Breakdown of superconductivity in a zinc whisker with controllable quasiparticle flooding

2011

AMR

The influence of grain size on the lattice constant in some nanocrystallites of perovskite structure was studied in experiment. Some nanometer ultra fine particles of CaMnO3, Nd0.67Sr0.33MnO3 and Nd0.67Sr0.33Mn0.9Cu0.1O3 were prepared by sol-gel method, which were characterized by XRD, thus phase compositions, lattice constants and grain sizes could be obtained. It was found that their lattice constants all decreased with the decreasing grain sizes. In the end, this phenomenon were explained by the binding energy theory.

Section: Introductionmentioning

confidence: 99%

Study on the Relation of Lattice Constant Dependence on the Grain Size in Some Nanocrystallites of Perovskite Structures

2011

AMR

“…In recent years, many researchers pay attention to the influence of lattice constant on the material performance [1,2,3,4] . It was found that the lattice constant increased with the decreasing grain size of some nanocrystallites [5] , while some changed inversely [6] .…”

mentioning

confidence: 99%

Theoretical Study of Lattice Constant Dependence on the Grain Size in Some Nanocrystallites

2010

AMR

The influence of grain size on the lattice constant in some nanocrystallites was studied by computing the interactive cohesive energy of the nanocrystallites. The relationships of the lattice constant with the grain size in NaCl, CsCl structure ionic crystallites, FCC, BCC structure metal crystallites and FCC, BCC, SCC structure molecular crystallites was studied respectively. The results are in good agreement with the above experimental ones qualitatively.

Experimental Study of Lattice Constant Dependence on the Grain Size in some Nanocrystallites

2010

AMR

The influence of grain size on the lattice constant in some nanocrystallites was studied by in experiment. It is found that the lattice constant of NaCl, CsCl structure ionic crystallites decreases with the reduction of the grain size. The lattice constant of ultrafine iron and nickel particles increases with the reduction of the grain size. As to the experiment result of g-Fe2O3 nanocrystallites, the lattice constant increases with the decreasing of the grain size. It is opposite to the theoretical result of ionic crystallites, which reason is that the combination of most of atoms in g-Fe2O3 is by the covalent bond other than electrovalent bond.