Electronic and mechanical properties of 5d transition metal mononitrides via first principles

Electronic and mechanical properties of 5d transition metal mononitrides via first principles
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通过第一原理研究 5d 过渡金属单氮化物的电子和机械性能

DOI:
10.1016/j.jssc.2008.07.022
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发表时间:
2008-10
影响因子:
3.3
通讯作者:
Wu, Zhijian
Wu, Zhijian
中科院分区:
化学3区
文献类型:
--
作者:
Zhao, Erjun;Wu, Zhijian

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利用密度泛函理论系统地研究了从LaN到AuN的5d过渡金属单氮化物的电子和力学性质。对于每种氮化物,考虑六种结构,即,岩盐、锌尖晶石、CsCl、纤锌矿、NiAs和WC结构。在所考虑的结构中,岩盐结构对于LaN、HfN和AuN是最稳定的,WC结构对于TaN是最稳定的,NiAs结构对于WN是最稳定的,纤锌矿结构对于ReN、OsN、IrN和PtN是最稳定的。每种氮化物最稳定的结构是机械稳定的。从LaN到AuN,生成焓增加。对于LaN、HfN和TaN,所有结构的生成焓都为负值,而从WN到AuN,除了ReN中的纤锌矿结构外,其余结构的生成焓都为正值。计算的态密度表明它们都是金属的。NiAs结构中ReN的体积模量最大,为418GPa。最大剪切模量261GPa来自于WC结构中的TaN。趋势进行了讨论。
The electronic and mechanical properties of 5d transition metal mononitrides from LaN to AuN are systematically investigated by use of the density-functional theory. For each nitride, six structures are considered, i.e., rocksalt, zinc blende, CsCl, wurtzite, NiAs and WC structures. Among the considered structures, rocksalt structure is the most stable for LaN, HfN and AuN, WC structure for TaN, NiAs structure for WN, wurtzite structure for ReN, OsN, IrN and PtN. The most stable structure for each nitride is mechanically stable. The formation enthalpy increases from LaN to AuN. For LaN, HfN and TaN, the formation enthalpy is negative for all the considered structures, while from WN to AuN, except wurtzite structure in ReN, the formation enthalpy is positive. The calculated density of states shows that they are all metallic. ReN in NiAs structure has the largest bulk modulus, 418GPa. The largest shear modulus 261GPa is from TaN in WC structure. Trends are discussed.
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