Anelastic Relaxation in Crystalline Solids

Anelastic Relaxation of Metallic Glasses

Superheating systematics of crystalline solids

Systematics of superheating (u5T/Tm21) of crystalline solids as a function of heating rate (Q) are established as b5A(Q)(u11)u, where the normalized energy barrier for homogeneous nucleation is b516pgsl 3 /(3kTmDHm 2 ), T is temperature, Tm melting temperature, A a Q-dependent parameter, gsl interfacial energy, DHm heat of fusion, and k Boltzmann’s constant. For all elements and compounds inves...

The Nature of Crystalline Solids

In an assembly of atoms or molecules a solid phase is formed whenever the interatomic (intermolecular) attractive forces significantly exceed the disruptive thermal forces and thus restrict the mobility of atoms, forcing them into more-or-less fixed positions. From energy considerations it is evident (as discussed in LN-2) that in such solids the atoms or molecules will always attempt to assume...

Crystalline Solids of Alloy Clusters

AuAg alloy clusters protected with octadecanethiol (ODT) monolayers form crystalline solids whose powder X-ray diffractograms can be indexed to single cubic unit cells. These solids can also be regarded as superlattices of alloy clusters. The bulk Au:Ag ratio is significantly different from the metal salt feed ratio used for the synthesis of the alloy clusters. The surface plasmon resonance ban...

Anelastic Relaxation of Protonic Defects in M3+-Doped BaCeO3

When perovskite-structured BaCe03 is doped with M ~ + ions (e.g., ~ d ~ + , Gd3+,yb33 that substitute on ce4+ sites, oxygen-ion vacancies are created for charge compensation. However, when treated in water vapor, the vacancies are replaced by protons, which take the form of OH' ions. This treatment makes the materials a good protonic conductor. Questions about the defect structure of the proton...