{"doi":"10.1029/2000jb900318","title":"Quasi‐hydrostatic compression of magnesium oxide to 52 GPa: Implications for the pressure‐volume‐temperature equation of state","abstract":"<jats:p>Room temperature static compression of MgO (periclase) was performed under nearly hydrostatic conditions using energy dispersive synchrotron X‐ray diffraction in a diamond anvil cell with methanol‐ethanol (to 10 GPa) or helium (to 52 GPa) as a pressure‐transmitting medium. Highly precise cell parameters were determined with an average relative standard deviation 〈Δ<jats:italic>a</jats:italic>/<jats:italic>a</jats:italic>〉 = 0.0003 over all the experimental pressure range. Fixing the bulk modulus <jats:italic>K</jats:italic><jats:sub>0<jats:italic>T</jats:italic></jats:sub> = 160.2 GPa, a fit of the data to the third‐order Birch‐Murnaghan equation of state yields: <jats:italic>V</jats:italic><jats:sub>0</jats:sub> = 74.71±0.01 Å<jats:sup>3</jats:sup>, (∂<jats:italic>K</jats:italic><jats:sub>0<jats:italic>T</jats:italic></jats:sub>/∂<jats:italic>P</jats:italic>)<jats:sub><jats:italic>T</jats:italic></jats:sub> = 3.99±0.01. A fit of different P‐V‐T datasets, ranging to 53 GPa and 2500 K, to a Birch‐Murnaghan‐Debye thermal equation of state constrained the Grüneisen parameter γ<jats:sub>0</jats:sub> = 1.49±0.03, but not its volume dependence <jats:italic>q</jats:italic>, which was constrained to 1.65±0.4 by thermodynamic theory. A model based on a constant value of <jats:italic>q</jats:italic> cannot explain the ultrahigh pressure (<jats:italic>P</jats:italic> = 174–203 GPa) shock compression data. We developed a model in which <jats:italic>q</jats:italic> decreases with compression from 1.65 at 0.1 MPa to 0.01 at 200 GPa. This model, within the framework of the Mie‐Grüneisen‐Debye assumptions, satisfactorily describes the low‐pressure static data (〈Δ<jats:italic>V</jats:italic>/<jats:italic>V</jats:italic>〉 = 0.4% to 53 GPa) and the high‐pressure Hugoniot data (〈Δ<jats:italic>V</jats:italic>/<jats:italic>V</jats:italic>〉 &lt;1% to 203 GPa). Average values of the thermal expansion coefficient α range between 14.1±2.8 and 16.3 ± 2.7 × 10<jats:sup>−6</jats:sup> K<jats:sup>−1</jats:sup> at <jats:italic>P</jats:italic> = 174–203 GPa. The pressure dependence of the melting temperature yields an initial pressure derivative ∂<jats:italic>T<jats:sub>m</jats:sub></jats:italic>/∂<jats:italic>P</jats:italic> = 98 K/GPa. Our analysis shows that it is possible to develop a simple model of the volume dependence of the Grüneisen parameter that can successfully describe the P‐V‐T equation of state of MgO from ambient conditions to 203 GPa and 3663 K.</jats:p>","journal":"Journal of Geophysical Research: Solid Earth","year":2001,"id":27259,"datarank":16.25329171479771,"base_score":6.075346031088684,"endowment":6.075346031088684,"self_citation_contribution":0.9113019046633027,"citation_network_contribution":15.341989810134407,"self_endowment_contribution":0.9113019046633027,"citer_contribution":15.341989810134407,"corpus_percentile":null,"corpus_rank":null,"citation_count":434,"citer_count":200,"citers_with_citation_signal":200,"citers_with_endowment":200,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":155711,"name":"Chang‐Sheng Zha","orcid":null,"position":1,"is_corresponding":false},{"id":155712,"name":"Thomas S. Duffy","orcid":null,"position":2,"is_corresponding":false},{"id":155713,"name":"Russell J. Hemley","orcid":null,"position":3,"is_corresponding":false},{"id":155714,"name":"Ho‐kwang Mao","orcid":null,"position":4,"is_corresponding":false},{"id":155710,"name":"Sergio Speziale","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"base_score":6.075346031088684,"endowment":6.075346031088684,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"18998881","pmcid":null,"openalex_id":"https://openalex.org/W1968115886","authors":[],"funders":[],"total_grants":0,"fwci":10.1886,"citation_percentile":0.98813828,"influential_citations":43,"citation_trend":[{"year":2012,"count":13},{"year":2013,"count":13},{"year":2014,"count":13},{"year":2015,"count":27},{"year":2016,"count":17},{"year":2017,"count":20},{"year":2018,"count":13},{"year":2019,"count":17},{"year":2020,"count":11},{"year":2021,"count":19},{"year":2022,"count":16},{"year":2023,"count":11},{"year":2024,"count":12},{"year":2025,"count":8},{"year":2026,"count":4}],"oa_status":"closed","license":"http://onlinelibrary.wiley.com/termsAndConditions#vor","oa_locations":[{"url":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2000JB900318","host_type":"publisher"},{"url":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2000JB900318","host_type":"publisher"},{"url":"https://doi.org/10.1029/2000jb900318","host_type":"journal"}],"fields_of_study":["High-pressure geophysics and materials","Advanced Chemical Physics Studies","Energetic Materials and Combustion","Geology","Materials Science","Physics"],"mesh_terms":[],"keywords":["Equation of state","Bulk modulus","Debye model","Thermodynamics","Thermal expansion","Periclase","Materials science","Hydrostatic equilibrium","Compression (physics)","Atmospheric temperature range","Volume (thermodynamics)","Grüneisen parameter","Analytical Chemistry (journal)","Magnesium","Physics","Chemistry","Metallurgy"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Affordable and clean energy"}],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-06-08T17:08:49.199899Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}