The homogeneous CuZnO and heterogeneous Ag/ZnO nanorods were synthesised by controlling the ionic radius of Cu and Ag with lattice of ZnO. The structure of CuZnO and Ag/ZnO was investigated by a series of methods. The study of the photoelectric properties suggested both the homogeneously and ...
It is emphasized that the size of the Ag ion is more suitable for conduction than that of the Cu ion in this phase. Since the ionic radius for the Ag ion is larger than that of the Cu ion, we propose a model other than the gate model to explain this experimental fact....
In this crystal, while iodide ions are characterized as constructing a fixed sublattice, silver ions behave in a liquid-like manner. The iodide ions, which have a much larger ionic radius than the silver ions, construct a b.c.c. sublattice as shown in Fig. 3. While the position of ...
This concept focuses on the polarizability of the metal ion, which is approximated using the ionic potential (electrostatic binding) as defined by z/r (z = charge, r = ionic radius) and ionization potential (In) of M to Mn+ (electron acceptor power). Polarizability reflects the ability of...
The root/organic soil concentration ratio; R/ S) of 50 cationic mineral elements was related to their ionic properties, including ionic radius ( r), ionic charge ( z), and ionic potential ( z/ r or z 2/ r). The materials studied were ectomycorrhizal beech ( Fagus sylvatica L.) roots...
内容提示: Ionic radius1Ionic radiusIonic radius, r ion , is the radius ascribed to an atom's ion. Although neither atoms nor ions have sharp boundaries, itis useful to treat them as if they are hard spheres with radii such that the sum of ionic radii of the cation and aniongives the ...
Unit cell parameters (in pm, equal to two M–X bond lengths) for sodium and silver halides. All compounds crystallize in the NaCl structure. An "anomalous" ionic radius in a crystal is often a sign of significantcovalentcharacter in the bonding. No bond iscompletelyionic, and some supposedly...
An"anomalous"ionicradiusinacrystalisoftenasignofsignificantcovalentcharacterinthebonding.Nobondis completelyionic,andsomesupposedly"ionic"compounds,especiallyofthetransitionmetals,areparticularly covalentincharacter.Thisisillustratedbytheunitcellparametersforsodiumandsilverhalidesinthetable.Onthe basisofthefluorides,one...
The equivalent for ionic solids, the radius ratio rules, are notoriously unsuccessful even for simple binary compounds. Differences in shape lead to considerable differences in the ranges of structures adopted, and these modify the questions that computer modelling is seeking to address. Many molecular...
because the greater covalent character of the bonds in AgCl and AgBr reduces the bond length and hence the apparent ionic radius of Ag+, an effect which is not present in the halides of the more electropositive sodium, nor in silver fluoride in which the fluoride ...