The Structure of Barium in the hcp Phase Under High Pressure

Recent experimental results on two hcp phases of barium under high pressure show interesting variation of the lattice parameters. They are here interpreted in terms of electronic structure calculation by using the LMTO method and generalized pseudopotential theory (GPT) with a NFE-TBB approach. In phase II the dramatic drop in c/a is an instability analogous to that in the group II metals but with the transfer of s to d electrons playing a crucial role in Ba. Meanwhile in phase V, the instability decrease a lot due to the core repulsion at very high pressure. PACS numbers: 62.50+p, 61.66Bi, 71.15.Ap, 71.15Hx, 71.15LaComment: 29 pages, 8 figure

Ansvarlig forskningspraksis, forskningsfrihed og uvildighed

The scope of rules on scientific ethics, responsible research practice, etc. has grown steadily over recent decades. These are mostly about what researchers should not and what they should do. In this article, I will look at the principles from a different perspective: Freedom of research is part of good scientific practice. Violating research freedom is detrimental to research. First, I outline very briefly what is meant by professions. Next follows an account of what is generally understood by research freedom. The thesis is that responsible research practice holds a tension between restrictions and freedom