K. et al.; " Cation and anion ordering in the layered oxyfluorides Sr3-xAxA1O4F (A=Ba, Ca) "; J. Solid State Chem. 172, 89-94 (2003).Cation and anion ordering in the layered oxyfluorides Sr3-xAxA104F (A=Ba, Ca). Prodjosantoso A. K,Kennedy B. J,Vogt T. et al. Journal...
For the first time the concept of proton-hydride interactions to promote hydrogen release is applied to a cation-anion pair in a complex metal hydride. NH4Ca(BH4)3 is prepared mechanochemically from Ca(BH4)2 and NH4Cl as well as NH4BH4 following two different protocols, where the synthes...
2.3. Crystal Structure of NH4Ca(BH4)3 In the ammonium calcium borohydride perovskite the NH4+ cation occupies the A-site of the perovskite structure, where Ca is the B-cation and the BH4− anion is the ligand. We have chosen to model the structure in an ordered manner in a subgroup ...
The adverse effect of an anionic diet with a negative dietary cation–anion difference on prepartum DMI is also well documented [9]. Anionic salts should be consumed in a 3 weeks period before calving, so it will be difficult to consume them and maintain the proper levels in the diet. ...
It is suggested that the density of anion exchange sites in Ehrlich cells could be the same as in red blood cells, but with a lower turnover rate. The other system is an anion-cation co-transport system capable of mediating a secondary active Cl<latex>$^-$</latex> ...
Fe4+ content and ordering of anion vacancies in partially reduced AFexTi1-xO3-y (A = Ca, Sr; x ≤ 0.6) perovskites. An 57Fe Mossbauer ... J,C,Waerenborgh,... - 《Journal of Physics Condensed Matter》 被引量: 34发表: 2001年 Influence of doping on the cation ordering and charge...
3) and give some insights about the cation and anion sublattices. Table 1 contains the calculated cell parameters, crystallographic positions and fitted values obtained from the refinements. Both, A- and B- site cations are randomly distributed within the structure. An oxygen deficiency of δ ...
Other cations: Being a major cation, calcium availability is related to the soil CEC, and it is in competition with other major cations such as sodium (Na+), potassium (K+), magnesium (Mg++), Ammonium (NH4+), iron (Fe++), and aluminum (Al+++) for uptake by the crop. High K ...
731 nm. The former band could be attributed to either Al-O–-Al centres, related to the coupled K-Si–Ba-Al substitution, or Al-O-Ti bridges, or both defects21,36, whereas the latter band corresponds to traces of Fe3+ in the mineral structure. Partially and/or completely albitized ...
In addition, as a compensation mechanism to meet cation needs of vital organs, a low Ca intake (dietary Ca deficiency) provokes intestinal Ca resorption as well as renal Ca reabsorption ( Centeno et al., 2009 ). The changes in the intestinal microenvironment, gene expression and gut flora ...