The core of the earth consists almost exclusively of iron. The iron atoms in a piece of iron, in room temperature, are packed according to a certain structure, in this case called body centered cubic or bcc. This means the atoms are relatively sparsely packed.

When the piece of iron is exposed to greater pressure, the iron atoms place themselves differently in relation to each other and take on another kind of structure, so-called hexagonal close packed, or hcp. The become more densely packed, which seems natural, and it has long been assumed that the higher the temperature and pressure iron is exposed to, the more stable the hpc structure will be.

Researchers from the department KTH Materials Science maintain, however, that this not the case. With the help of computer simulations, they have now shown that iron, unexpectedly, reverts to bcc structure at extreme temperatures and pressures. Exactly why this occurs is the next question for science to tackle.

Research into the inner parts of the earth has enjoyed a great boom over the last few years, largely owing to the fact that equipment has not been available until today to simulate the conditions down there.

It is pure research, and the discoveries are thus far difficult to evaluate in terms of money or practical applications, but it might be possible to use increased knowledge of the construction of the earth in geology to understand the significance of the core of the earth in earthquakes or volcano eruptions.

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