The structural changes in a condensed film of Ni at heating

In electronic microscope, supplied the prefix for heat the structural evolutionary processes happening in the condensed film Ni, thickness #approx# 30 nm investigates. At 500...550 deg. C the processes of collective recrystallization are observed which happen on a hum noise of arising of micro-strip fragmentation. The structural fragments of a film are in a condition of oscillations or vibrations. At 650 deg. C owing to mass-transfer the drop-like islands of Ni are formed. The process is interpreted as a beginning of sintering of nanosize powders. Researches of structural modifications in crystalline films of Cu and Ag and condensed films of Au have shown presence of effect of structural modifications at heat of samples up to #approx# 300...400 deg. C. These modifications were accompanied, in particular, any integration of fragments of films. Last can be interpreted as a beginning of sintering of the pressed bars from nanodispersive powders. The purpose of the given work is the research of structural modifications in a condensed film of Ni by a thickness #approx# 30 nm, marked on a coal substrate at temperature +20 deg. C. Structural formation studied in transmission electron microscope EhMV-100L, supplied by a prefix for heat up to 1100 deg. C. The working vacuum in column made 2.10"-"3 Pa. On fig.1 a, the image of a condensate of high-clean Ni on a coal substrate is submitted at 300 deg. C. The ''natural'' singularities of a contour of a surface were used as a place of identification of area of study of substructural modifications at heating. The electron diffraction pattern, fig.1 b, contains lines Ni, h, k, l, according (111), (200), (220), (311), (222) etc. This structure of a film does not differ from those in an initial condition, i.e. at + 20 deg. C. (author)Translated from Russian (Presented at Advanced Materials '99, Kiev)Available from British Library Document Supply Centre-DSC:9023.190(9951) / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo