Abstract Ammonium nitrate (NH4NO3) represents a cheap, chlorine-free alternative to ammonium perchlorate for use as an oxidant solid propellants. But its poor ignitability and low burning rate are all disadvantages achieve such purposes. For this reason, it is necessary carry out studies improve combustion characteristics, seeking combine with catalysts or fuels. The present work explores the p...

-Six well-characterized soil kaolins from widely separated sites in south-western Australia and four reference kaolins were studied by 57Fe M6ssbauer spectroscopy at room temperature after removal of non-structurally-bound iron with dithionite-citrate-bicarbonate solution. The soil kaolins and one of the reference kaolins were also studied at temperatures near 16 K. The soil kaolins were remark...

Introduction: Martian meteorite MIL03346 is described as an augite-rich cumulate rock with ~80%, ~3%, and ~21% modal phase proportions of augite (CPX), olivine and glassy mesostasis, respectively, and is classified as a nakhlite [1]. The Mossbauer spectrum for whole rock (WR) MIL 03346 is unusual for Martian meteorites in that it has a distinct magnetite subspectrum (~7% subspectral area) [2]. ...

2014 An algorithm is described which simulates a random network of corner-sharing octahedra with no dangling bonds, representing the structure of amorphous AB3 compounds. The density, the partial radial distribution functions, bond angle distributions and ring statistics are presented. The monopolar electric field gradients at the iron sites of this model are also calculated, using a point char...

Using the system Fe(SH)4 to model the active site of rubredoxin, we have carried out a b initio quality Hartree-Fock and extensive configuration interaction studies of the ground and excited states of both the oxidized and reduced systems. We have established that the ground state is high spin in both redox forms and find charge distributions in agreement with Mossbauer studies. Based on calcul...

A combination of magnetic susceptibility and Mossbauer measurements on quasicrystalline i­ Ah4Mn2o-xFexSi6 (0.02 ~ x ~ 7.5) establishes that Mn atoms in i-Ab4Mn2oSi6 occupy two distinct classes of sites, and that Fe substitutes for only one of them. The two classes are distinguished by the possession or otherwise of a localized magnetic moment. The data are consistent with a structure of in­ te...

A protonated and a completely deuterated two-iron algal ferredoxin from Synechococcus lividus have been studied by optical, electron paramagnetic resonance, electron-nuclear double resonance, proton magnetic resonance and Mossbauer spectroscopies; temperature dependent magnetic susceptibility measurements are reported as well. These studies have confirmed the electron localized model of the act...