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Metallocenes are promising single-source precursors for the synthesis of transition-metal carbides and hydrides due to their atomic-scale mixing of metal, carbon, and hydrogen. In this study, we investigated the high-pressure and high-temperature (HP–HT) behavior of group 8 metallocenes, ferrocene [Fe(C5H5)2] and ruthenocene [Ru(C5H5)2], at pressures up to 68 GPa using a laser-heated diamond anvil cell. Optical and Raman spectroscopic observations revealed that both complexes undergo a transition to an opaque state above ~20 GPa, enabling efficient laser coupling. In situ synchrotron X-ray diffraction measurements demonstrated that HP–HT treatment of ferrocene and ruthenocene above 30 GPa yielded the formation of the face-centered cubic phase, which indicates that the decomposition of metallocenes under extreme conditions facilitates the stabilization of exotic, light-element-incorporated metallic phases. Our findings highlight the potential of organometallic precursors in exploring the structural diversity of metal-light element systems under ultrahigh pressures.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: Metallocenes, high pressure synthesis, laser-heated diamond-anvil cell, high pressure in situ measurement

Date published: 2026-12-31

Publisher: Taylor & Francis

Journal:

• Science and Technology of Advanced Materials (ISSN: 14686996) vol. 27 issue. 1 2688058

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Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6363

First published URL: https://doi.org/10.1080/14686996.2026.2688058

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Updated at: 2026-06-24 11:49:59 +0900

Published on MDR: 2026-06-24 14:27:48 +0900