{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T13:01:01Z","timestamp":1790773261571,"version":"4.1.0"},"reference-count":42,"publisher":"AIP Publishing","issue":"9","funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["24KJ1090"],"award-info":[{"award-number":["24KJ1090"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"publisher","award":["24H00266"],"award-info":[{"award-number":["24H00266"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"<jats:p>Internally resistance-heated diamond anvil cell (IHDAC) enables long-duration, thermally stable experiments at high pressure and high temperature conditions and is, therefore, well suited for physical property measurements implicating the Earth\u2019s deep interior. A potential limitation of conventional direct current (DC) operation is the formation of a steady electric potential gradient within the sample, which can induce electromigration and thereby drive time-dependent compositional changes during heating. To address this issue, here we introduce alternating current (AC) operation in IHDAC experiments. We demonstrate the influence of constant voltage bias by comparing DC- and AC-IHDAC for Fe\u2013H and Fe\u2013C alloys. In the Fe\u2013H system, ramp laser heating under constant voltage bias produces a reduction in lattice volume, consistent with substantial hydrogen loss. In contrast, 1-kHz AC-internal heating does not show apparent hydrogen depletion up to \u223c2350\u00a0K and allows stable tracking of the hcp\u2013(hcp + fcc)\u2013fcc transition, consistent with reported phase relations. For Fe\u20134 wt.\u2009% C, cross-sectional chemical analyses of recovered samples reveal carbon inhomogeneity after constant-voltage-biased heating, whereas AC heating yields uniform Fe and C distributions. These results demonstrate that AC-IHDAC can effectively reduce the net electrical bias in IHDAC experiments and suppress electromigration-driven redistribution of light elements, thereby improving chemical stability in high-P\u2013T measurements on Fe\u2013light element alloys.<\/jats:p>","DOI":"10.1063\/5.0331139","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T12:38:55Z","timestamp":1790771935000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Alternating-current internally resistive heating in diamond anvil cells"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4946-2006","authenticated-orcid":false,"given":"Yoshihiro","family":"Nagaya","sequence":"first","affiliation":[{"name":"Department of Earth and Planetary Sciences, Institute of Science Tokyo , Meguro, Tokyo 152-8551,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5330-1155","authenticated-orcid":false,"given":"Qingchun","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, Institute of Science Tokyo , Meguro, Tokyo 152-8551,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6107-8720","authenticated-orcid":false,"given":"Kenji","family":"Ohta","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, Institute of Science Tokyo , Meguro, Tokyo 152-8551,","place":["Japan"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,9,30]]},"reference":[{"issue":"9","key":"2026093008385096900_c1","doi-asserted-by":"publisher","first-page":"645","DOI":"10.1038\/s43017-021-00203-6","article-title":"Light elements in the Earth\u2019s core","volume":"2","year":"2021","journal-title":"Nat. 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