The densest boron phase (2.52 g cm-3) was produced as a result of the synthesis under pressures above 9 GPa and temperatures up to ∼1800 °C. The x-ray powder diffraction pattern and the Raman spectra of the new material do not correspond to those of any known boron phases. A new high-pressure high-temperature boron phase was defined to have an orthorhombic symmetry (Pnnm (No. 58)) and 28 atoms per unit cell.
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机译：在高于9 GPa的压力和高达1800°C的温度下进行合成后，生成了最致密的硼相（2.52 g cm -3 ）。新材料的X射线粉末衍射图和拉曼光谱与任何已知的硼相都不相同。定义了一种新的高压高温硼相，具有正交晶对称性（Pnnm（第58号）），每个晶胞具有28个原子。
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