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Title: Synthesis, Hardness, and Electronic Properties of Stoichiometric VN and CrN

Journal Article · · Crystal Growth and Design
 [1];  [2];  [3];  [4];  [5];  [6];  [4]
  1. Univ. of Nevada, Las Vegas, NV (United States); Sichuan Univ., Chengdu (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Nevada, Las Vegas, NV (United States)
  5. Arizona State Univ., Tempe, AZ (United States)
  6. 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 μm. 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. The relatively low hardness in VN indicates that the metallic bonding prevails due to the overfilled metallic σ 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 Tc ≈ 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 TN = 240(5) K and is accompanied by a ~40% drop in electrical resistivity. In addition, 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, Vol. 16, Issue 1; ISSN 1528-7483
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

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Cited By (7)

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Strain stiffening, high load-invariant hardness, and electronic anomalies of boron phosphide under pressure journal January 2020
Oxidation behaviour of composite CrN/(Cr,V)N coatings with different contents of vanadium induced by UV nanosecond laser pulses journal April 2018
X-ray absorption spectroscopy study of cobalt mononitride thin films journal December 2019
Revealing the Unusual Rigid Boron Chain Substructure in Hard and Superconductive Tantalum Monoboride journal March 2019
Finite-temperature elastic constants of paramagnetic materials within the disordered local moment picture from ab initio molecular dynamics calculations journal August 2016
In-plane anisotropy and twin boundary effects in vanadium nitride under nanoindentation journal July 2017