RT book part
T1 TEM study of superconducting polycristalline diamond
A1 Alegre Salguero, María de la Paz
A1 Villar, Maria del Pilar
A1 Araújo Gay, Daniel
A1 Bustarret, Etienne
A1 Caprón, T
A1 Williams, O.A.
K1 Superconductivity
K1 polycristalline diamond
K1 TEM
K1 Z-Contrasts
AB Heavily Boron-doped MPCVD-grown (Microwave Plasma Chemical Vapour Deposition)polycrystalline diamond layers were observed to have a superconducting character depending exclusively on the growth time, i.e. grown under identical experimental conditions. To elucidate such behavior, morphology aspects are investigated using Transmission Electron Microscopy (TEM). Diffraction contrasts and High Angle Annular Dark Field (HAADF) observations show that grains are thicker and boron enrichment occur at grain boundary in the superconducting samples. Interfacial effects are the main difference between the two samples, in the nonsuperconductingones descohesion effect is observed. In both samples boron concentration is nearly constant except in isolated grains and twins, where their crystal orientation probably influences boron incorporation during growth. In summary, as grain configuration changes along the growth, a threshold thickness should beover passed to allow an optimum transport between the diamond grains.
SN 0094-243X
YR 2010
FD 2010-01-01T00:00:00Z
LK http://hdl.handle.net/10498/17162
UL http://hdl.handle.net/10498/17162
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 06-nov-2026