of considering the present material as a potential candidate for opto-electronic applications.Comment: 8 figure

Reinforcement Learning with Non-uniform State Representations for Adaptive Search

The following topics are dealt with: mobile robots; path planning; robot vision; autonomous aerial vehicles; remotely operated vehicles; rescue robots; cameras; multi-robot systems; emergency services; learning (artificial intelligence)

Synthesis and dissolution of chromium substituted magnetites in V(II)-EDTA formulation

60-67Chemical cleaning or scale removal of boilers, heat exchangers etc., involves the dissolution of metal oxides, which are corrosion products from the base metal. Iron oxides mainly hematites and magnetites are commonly found in the case of Fe based alloys due to corrosion. The decontamination of primary system surface of water-cooled nuclear reactors, in particular Pressurized Light Water Reactor (PWR)/ Pressurized Heavy Water Reactor (PHWR) involves the dissolution of iron oxides formed under reducing coolant chemistry environment ca. magnetite type of oxide matrix. Thus in the present study, the dissolution characteristics of Cr-substituted (0-20 at% Cr) magnetites (c.s.m) in V(II)-EDTA formulation at 353±5 K are reported. The oxides employed were prepared synthetically by co-precipitation method, moderately sintered and physic-chemically characterized. The dissolution rate coefficient, k1 and the percentage of dissolution were determined. The oxidative pre-treatment of these oxides employing viz., AP, NP and HMnO4 had resulted in improved dissolution