Interaction Of Beryllium Research Articles

Compatibility of stainless steels and lithiated ceramics with beryllium

The introduction of beryllium as a neutron multiplier in ceramic blankets of thermonuclear fusion reactors may give rise to the following compatibility problems: (i) oxidation of Be by ceramics (lithium aluminate and silicates) or by water vapour; (ii) interaction between beryllium and austenitic and martensitic steels. The studies were done in contact tests under vacuum and in tests under wet sweeping helium. The contact tests under vacuum have revealed that the interaction of beryllium with ceramics seems to be low up to 700°C, the interaction of beryllium with steels is significant and is characterized by the formation of a diffusion layer and of a brittle Be-Fe-Ni compound. With type 316 L austenitic steel, this interaction appears quite large at 600°C whereas it is noticeable only at 700°C with martensitic steels. The experiments carried out with sweeping wet helium at 600°C have evidenced a slight oxidation of beryllium due to water vapour which can be enhanced in the front of uncompletely dehydrated ceramics.

Measurement ofD meson production in 200 GeV π−-Be interactions

We have measured the differential and total cross sections ofD meson production in 200 GeV π−-beryllium interactions, using a sample of 48 fully reconstructed and nearly background-freeD mesons in the decay channelsK∓π±,K∓π±π± andK∓π∓π±π±. A single electron trigger has been used to select events containing a pair of charmed particles. A vertex telescope of 6 silison microstrip detectors allowed the reconstruction of tracks of charged secondaries and the reconstruction of primary and decay vertices with high precision. The ratio of branching fractions for\(\mathop {D^0 }\limits^{( - )} \to K^ \mp \pi ^ \pm \) to\(\mathop {D^0 }\limits^{( - )} \to K^ \mp \pi ^ \mp \pi ^ \pm \pi ^ \pm \), and an upper limit for\(D^0 - \bar D^0 \) mixing are presented.

Binary and Ternary Complexes of Interest to Environmental Systems. Part-II : Interaction of Beryllium(II) with a Mixture of Ligands and Failure in Forming Mixed Ligand Complexes

Binary and Ternary Complexes of Interest to Environmental Systems. Part-II : Interaction of Beryllium(II) with a Mixture of Ligands and Failure in Forming Mixed Ligand Complexes

The interaction of beryllium with molten sodium fluoride and UF4-NaF salt mixtures

The interaction of beryllium with molten sodium fluoride and UF4-NaF salt mixtures

The infra-red spectra of complexes of beryllium with tri- n-octylphosphine oxide and di(2-ethylhexyl) phosphoric acid

The interaction of beryllium with tri- n-octylphosphine oxide (TOPO) and with di(2-ethylhexyl) phosphoric acid (HDEHP) has been studied by i.r. spectroscopy. For beryllium nitrate -TOPO solutions, the small shift (48 cm −1) in vPO and the small splitting (195 cm −1) of the nitrate band in relation to the large ionic potential ( e r ) of the beryllium ion are explained on the basis of steric hindrance. A similar situation is found in the aluminium nitrate-TOPO system. In the spectrum of Be(DEHP) 2(HDEHP) 2 a very broad band in the region 1700−800 cm −1 indicates the presence of strong, symmetrical or near-symmetrical hydrogen bonding. Be(DEHP) 2 occurs at higher beryllium loadings and bands at 763 and 685 cm −1 are shown to be BeO vibrational modes. The system Fe 3+-HDEHP shows similar features and studies have been made of the effect of deuteration and low temperatures on the spectrum of Fe(HEHP) 3(HDEHP) 3.

Protection of beryllium metal by anodic films

A preliminary study was undertaken to find a means to prevent or retard beryllium interaction with UO/sub 2/ and corrosion by CO/sub 2/. lt was found that a beryllium wafer anodized to form a thin film covering of BeO did not interact with uranium and offered good corrosion resistance to CO/sub 2/. (M.C.G.)