{"id":2312,"date":"2026-02-16T13:59:08","date_gmt":"2026-02-16T04:59:08","guid":{"rendered":"https:\/\/supraceramics.jp\/?p=2312"},"modified":"2026-02-16T13:59:08","modified_gmt":"2026-02-16T04:59:08","slug":"publication-chem-mater-motohashi-sugimoto-et-al-unconventional-oxygen-storage-release-properties-of-melilite-type-ba2mnge2o7%ce%b4-associated-with-complex-structural-transformation","status":"publish","type":"post","link":"https:\/\/supraceramics.jp\/en\/2026\/02\/2312\/","title":{"rendered":"Publication | Chem. Mater. (Motohashi, Sugimoto, et al.) \u201cUnconventional Oxygen Storage\/Release Properties of Melilite-Type Ba<sub>2<\/sub>MnGe<sub>2<\/sub>O<sub>7+\u03b4<\/sub> Associated with Complex Structural Transformation\u201d"},"content":{"rendered":"<p>Unconventional Oxygen Storage\/Release Properties of Melilite-Type Ba<sub>2<\/sub>MnGe<sub>2<\/sub>O<sub>7+\uf064<\/sub> Associated with Complex Structural Transformation<\/p>\n<p>Kosaku Ohishi, Satoshi Ogawa, Hisanori Yamane, Saburo Hosokawa, Zi Lang Goo, Kunihisa Sugimoto, Miwa Saito, Teruki Motohashi<\/p>\n<p>Here, we report the synthesis and characterization of melilite-type A2MnC2O7 (A = Sr, Ba; C = Si, Ge) and the discovery of its unconventional oxygen storage and release properties. Unlike conventional Mn-containing oxygen storage materials driven by the Mn2+\/Mn3+ redox couple, Ba2MnGe2O7+\u03b4 (BMG) does not require highly reducing atmospheres for oxygen release and exhibits reversible oxygen storage\/release under oxygen-rich conditions at moderate temperatures (200\u2013500 \u00b0C). Comprehensive compositional and structural analyses utilizing X-ray absorption spectroscopy, synchrotron in situ powder X-ray diffraction, single-crystal X-ray diffraction, and powder neutron diffraction revealed that the oxygen storage\/release processes involve changes in the local coordination environment. Specifically, MnO4 tetrahedra in the reduced phase change into MnO5 trigonal bipyramids in the oxidized phase, accompanied by a distinct transformation from the fundamental melilite-type structure of Ba2MnGe2O7 (tetragonal, space group P4\u030521m) to a 5a \u00d7 5a \u00d7 1c superstructure of Ba2MnGe2O7.455(4) (tetragonal, P4\u0305). BMG exhibits a maximum oxygen storage capacity of \u03b4 \u2248 0.45 and, notably, develops a distinctive blue color upon oxygen storage. This characteristic response suggests promising potential for various oxygen-related applications, such as oxygen sensors and oxygen-sensitive inorganic pigments.<br \/>\n<a href=\"https:\/\/doi.org\/10.1021\/acs.chemmater.5c02228\"><br \/>\n<em>Chem. Mater.<\/em> <b>2026<\/b>, <i>38<\/i>, 3, 1084-1093. (DOI: 10. 10.1021\/ acs.chemmater.5c02228)<br \/>\n<\/a><\/p>\n<p><a href=\"\u201dhttps:\/\/www.kanagawa-u.ac.jp\/news\/article0101_02641\u201d\">\u30d7\u30ec\u30b9\u30ea\u30ea\u30fc\u30b9\uff08\u795e\u5948\u5ddd\u5927\u5b66\uff09<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Unconventional Oxygen Storage\/Release Properties of Melilite-Type Ba2MnGe2O7+\uf064 Associated with Complex Structural Transformation Kosaku Ohishi, Satoshi Ogawa, Hisanori Yamane, Saburo Hosokawa, Zi Lang Goo, Kunihisa Sugimoto, Miwa Saito, Teruki Motohashi Here, we report the synthesis and characterization of melilite-type A2MnC2O7 (A = Sr, Ba; C = Si, Ge) and the discovery of its unconventional oxygen storage [&hellip;]<\/p>\n","protected":false},"author":222414606,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_themeisle_gutenberg_block_has_review":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_locale":"en_US","_original_post":"https:\/\/supraceramics.jp\/?p=2310","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[124830],"tags":[],"class_list":["post-2312","post","type-post","status-publish","format-standard","hentry","category-news","en-US"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pe2JgX-Bi","jetpack-related-posts":[{"id":2310,"url":"https:\/\/supraceramics.jp\/2026\/02\/2310\/","url_meta":{"origin":2312,"position":0},"title":"Publication | Chem. Mater. (Motohashi, Sugimoto, et al.) \u201cUnconventional Oxygen Storage\/Release Properties of Melilite-Type Ba2MnGe2O7+\u03b4 Associated with Complex Structural Transformation\u201d","author":"shorike","date":"2026\u5e742\u670816\u65e5","format":false,"excerpt":"\u5171\u540c\u7814\u7a76\u6210\u679c\uff1a\u9178\u7d20\u3092\u5438\u53ce\u30fb\u653e\u51fa\u3057\u3066\u9752\u8272\u30fb\u767d\u8272\u306b\u5909\u5316\u3059\u308b\u30bb\u30e9\u30df\u30c3\u30af\u30b9\u3092\u767a\u898b\uff08A01\u672c\u6a4b\u3001B01\u6749\u672c\uff09 Unconventional Oxygen Storage\/Release Properties of Melilite-Type Ba2MnGe2O7+\uf064 Associated with Complex Structural Transformation Kosaku Ohishi, Satoshi Ogawa, Hisanori Yamane, Saburo Hosokawa, Zi Lang Goo, Kunihisa Sugimoto, Miwa Saito, Teruki Motohashi \u30e1\u30ea\u30e9\u30a4\u30c8\u578b\u69cb\u9020\u3092\u3082\u3064\u9178\u7d20\u8caf\u8535\u6750\u6599Ba2MnGe2O7+\u03b4\u304c\u5f93\u6765\u306b\u306a\u3044\u7279\u7570\u306a\u9178\u7d20\u5438\u53ce\u653e\u51fa\u7279\u6027\u3092\u793a\u3059\u3053\u3068\u3092\u767a\u898b\u3057\u3001\u653e\u5c04\u5149X\u7dda\u5438\u53ce\u5206\u5149\u6cd5\u3001\u653e\u5c04\u5149\u305d\u306e\u5834X\u7dda\u56de\u6298\u3001\u5358\u7d50\u6676X\u7dda\u56de\u6298\u3001\u7c89\u672b\u4e2d\u6027\u5b50\u56de\u6298\u3092\u7528\u3044\u305f\u5148\u7aef\u5206\u6790\u306b\u3088\u308a\u3001\u9178\u7d20\u5438\u53ce\u653e\u51fa\u306b\u4f34\u3046\u8907\u96d1\u306a\u7d50\u6676\u69cb\u9020\u5909\u5316\u3092\u89e3\u660e\u3057\u307e\u3057\u305f\u3002 \u5f93\u6765\u306e\u30de\u30f3\u30ac\u30f3\u7cfb\u9178\u7d20\u8caf\u8535\u6750\u6599\u3067\u306f\u9178\u7d20\u3092\u653e\u51fa\u3059\u308b\u305f\u3081\u306b\u6c34\u7d20\u306a\u3069\u306e\u9084\u5143\u96f0\u56f2\u6c17\u304c\u5fc5\u8981\u3067\u3057\u305f\u304c\u3001\u672c\u6750\u6599\u306f\u5927\u6c17\u4e2d\u3084\u9178\u7d20\u96f0\u56f2\u6c17\u4e2d\u3067\u3082\u6e29\u5ea6\u5909\u5316\u3060\u3051\u3067\u53ef\u9006\u7684\u306b\u9178\u7d20\u5438\u53ce\u653e\u51fa\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u9178\u7d20\u5438\u53ce\u653e\u51fa\u306b\u4f34\u3044\u9752\u8272\u21d4\u767d\u8272\u3068\u53ef\u9006\u7684\u306b\u5909\u8272\u3059\u308b\u30e6\u30cb\u30fc\u30af\u306a\u7279\u5fb4\u3082\u898b\u51fa\u3057\u3001\u9178\u7d20\u30bb\u30f3\u30b5\u30fc\u3084\u9178\u7d20\u611f\u5fdc\u6027\u7121\u6a5f\u9854\u6599\u3068\u3057\u3066\u306e\u5fdc\u7528\u304c\u671f\u5f85\u3055\u308c\u307e\u3059\u3002 Chem. Mater. 2026, 38, 3, 1084-1093. (DOI: 10. 10.1021\/acs.chemmater.5c02228) \u30d7\u30ec\u30b9\u30ea\u30ea\u30fc\u30b9\uff08\u795e\u5948\u5ddd\u5927\u5b66\uff09","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2304,"url":"https:\/\/supraceramics.jp\/en\/2026\/02\/2304\/","url_meta":{"origin":2312,"position":1},"title":"Publication | ACS Catal. (Katagiri, Maeda et al.) \u201cProtective Reaction Fields Created by Deep Eutectic Solvents against Molecular Oxygen in CO2 Reduction over Ru(II)-Complex\/Ag\/Polymeric Carbon Nitride Hybrid Photocatalysts\u201d","author":"shorike","date":"2026\u5e742\u670812\u65e5","format":false,"excerpt":"Photocatalytic CO2 reduction into value-added fuels has garnered considerable attention as a strategy to mitigate global warming and fossil fuel depletion. However, under practical aerobic conditions, photocatalytic activity often declines dramatically due to undesirable O2-photoreduction. Here, we show that deep eutectic solvents (DESs) can provide a protective reaction field against\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2056,"url":"https:\/\/supraceramics.jp\/en\/2025\/06\/2056\/","url_meta":{"origin":2312,"position":2},"title":"Publication | J. Mater. Chem. A (Motohashi, Kageyama, Takeiri et al.) \u201cThermally stable proton-conducting oxy-hydroxides synthesized in concentrated water vapor\u201d","author":"shorike","date":"2025\u5e746\u670810\u65e5","format":false,"excerpt":"Thermally stable proton-conducting oxy-hydroxides synthesized in concentrated water vapor Kenji Arai, Yoko Kokubo, Yusuke Asai, Satoshi Ogawa, *Miwa Saito, Maria Kirsanova, Iaroslava Shakhova, Artem Abakumov, Fumitaka Takeiri, Hiroshi Kageyama, *Teruki Motohashi The diverse functionalities of (oxy-)hydroxides, such as electrocatalytic activity of transition-metal oxy-hydroxides in the oxygen evolution reaction (OER) and\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2175,"url":"https:\/\/supraceramics.jp\/en\/2025\/09\/2175\/","url_meta":{"origin":2312,"position":3},"title":"Publication | Inorg. Chem. (Motohashi, Nambu, Kimoto, Sugimoto, Inada et al.) \u201cA Sr-Ga Oxy-Hydroxide with High Thermal Stability: Unraveling Its Characteristic Hydrogen-Bond Network\u201d","author":"shorike","date":"2025\u5e749\u670826\u65e5","format":false,"excerpt":"A Sr-Ga Oxy-Hydroxide with High Thermal Stability: Unraveling Its Characteristic Hydrogen-Bond Network Yusuke Asai, Yuto Nishihara, Yoko Kokubo, Kenji Arai, Kosaku Ohishi, Satoshi Ogawa, Miwa Saito, Yusuke Nambu, Maxim Avdeev, Koji Kimoto, Zi Lang Goo, Kunihisa Sugimoto, Miki Inada, Katsuro Hayashi, Teruki Motohashi Oxy-hydroxides represent potential proton carriers for solid\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":549,"url":"https:\/\/supraceramics.jp\/2023\/05\/549\/","url_meta":{"origin":2312,"position":4},"title":"Publication | Adv. Sci. (Yamamoto, et al.)  \u201cEmergence of dynamically-disordered phases during fast oxygen deintercalation reaction of layered perovskite\u201d","author":"shorike","date":"2023\u5e745\u67088\u65e5","format":false,"excerpt":"\u5c64\u72b6\u9178\u5316\u7269\u306b\u304a\u3051\u308b\u9ad8\u901f\u9178\u7d20\u8131\u96e2\u53cd\u5fdc\u306b\u304a\u3051\u308b\u52d5\u7684\u7121\u79e9\u5e8f\u76f8\u51fa\u73fe\uff08C01\u5c71\u672c\u3089\uff09 Emergence of dynamically-disordered phases during fast oxygen deintercalation reaction of layered perovskite Takafumi Yamamoto, Shogo Kawaguchi, Taiki Kosuge, Akira Sugai, Naoki Tsunoda, Yu Kumagai, Kosuke Beppu, Takuya Ohmi, Teppei Nagase, Kotaro Higashi, Kazuo Kato, Kiyofumi Nitta, Tomoya Uruga, Seiji Yamazoe, Fumiyasu Oba, Tsunehiro Tanaka, Masaki Azuma, Saburo Hosokawa \u5c64\u72b6\u30da\u30ed\u30d6\u30b9\u30ab\u30a4\u30c8\u9244\u9178\u5316\u7269Sr\u2083Fe\u2082O\u2087\u208b\u03b4\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1853,"url":"https:\/\/supraceramics.jp\/en\/2024\/07\/1853\/","url_meta":{"origin":2312,"position":5},"title":"Publication | Inorg. Chem. (Maeda, Tanaka, Ishiwari, Yamada et al.) \u201cLead(II)-Based Coordination Polymer Exhibiting Reversible Color Switching and Selective CO2 Photoreduction Properties\u201d","author":"shorike","date":"2024\u5e747\u670811\u65e5","format":false,"excerpt":"Lead(II)-Based Coordination Polymer Exhibiting Reversible Color Switching and Selective CO2 Photoreduction Properties Chomponoot Suppaso, Ryohei Akiyoshi, Hiroki Yamada, Yoshinobu Kamakura, Fumitaka Ishiwari, Kazuyoshi Ogasawara, Akinori Saeki, Daisuke Tanaka and Kazuhiko Maeda Herein, we report a new photofunctional Pb\u2013S-based coordination polymer (CP) with the formula [Pb(ATAT)(OAc)]n (ATAT = 3-amino-5-mercapto-1,2,4-triazole, OAc =\u2026","rel":"","context":"In &quot;News&quot;","block_context":{"text":"News","link":"https:\/\/supraceramics.jp\/en\/category\/news\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2312","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/users\/222414606"}],"replies":[{"embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/comments?post=2312"}],"version-history":[{"count":1,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2312\/revisions"}],"predecessor-version":[{"id":2315,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/posts\/2312\/revisions\/2315"}],"wp:attachment":[{"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/media?parent=2312"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/categories?post=2312"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/supraceramics.jp\/wp-json\/wp\/v2\/tags?post=2312"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}