Search for structural phase transitions in the molecular phases of bromine and iodine under high pressure

我们已经成功地采取粉末X-射线衍射图案的固体溴在高压下与氦压力介质。所获得的图案显示没有证据的结构相变周围的25和65 GPa，这已经提出了在以前的高压实验。然而，我们的数据在原子位置坐标中仍然包含相当大的误差。这来自于大粉末微晶散射的衍射强度的不确定性。因此，我们不能得出结论，从目前的实验数据在分子相的溴结构相变的情况下。

We have succeeded in taking powder x-ray diffraction patterns of solid bromine under high pressure with a He-pressure medium. The obtained patterns showed no evidence of structural phase transitions around25and65GPa, which have been proposed in previous high-pressure experiments. Our data, however, still contain sizable errors in atomic positional coordinates. This comes from the uncertainty in diffraction intensity scattered by large powder crystallites. Accordingly, we cannot conclude the absence of structural phase transitions in the molecular phase of bromine from the present experimental data.