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Hiroyuki Kagi
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Journal Article

Hydrogen occupation and hydrogen-induced volume expansion in Fe 0.9 Ni 0.1 D x at high P-T conditions

Chikara Shito, Hiroyuki Kagi, Sho Kakizawa, Katsutoshi Aoki, Kazuki Komatsu, Riko Iizuka-Oku, Jun Abe, Hirioyuki Saitoh, Asami Sano-Furukawa, Takanori Hattori
Published: 03 April 2023
American Mineralogist (2023) 108 (4): 659–666.
DOI: https://doi.org/10.2138/am-2022-8348
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Decompression experiments for sulfur-bearing hydrous rhyolite magma: Redox evolution during magma decompression

Satoshi Okumura, Hidemi Ishibashi, Shoichi Itoh, Akimasa Suzumura, Yoshihiro Furukawa, Takahiro Miwa, Hiroyuki Kagi
Published: 01 February 2021
American Mineralogist (2021) 106 (2): 216–225.
DOI: https://doi.org/10.2138/am-2020-7535
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Why Tolbachik Diamonds Cannot be Natural

Konstantin D. Litasov, Hiroyuki Kagi, Tatyana B. Bekker, Yoshiki Makino, Takafumi Hirata, Vadim V. Brazhkin
Published: 01 January 2021
American Mineralogist (2021) 106 (1): 44–53.
DOI: https://doi.org/10.2138/am-2020-7562
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“Kamchatite” diamond aggregate from northern Kamchatka, Russia: New find of diamond formed by gas phase condensation or chemical vapor deposition—Discussion

Konstantin D. Litasov, Tatyana B. Bekker, Hiroyuki Kagi
Published: 01 January 2020
American Mineralogist (2020) 105 (1): 141–143.
DOI: https://doi.org/10.2138/am-2020-7182
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Formation of SiH 4 and H 2 O by the dissolution of quartz in H 2 fluid under high pressure and temperature

Ayako Shinozaki, Hiroyuki Kagi, Naoki Noguchi, Hisako Hirai, Hiroaki Ohfuji, Taku Okada, Satoshi Nakano, Takehiko Yagi
Published: 01 July 2014
American Mineralogist (2014) 99 (7): 1265–1269.
DOI: https://doi.org/10.2138/am.2014.4798
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Merwinite in diamond from São Luiz, Brazil: A new mineral of the Ca-rich mantle environment

Dmitriy A. Zedgenizov, Anton Shatskiy, Alexey L. Ragozin, Hiroyuki Kagi, Vladislav S. Shatsky
Published: 01 February 2014
American Mineralogist (2014) 99 (2-3): 547–550.
DOI: https://doi.org/10.2138/am.2014.4767
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Crystal structure of the high-pressure phase of calcium hydroxide, portlandite: In situ powder and single-crystal X-ray diffraction study

Riko Iizuka, Takehiko Yagi, Kazuki Komatsu, Hirotada Gotou, Taku Tsuchiya, Keiji Kusaba, Hiroyuki Kagi
Published: 01 August 2013
American Mineralogist (2013) 98 (8-9): 1421–1428.
DOI: https://doi.org/10.2138/am.2013.4386
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Hydrous fluid as the growth media of natural polycrystalline diamond, carbonado: Implication from IR spectra and microtextural observations

Hidemi Ishibashi, Hiroyuki Kagi, Haruko Sakuai, Hiroaki Ohfuji, Hirochika Sumino
Published: 01 August 2012
American Mineralogist (2012) 97 (8-9): 1366–1372.
DOI: https://doi.org/10.2138/am.2012.4097
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Kinetics of evaporation of forsterite in vacuum

Kazuhito Ozawa, Hiroko Nagahara, Masana Morioka, Naoko Matsumoto, Ian D. Hutcheon, Takaaki Noguchi, Hiroyuki Kagi
Published: 01 January 2012
American Mineralogist (2012) 97 (1): 80–99.
DOI: https://doi.org/10.2138/am.2012.3750
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Change in compressibility of δ-AlOOH and δ-AlOOD at high pressure: A study of isotope effect and hydrogen-bond symmetrization

Asami Sano-Furukawa, Hiroyuki Kagi, Takaya Nagai, Satoshi Nakano, Satoshi Fukura, Daichi Ushijima, Riko Iizuka, Eiji Ohtani, Takehiko Yagi
Published: 01 August 2009
American Mineralogist (2009) 94 (8-9): 1255–1261.
DOI: https://doi.org/10.2138/am.2009.3109
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Coordination study of rare earth elements on Fe oxyhydroxide and Mn dioxides: Part I. Influence of a multi-electron excitation on EXAFS analyses of La, Pr, Nd, and Sm

Atsuyuki Ohta, Hiroyuki Kagi, Masaharu Nomura, Hiroshi Tsuno, Iwao Kawabe
Published: 01 April 2009
American Mineralogist (2009) 94 (4): 467–475.
DOI: https://doi.org/10.2138/am.2009.2986
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Coordination study of rare earth elements on Fe oxyhydroxide and Mn dioxides: Part II. Correspondence of structural change to irregular variations of partitioning coefficients and tetrad effect variations appearing in interatomic distances

Atsuyuki Ohta, Hiroyuki Kagi, Masaharu Nomura, Hiroshi Tsuno, Iwao Kawabe
Published: 01 April 2009
American Mineralogist (2009) 94 (4): 476–486.
DOI: https://doi.org/10.2138/am.2009.2987
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Influence of multi-electron excitation on EXAFS spectroscopy of trivalent rare-earth ions and elucidation of change in hydration number through the series

Atsuyuki Ohta, Hiroyuki Kagi, Hiroshi Tsuno, Masaharu Nomura, Iwao Kawabe
Published: 01 August 2008
American Mineralogist (2008) 93 (8-9): 1384–1392.
DOI: https://doi.org/10.2138/am.2008.2628
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Pressure-induced change in the compressional behavior of the O-H bond in chrysotile: A Raman high-pressure study up to 4.5 GPa

Tomoyuki Mizukami, Hiroyuki Kagi, Simon R. Wallis, Satoshi Fukura
Published: 01 August 2007
American Mineralogist (2007) 92 (8-9): 1456–1463.
DOI: https://doi.org/10.2138/am.2007.2489
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Generation history of carbonado inferred from photoluminescence spectra, cathodoluminescence imaging, and carbon-isotopic composition

Hiroyuki Kagi, Shuichi Sato, Tasuku Akagi, Hisao Kanda
Published: 01 January 2007
American Mineralogist (2007) 92 (1): 217–224.
DOI: https://doi.org/10.2138/am.2007.1957
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Variation of hydrogen bonded O…O distances in goethite at high pressure

Takaya Nagai, Hiroyuki Kagi, Takamitsu Yamanaka
Published: 01 October 2003
American Mineralogist (2003) 88 (10): 1423–1427.
DOI: https://doi.org/10.2138/am-2003-1005
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Pressure-induced phase transformation of kalicinite (KHCO 3 ) at 2.8 GPa and local structural changes around hydrogen atoms

Hiroyuki Kagi, Takaya Nagai, John S. Loveday, Chisato Wada, John B. Parise
Published: 01 October 2003
American Mineralogist (2003) 88 (10): 1446–1451.
DOI: https://doi.org/10.2138/am-2003-1008
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