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Ultra-Hard Materials
New ultra-hard materials with superior properties to diamond are continuously being investigated and potentially new superhard materials are presently being designed and examined not only for scientific interest, but also for commercial usage. Different techniques, both theoretical and experimental, are employed in an attempt to replace diamond for applications where abrasive wear resistance and enhanced thermal stability are of great importance. This collection on Ultra-hard Materials provides a valuable forum where scientists, engineers, and practitioners in the field shared their most recent, novel findings, and understanding of fundamentals of ultra-hard materials.
Guest Editors: Yann Le Godec and Vladimir Solozhenko

EDITORIALS
Vladimir L. Solozhenko; Yann Le Godec
Physics of Matter under Extreme Conditions
Shock-induced phase transition of g-C3N4 to a new C3N4 phase
Available to Purchase
Xin Gao; Hao Yin; Pengwan Chen; Jianjun Liu
TUTORIALS
Yann Le Godec; Alexandre Courac; Vladimir L. Solozhenko
Physics of Materials, Including Electrical, Thermal, Mechanical and Other Properties
A model of hardness and fracture toughness of solids
Available to Purchase
Efim Mazhnik; Artem R. Oganov
Physics of Materials, Including Electrical, Thermal, Mechanical and Other Properties
Mechanical properties of ultra-hard nanocrystalline cubic boron nitride
Available to Purchase
Vladimir L. Solozhenko; Volodymyr Bushlya; Jinming Zhou
Physics of Materials, Including Electrical, Thermal, Mechanical and Other Properties
Order versus disorder: In situ high-pressure structural study of highly polymerized three-dimensional C60 fullerite
Available to Purchase
A. G. Lyapin; Y. Katayama; V. V. Brazhkin
PERSPECTIVES
Alexander G. Kvashnin; Zahed Allahyari; Artem R. Oganov
Physics of Materials, Including Electrical, Thermal, Mechanical and Other Properties
Stable and hard hafnium borides: A first-principles study
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Congwei Xie; Qi Zhang; Hayk A. Zakaryan; Hao Wan; Ning Liu; Alexander G. Kvashnin; Artem R. Oganov
Physics of Matter Under Extreme Conditions
Theoretical phase diagram of boron carbide from ambient to high pressure and temperature
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Antoine Jay; Olivier Hardouin Duparc; Jelena Sjakste; Nathalie Vast
Physics of Materials, Including Electrical, Thermal, Mechanical and Other Properties
First-principles studies of superhard BC8N structures
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Yufei Gao; Pan Ying; Yingju Wu; Shuai Chen; Mengdong Ma; Linyan Wang; Zhisheng Zhao; Dongli Yu
Physics of Matter Under Extreme Conditions
Pressure dependence of the silicon carbide synthesis temperature
Available to Purchase
S. Limandri; G. Garbarino; D. Sifre; M. Mezouar; V. Galván Josa
PERSPECTIVES
Vadim V. Brazhkin; Vladimir L. Solozhenko
Thin Films, Interfaces, and Surfaces
Stability of SiC and SiN interfaces in titanium carbide and nitride based heterostructures
Available to Purchase
V. I. Ivashchenko; P. E. A. Turchi; Leonid Gorb; Jerzy Leszczynski; N. R. Medukh; R. V. Shevchenko
Physics of Materials, Including Electrical, Thermal, Mechanical and Other Properties
Simple and accurate model of fracture toughness of solids
Available to Purchase
Haiyang Niu; Shiwei Niu; Artem R. Oganov