Journal Article

PUBDB-2024-01003

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hardness of polycrystalline SiO$_2$ coesite

Kulik, E. (Corresponding author)Extern*DESY* ; Nishiyama, N.DESY* ; Higo, Y. ; Gaida, N. A. ; Katsura, T.

2019
Soc. Westerville, Ohio

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Please use a persistent id in citations: doi:10.1111/jace.16243

Abstract: We measured elastic moduli and hardness of polycrystalline SiO$_2$ coesite. Translucent polycrystalline bulk coesite with a grain size of about 10 micrometers was fabricated at 8 GPa and 1600°C using a Kawai-type multianvil apparatus. The obtained bulk and shear moduli are 94(1) and 60.2(3) GPa, respectively. The resulting Vickers and Knoop hardness values are 10.9(7) and 9.6(4) GPa, respectively, at an indentation load of 4.9 N. Coesite is as hard as other fourfold coordinated silica materials such as quartz and densified silica glasses. The hardness values of coesite and the fourfold coordinated silica materials are about one-third of those of sixfold coordinated silica materials, stishovite, and seifertite, which are the hardest known oxides.

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Contributing Institute(s):

1. PETRA III Extension (FS-PEX)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)

Experiment(s):

1. Measurement at external facility

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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