Electromagnetic modelling of curved structures using a hybrid finite-volume finite-difference time-domain method

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Preparation of Nickel Ferrite from thermolysis of Nickel Hexa(Formato)-Ferrate(III)Hexahydrate

Thermal decomposition of nickel hexa(formato) ferrate(III) decahydrate i.e. Ni3[Fe(HCOO)6]2.10H2O has been studied upto 973 K in static air atmosphere employing TG,DTG,DTA,DSC,XRD,ESR, Mössbauer and infrared spectroscopic techniques. Dehydration occurs in two stages in the temperature range of 348-423 K. Immediately after the removal of the last water molecule, the anhydrous complex undergoes decomposition till α-Fe2O3 and nickel carbonate are formed at 588 K. In the final stage of remixing of cations, a solid state reaction between α-Fe2O3, and nickel carbonate leads to the formation of NiFe2O4, at a temperature (873 K) much lower than for ceramic method. A high value of saturation magnetization i.e. 4440 gauss of the ferrite (NiFe2O4) shows its potential to function at high frequencies

Mössbauer effect studies of alkali bis(citrato)ferrates(III)

Mössbauer spectra of alkali bis(citrato)ferrates(III) i.e. M3Fe(C 6H5O7)2. x H2O (M = Li, Na, Rb, Cs, NH4) at room temperature display a doublet, the isomer shift and quadrupole splitting values indicating these complexes to be high spin with octahedral symmetry. However, in case of K3Fe(C 6H5O7)2.4H2O a single broad absorption band has been observed. The isomer shift shows a decreasing trend with the increase in the electronegativity of the substituent cation. Isomer shift also increases with the increase in cationic size (Li+, Na+, K+, Rb+, Cs+, Na+4). A linear correlation between isomer shift and the separation C=O stretching frequencies (Δν) has also been observed.Les spectres Mössbauer de bis(citrato)ferrates alcalins, c'est-à-dire M 3Fe(C6H5O7)2. x H2 O (M = Li, Na, Rb, Cs, NH4) montrent un doublet à temperature ambiante ; le déplacement isomérique et la séparation quadrupolaire indiquent que ces complexes sont de spin élevé et de symétrie octaédrique. Dans le cas de K3Fe(C 6H5O7)2. 4 H2O nous observons cependant une seule ligne élargie. Le déplacement isomérique décroît quand l'électronégativité du cation en substitution croit ; il croit avec la taille du cation (Li+, Na+, K+, Rb+, Cs+, NH+4). Une corrélation linéaire entre le déplacement isomérique et l'intervalle (Δν) en modes de vibration C=O a également été observée

Reviews

Bankrupt Education: The decline of liberal education in Canada by Peter C. Emberley and W.R. Newell, reviewed by L.M. Findlay. International Education and the University edited by Jessica Kingsley and James Callej, reviewed by Wayne Ingalls. Higher Education: The lessons of experience by The World Bank, reviewed by Wayne Ingalls. First Nations Education in Canada: The Circle Unfolds edited by Marie Battiste and Jean Barman, reviwed by Douglas Smith. Heritage Languages and Education edited by Marcel Danesi, Keith McLeod and Sonia Morris, reviewed by Jo-anne Lee. Aboriginal Languages and Education: The Canadian Experience edited by Sonia Morris, Keith McLeod, and Marcel Danesi, reviewed by Marie Battiste. Educational Management and Leadership: World, Spirit, and Deed for a Just Society by D.J. Thom, reviewed by Merla Bolender. Literacy and Power: The Latin American Battleground by David Archer and Patrick Costello, reviewed by Susan E. Smith. The Future of Literacy in a Changing World edited by Daniel Wagner, reviewed by J. Kachur. New Directions for Equity in Mathematics Education edited by W.G. Secada, E. Fennema, and L.B. Adajian, reviewed by B.S. Randhawa