scholarly journals Negative thermal expansion and electronic structure variation of chalcopyrite type LiGaTe2

RSC Advances ◽  
2018 ◽  
Vol 8 (18) ◽  
pp. 9946-9955 ◽  
Author(s):  
V. V. Atuchin ◽  
Fei Liang ◽  
S. Grazhdannikov ◽  
L. I. Isaenko ◽  
P. G. Krinitsin ◽  
...  

The LiGaTe2 crystals were grown by the Bridgman–Stockbarger technique and the cell parameter dependence on temperature in the range of 303–563 K was evaluated by the X-ray diffraction analysis and first principles calculations.

2019 ◽  
Vol 75 (5) ◽  
pp. 562-567 ◽  
Author(s):  
Jiliang Zhang ◽  
Yong-Mook Kang ◽  
Guangcun Shan ◽  
Svilen Bobev

The crystal structure of the gadolinium iron bismuthide Gd6FeBi2 has been characterized by single-crystal X-ray diffraction data and analyzed in detail using first-principles calculations. The structure is isotypic with the Zr6CoAl2 structure, which is a variant of the ZrNiAl structure and its binary prototype Fe2P (Pearson code hP9, Wyckoff sequence g f d a). As such, the structure is best viewed as an array of tricapped trigonal prisms of Gd atoms centered alternately by Fe and Bi. The magnetic-ordering temperature of this compound (ca 350 K) is much higher than that of other rare-earth metal-rich phases with the same or related structures. It is also higher than the ordering temperature of many other Gd-rich ternary phases, where the magnetic exchange is typically governed by Ruderman–Kittel–Kasuya–Yosida (RKKY) interactions. First-principles calculations reveal a larger than expected Gd magnetic moment, with the additional contribution arising from the Gd 5d electrons. The electronic structure analysis suggests strong Gd 5d–Fe 3d hybridization to be the cause of this effect, rather than weak interactions between Gd and Bi. These details are of importance for understanding the magnetic response and explaining the high ordering temperature in this material.


CrystEngComm ◽  
2018 ◽  
Vol 20 (35) ◽  
pp. 5123-5126 ◽  
Author(s):  
Dinabandhu Das ◽  
Leonard J. Barbour

Anomalous thermal expansion of a new diyn-diol molecule was studied by means of variable-temperature single-crystal X-ray diffraction. Analysis of the unit cell axes as a function of temperature shows that the material experiences uniaxial negative thermal expansion. Packing analysis of the crystal structures reveals twisting of the cyclopentyl moiety relative to the diyne spine with increasing temperature.


2019 ◽  
Vol 1195 ◽  
pp. 859-862
Author(s):  
Rajitha Rajan ◽  
T.R. Ravindran ◽  
R. Raja Madhavan ◽  
R. Asuvathraman ◽  
Sharat Chandra ◽  
...  

2014 ◽  
Vol 52 (12) ◽  
pp. 1025-1029
Author(s):  
Min-Wook Oh ◽  
Tae-Gu Kang ◽  
Byungki Ryu ◽  
Ji Eun Lee ◽  
Sung-Jae Joo ◽  
...  

2015 ◽  
Vol 56 (3) ◽  
pp. 492-496 ◽  
Author(s):  
A. A. Lavrentyev ◽  
B. V. Gabrelian ◽  
P. N. Shkumat ◽  
I. Ya. Nikiforov ◽  
O. V. Parasyuk ◽  
...  

2019 ◽  
Vol 470 ◽  
pp. 607-612 ◽  
Author(s):  
Martin Magnuson ◽  
Grzegorz Greczynski ◽  
Fredrik Eriksson ◽  
Lars Hultman ◽  
Hans Högberg

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