Nishiyama, Norimasa, Langer, Julia, Sakai, Takeshi, Kojima, Yohei, Holzheid, Astrid, Gaida, Nico A., Kulik, Eleonora, Hirao, Naohisa, Kawaguchi, Saori I., Irifune, Tetsuo and Ohishi, Yasuo (2018) Phase relations in silicon and germanium nitrides up to 98 GPa and 2400°C. Journal of the American Ceramic Society . DOI 10.1111/jace.16063.

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Abstract

Phase relations in silicon and germanium nitrides (Si3N4 and Ge3N4) were investigated using a Kawai‐type multianvil apparatus and a laser‐heated diamond anvil cell combined with a synchrotron radiation. The pressure‐induced phase transition from the β to γ (cubic spinel‐type structure) phase was observed in both compositions. We observed the coexistence of the β and γ phases in Si3N4 at 12.4 GPa and 1800°C, while the appearance of single phase γ‐Ge3N4 was observed at pressures above 10 GPa. Our observations under higher pressures revealed that γ‐Si3N4 and γ‐Ge3N4 have wide stability fields and no postspinel transition was observed up to 98 GPa and 2400°C in both compositions. Using the room‐temperature compression curves of these materials, the bulk moduli (K0) and their pressure derivatives (K′0) were determined: K0 = 317 (16) GPa and K′0 = 6.0 (8) for γ‐Si3N4; K0 = 254 (13) GPa and K′0 = 6.0 (7) for γ‐Ge3N4.

Document Type:	Article
Research affiliation:	Kiel University Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence
Refereed:	Yes
Open Access Journal?:	No
Publisher:	John Wiley & Sons: Blackwell Publishing
Projects:	Future Ocean
Date Deposited:	16 Jan 2019 12:14
Last Modified:	23 Sep 2019 19:55
URI:	https://oceanrep.geomar.de/id/eprint/45392

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