Zero thermal expansion in NaZn₁₃-type La(Fe,Si)₁₃ compounds

Abstract

A zero thermal expansion material in a pure form of NaZn13-type La(Fe,Si)13 was fabricated. Through optimizing the chemical composition, an isotropic zero thermal expansion material is achieved. The obtained materials exhibit a low expansion of |α| < 1.0 × 10(-6) K(-1) (α is the coefficient of linear thermal expansion) over a broad temperature range (15-150 K). The present study indicates that the thermal expansion behavior of the NaZn13-type La(Fe,Si)13 compounds depends mainly on the content of Si element. This new material is desirable in many fields of industry as a reliable and low-cost zero thermal expansion material.

Strong Coupling of Magnetism and Lattice Induces Near-Zero Thermal Expansion over Broad Temperature Windows in ErFe 10 V 2− x Mo x Compounds

“…Mainly, CTEs decreased by ∼40% to ∼50% as intermediate contents, yielding near-ZTE properties over a broad temperature range (for 2b). To the best of our knowledge, the near-ZTE-temperature windows are almost the broadest among all the known intermetallic complexes, such as TbCo 1.9 Fe 0.1 (123-307 K), 5 LaFe 10.6 Si 2.4 (15-150 K), 6 and Pr 2 Fe 16 Si (200-340 K), 15 which are even broader than that of Invar alloy (200 to ∼400 K). 16 The temperature-dependence experiments of the cell parameters revealed that ErFe 10 V 1.4 Mo 0.6 possessed an ultralow area NTE inside the ab plane and a normal PTE along the c axis (α c = 4.8 × 10 −6 K −1 , α a/b = −7.48×10 −9 K −1 ).…”

“…To date, besides the conventional Invar alloy, only a few intermetallic compounds have been documented to show ZTE, such as TbCo 1.9 Fe 0.1 (α l = 0.48 × 10 −6 K −1 , 123-307 K), LaFe 11 Si 2 (α l = -0.8× 10 -6 K -1 , 15-150 K), and Ho 2 Fe 16 Cr (α l = 0.43 × 10 −6 K −1 , 123-307 K). [5][6][7][8] Neutron diffraction and magnetic measurements indicated that the amazing phenomena are closely related to magnetic-phase transitions and magnetovolume effects (MVEs). To elaborately compensate MVEs and phonon-induced lattice expansion, the ZTE behaviors are usually limited in a narrow temperature window, even below liquid-nitrogen temperature.…”

Thermal Expansion and Magnetostriction Measurements at Cryogenic Temperature Using the Strain Gauge Method

“…In the last several years, due to the giant magnetocaloric effect (MCE) and the intriguing negative thermal expansion (NTE), NaZn 13 -type compounds LaFe 13−x Al x have aroused extensive attention (Fujieda et al, 2002; Shen et al, 2009; Li et al, 2014; Wang et al, 2015). The MCE of this materials is chiefly due to the itinerant-electron metamagnetic (IEM) transition, i.e., a magnetic-field-induced phase transition from the paramagnetic state to the ferromagnetic state.…”

Low-temperature abnormal thermal expansion property of Mn doped cubic NaZn13-type La(Fe, Al)13 compounds

“…However, the starting NTE operation-temperature window in ferromagnetic (FM) La(Fe, M)13-based compounds is generally above 100 K, which is too high for practical applications in cryogenic engineering. [7,9] Moreover, nearly ZTE behavior could be observed in some of the materials while most of them show relatively narrow ZTE temperature ranges. [13,14] Nevertheless, it has been reported that the LaFe11.4Al1.6 compound shows a slight NTE property in a temperature range 150 -255 K, and exhibits the ZTE behavior in temperature ranges of 5 -150 K and 255 -300 K. [15] Here, we report an effective way to control the ATE behavior shifting towards the lower temperature region and occurring over a large scale by optimizing the chemical composition.…”

“…Therefore the abnormal thermal expansion (ATE) property including zero thermal expansion (ZTE) and negative thermal expansion (NTE) has become an advanced research focus especially in high-precision devices. In recent years, several kinds of materials with ATE property have been discovered, such as LiAlSiO4 (β-eucryptite), ZrW2O8, [3] ScF3, [4,5] PbTio3-based compounds, [6] La(Fe, Si)13-based compounds [7][8][9][10] and some antiperovskite manganese nitrides [2,11] . It is noteworthy that most of ATE materials are tuned to adjust the temperature range of ATE moving towards higher temperature span.…”