Design of insulating ceramic cells for in situ high-pressure nuclear magnetic resonance

In situ high-pressure nuclear magnetic resonance (HP-NMR) provides a groundbreaking means for exploring state transitions of matter under extreme conditions. However, metal components in diamond anvil cells (DACs) severely hinder the acquisition and transmission of high-frequency electromagnetic waves. Here, we report the realization of a DAC fabricated from 5% yttria-stabilized zirconia ceramics, which is attributed to the application of precision ceramic processing technology and the unique structural design. Building on this insulating press, the quality factor of the radio frequency (RF) circuit has doubled, thereby enabling the in situ HP-NMR signal measurement for aluminum powder under pressures up to 8.5 GPa. This clearly shows that such cells not only enhance the resonant characteristics of RF circuits but also possess mechanical stability comparable to conventional cells. This study lays a foundation for the future development of high-pressure science under extreme conditions.