ABSTRACT We investigated the optical properties (absorption, luminescence and Raman spectra) of nanopolycrystalline diamond (NPD) aiming at exploring its capabilities as a pressure sensor and as a pressure-cell anvil for combined X-ray/neutron and optical studies. Notably, we analysed the Raman peak shift and broadening with pressure using a Moissanite Anvil Cell (MAC). The results are compared with those obtained in a DAC, where Raman signals from NPD chips and diamond anvils strongly overlap. Its pressure behaviour in the hydrostatic and non-hydrostatic regimes were investigated. We showed that the nanopolycrystalline structure induces remarkable differences in the peak shift and broadening between NPD and natural type IIa single-crystal diamond, making NPD suitable as pressure gauge for pressure determination and testing hydrostaticity of pressure transmitting medium.

中文翻译：

---

在高压实验中利用纳米多晶金刚石的光学特性

摘要我们研究了纳米多晶金刚石 (NPD) 的光学特性（吸收、发光和拉曼光谱），旨在探索其作为压力传感器和压力单元砧的能力，用于结合 X 射线/中子和光学研究。值得注意的是，我们使用 Moissanite Anvil Cell (MAC) 分析了拉曼峰位移和压力加宽。将结果与 DAC 中获得的结果进行比较，其中来自 NPD 芯片和金刚石砧的拉曼信号强烈重叠。研究了它在流体静力学和非流体静力学状态下的压力行为。我们发现纳米多晶结构在 NPD 和天然 IIa 型单晶金刚石之间引起峰位移和展宽的显着差异，