Diamond as pressure sensor in high‐pressure Raman spectroscopy using sapphire and other gem anvil cells

Abstract

We propose a new Raman pressure scale based on the shift with pressure of the fundamental Raman band of micrometer-sized diamonds. First, we confirmed that the pressure slope of the triply degenerate diamond phonon behaves in a similar fashion to that of the bulk. Our measurements were calibrated Raman against the Sm:YAG fluorescence pressure scale up to 5 GPa using a gasketed sapphire anvil cell. The most relevant features regarding the design of the anvil cell are briefly outlined. Measurements were performed under hydrostatic conditions using 4 : 1 methanol-ethanol as pressure-transmitting medium. The calibration pressures according to the relationship p.GPa/ = 0.356[n.cm −1 / − 1332.3] are considered to be accurate within about 0.1 GPa. The convenience of using micrometer-sized diamonds as pressure sensors in Raman studies using gem anvil devices is demonstrated with several examples.

Raman spectroscopy of aqueous methanol solutions under pressure

“…Our high-pressure Raman spectra were measured using a sapphire anvil cell described elsewhere [3]. The liquid samples were loaded using aluminium gaskets and our maximum working pressure was about 10 kbar.…”

Raman study of methane clathrate hydrates under pressure: new evidence for the metastability of structure II

“…The pressure is measured using the Raman peak of diamond. 23,24 The precision of pressure measurement is commonly around 39 MPa.…”

Properties of Sizeable [n]Cycloparaphenylenes as Molecular Models of Single‐Wall Carbon Nanotubes Elucidated by Raman Spectroscopy: Structural and Electron‐Transfer Responses under Mechanical Stress

“…[20] We have therefore performed series of pressure-dependent Raman experiments using an anvil cell device [21] on the largest and smallest members, [6]CPP to [12]CPP; maximum pressures around 8-10 GPa were achieved. [20] We have therefore performed series of pressure-dependent Raman experiments using an anvil cell device [21] on the largest and smallest members, [6]CPP to [12]CPP; maximum pressures around 8-10 GPa were achieved.…”