Synthesis, Hardness, and Electronic Properties of Stoichiometric VN and CrN
Journal Article
·
· Crystal Growth and Design
- Univ. of Nevada, Las Vegas, NV (United States); Sichuan Univ., Chengdu (China)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of Nevada, Las Vegas, NV (United States)
- Arizona State Univ., Tempe, AZ (United States)
- Sichuan Univ., Chengdu (China)
Here, we report synthesis of single-crystal VN and CrN through high-pressure ionexchange reaction routes. The final products are stoichiometric and have crystallite sizes in the range of 50-120 mu m. We also prepared VN and TiN crystals using high-pressure sintering of nitride powders. On the basis of single-crystal indentation testing, the determined asymptotic Vickers hardness for TiN, VN, and CrN is 18 (1), 10 (1), and 16 (1) GPa, respectively. Moreover, the relatively low hardness in VN indicates that the metallic bonding prevails due to the overfilled metallic a bonds, although the cation-anion covalent hybridization in this compound is much stronger than that in TiN and CrN. All three nitrides are intrinsically excellent metals at ambient pressure. In particular, VN exhibits superconducting transition at T-c approximate to 7.8 K, which is slightly lower than the reported values for nitrogen-deficient or crystallinedisordered samples due to unsuppressed "spin fluctuation" in the well-crystallized stoichiometric VN. The magnetostructural transition in CrN correlates with a metal metal transition at T-N = 240(5) K and is accompanied by a similar to 40% drop in electrical resistivity. Additionally, more detailed electronic properties are presented with new insights into these nitrides.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Nevada, Las Vegas, NV (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC05-00OR22725; NA0001982
- OSTI ID:
- 1261496
- Alternate ID(s):
- OSTI ID: 1332351
- Journal Information:
- Crystal Growth and Design, Journal Name: Crystal Growth and Design Journal Issue: 1 Vol. 16; ISSN 1528-7483
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magnetic properties of solid solutions in the systems TiN--CrN and VN--CrN
Structure and mechanical properties of polycrystalline CrN/TiN superlattices
Journal Article
·
Fri Aug 01 00:00:00 EDT 1975
· Inorg. Mater. (USSR) (Engl. Transl.); (United States)
·
OSTI ID:7185472
Structure and mechanical properties of polycrystalline CrN/TiN superlattices
Journal Article
·
Tue Sep 01 00:00:00 EDT 1998
· Journal of Vacuum Science and Technology, A
·
OSTI ID:641611