Negative thermal expansion in magnetic materials

The role of average atomic volume in predicting negative thermal expansion: The case of REFe(CN)6

“…S1, Tables S1 and S2). This directly indicated the relevant difference between LaFe(CN) 6 (strong NTE) and LuFe(CN) 6 S3 and S4). Here, we adopted NPD measurements to extract the "apparent" bond lengths of Lu-N and Fe-C in LuFe(CN) 6 (Fig.…”

“…As for other PBAs, the transverse ADPs of N atoms are much larger than those of C atoms. This also suggests that the transverse thermal vibration of N and C atoms is the driving force for NTE in REFe(CN) 6 . Compared with the value of ADPs between LaFe(CN) 6 (strong NTE) and LuFe(CN) 6 , the transverse ADPs of CN atoms in strong NTE LaFe(CN) 6 are much larger than those in LuFe(CN) 6 (the detailed information of NPD structure refinements of LaFe(CN) 6 and LuFe(CN) 6 is shown in Fig.…”

“…The role of average atomic volume in predicting negative thermal expansion: The case of REFe(CN) 6 Qilong Gao 1* , Qiang Sun 1 , Alessandro Venier 3 , Andrea Sanson 3 , Qingzhen Huang 4 , Yu Jia 5,1 , Erjun liang 1 and Jun Chen 2* Negative thermal expansion (NTE), as an abnormal physical behavior, has been followed by scientists' attention over the past 30 years, due to its fascinating physical mechanisms and the prospect of high-precision thermal expansion control [1][2][3][4][5]. Although some NTE materials (alloys [6], cyanides [7], fluorides [8][9][10], nitrides [11], oxides [12,13], MOFs [14][15][16], etc.) have been found, their number and variety are still very small, limiting their applications.…”

Biaxial negative thermal expansion in Zn[N(CN)2]2

“…Since the report on the NTE of ZrW 2 O 8 in 1996, 4 NTE has been widely studied, and it has been observed in alloys, oxides, fluorides, nitrides, etc . 5,6 Notably, many of the framework structure materials also exhibit NTE properties driven by low-frequency phonons. Research on them is mainly focused on oxides, fluorides, cyanides and metal–organic frameworks (MOFs), like ZrW 2 O 8 , 4,7 ScF 3 , 8 Zn(CN) 2 , 9,10 and MOF-5.…”

Tunable negative thermal expansion in La(Fe, Si)13/resin composites with high mechanical property and long-term cycle stability

“…This unusual volumetric effect can be used to regulate the coefficient of thermal expansion (CTE) and produce ZTE composites by mixing them with PTE materials. So far, a few kinds of materials have been reported as potential NTE material candidates, such as ZrW 2 O 8 [2] , antiperovskite manganese nitrides [3] , AgB(CN) 4 [4] , MM′X compounds [5] , β-Cu 1.8 Zn 0.2 V 2 O 7 [6] , (Hf, Nb)Fe 2 [7] , ScF 3 -based compounds [8] , and PbTiO 3 -based compounds [9] . Nonetheless, most NTE materials cannot be used as thermal expansion compensators in practice because of their low NTE coefficient, limited NTE temperature window, and poor mechanical properties.…”