Amorphous hydrogenated silicon carbide (a-SiC:H) films are produced by remote microwave hydrogen plasma (RHP)CVD using triethylsilane (TrES) as the single-source precursor. The reactivity of particular bonds of the precursor in the activation step is examined using tetraethylsilane as a model compound for the RHP-CVD experiments. The susceptibility of a TrES precursor towards film formation is characterized by determining the yield of RHP-CVD and comparing it with that of the trimethylsilane precursor. The effect of substrate temperature (T s ) on the rate of the RHP-CVD process, chemical composition, and chemical structure of the resulting a-SiC:H films is reported. The substrate temperature dependence of the film growth rate implies that film growth is independent of the temperature and RHP-CVD is a mass transport-limited process. The examination of the a-SiC:H films, performed by means of X-ray photoelectron spectroscopy (XPS), elastic recoil detection analysis (ERDA), and Fourier transform infrared absorption spectroscopy (FTIR), reveals that the increase in the substrate temperature from 30 -C to 400 -C causes the elimination of organic moieties from the film and the formation of a Si-carbidic network structure. On the basis of the results of the structural study, the chemistry involved in film formation is proposed.

Abstract

Stone Age people handled their dead in various ways. From the Late Mesolithic period onwards, the deceased were also buried in formal cemeteries, and according to radiocarbon dates, the cemeteries were used for long periods and occasionally reused after a hiatus of several hundred years. The tradition of continuous burials indicates that the cemeteries were not only static containers of the dead but also important places for Stone Age communities, which were often established in potent places and marked by landscape features that might have had a strong association with death. The paper explores the tradition of burials in cemeteries exemplified through Jönsas Stone Age cemetery in southern Finland. Here the natural topography, along with memories of practices conducted at the site in the past, played a significant role in the Stone Age mortuary practices, also resulting in the ritual reuse of the cemetery by the Neolithic Corded Ware Culture.

No abstract

The Corded Ware complex represents an archaeologically defined culture whose people inhabited large areas of Europe during the third millennium BC. Although Corded Ware graves are known also from Finnish territory – the northernmost area of Corded Ware expansion – these graves represent a special challenge and methodological problem for archaeological research. This is because unburnt bone material is generally not preserved in the acidic soils of Finland, and Finnish Corded Ware complex graves have typically been recognized mainly due to the occurrence of a Corded Ware assemblage (i. e. complete pottery vessels, adzes and ground-stone axes). Furthermore, since most Finnish Corded Ware grave discoveries have been made during the early and mid-20th century, they generally lack good-quality archaeological documentation. Despite these challenges, new insights into Finnish Corded Ware burials can be gained by thoroughly investigating the region’s burial customs and material culture as an entity and comparing them to the Corded Ware complex of the eastern Baltic region and beyond. Finnish Corded Ware graves not only follow the standard material culture and burial customs of the Central European Corded Ware complex but show additional evidence of wooden chambers and laid-out furs, and they may have occasionally even possessed small mounds. However, even though the material culture of the Finnish graves follows traditions present in the central European Corded Ware complex, the grave custom is far from uniform. Hence, Finnish Corded Ware graves represent a melting pot of ideas, ideologies and connections, likely reflecting differing origins of relocating people. Aside from being influenced by the Corded Ware populations of nearby regions, a close link to contemporary local hunter-gatherers seems to have been present, too.