Electronic pseudogap-driven formation of new double-perovskite-like borides within the Sc2Ir6-xTxB (T = Pd, Ni; x = 0-6) series.
Electronic pseudogap-driven formation of new double-perovskite-like borides within the Sc2Ir6-xTxB (T = Pd, Ni; x = 0-6) series.
复制标题
Sc2Ir6-xTxB(T = Pd,Ni;x = 0-6)系列中新型双钙钛矿型硼化物的电子赝能隙驱动形成
DOI:
10.1021/acs.inorgchem.5b00292
复制
发表时间:
2015
影响因子:
4.6
通讯作者:
B. P. T. Fokwa
中科院分区:
文献类型:
--
作者:
M. Hermus;J. P. Scheiffers;R. St. Touzani;B. P. T. Fokwa
Analysis of the electronic density of states of the hypothetical ternary double-perovskite-like phases “Sc2T6B (T = Ir, Pd, Ni)” reveals the presence of deep and large pseudogaps between 61 and 68 valence electrons (VE) as well as a strong peak at 69 VEs. Subsequently, crystal orbital Hamilton population (COHP) bonding analysis shows that the heteroatomic T–B and Sc–T interactions are optimized in Sc2Ir6B (63 VE) but not in “Sc2Pd6B (69 VE)” and “Sc2Ni6B (69 VE)”, thus indicating less stability for these VE-richer phases. These findings point out the possibility of discovering new double-perovskite-like borides through chemical substitution and lead to the study of the Sc2Ir6–xPdxB and Sc2Ir6–xNixB (x= 0–6; VE = 63–69) series, for which powder samples and single crystals were synthesized by arc melting the elements. Superstructure reflections were observed in the powder diffractograms of Sc2Ir6–xPdxB and Sc2Ir6–xNixB forx= 0–5 and VE = 63–68, thereby showing that these phases crystallize in the double-perovskite-like Ti2Rh6B-type structure (space groupFm3̅m,Z= 4). Single-crystal and Rietveld refinement results confirm and extend these findings because Pd (or Ni) is found to mix exclusively with Ir in all quaternary compositions. Forx= 6, no superstructure reflections were observed, in accordance with the theoretical expectation for the 69 VE phases.
登录
查看更多内容
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
I. Zeiringer;J. Sereni;M. G. Berisso;K. Yubuta;P. Rogl;A. Grytsiv;E. Bauer
通讯作者:
E. Bauer
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
K. Yubuta;A. Nomura;K. Nakajima;T. Shishido
通讯作者:
T. Shishido
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
H. Takei;N. Kobayashi;H. Yamauchi;T. Shishido;T. Fukase
通讯作者:
T. Fukase
DOI:
--
发表时间:
1994
期刊:
影响因子:
--
作者:
V. N. Yeremenko;V. G. Khorujaya;P. S. Martsenyuk
通讯作者:
P. S. Martsenyuk
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
K. Yubuta;A. Nomura;T. Yamamura;T. Shishido
通讯作者:
T. Shishido