Near-zero thermal expansion in β-CuZnV₂O₇ in a large temperature range

Abstract

We report a new type of near-zero thermal expansion material β-CuZnV2O7 in a large temperature range from 173 K to 673 K. It belongs to a monoclinic structure (C2/c space group) in the whole temperature range. No structural phase transition is observed at atmospheric pressure based on the x-ray diffraction and Raman experiment. The high-pressure Raman experiment demonstrates that two structural phase transitions exist at 0.94 GPa and 6.53 GPa, respectively. The mechanism of negative thermal expansion in β-CuZnV2O7 is interpreted by the variations of the angles between atoms intuitively and the phonon anharmonicity intrinsically resorting to the negative Grüneisen parameter.

Exploring negative thermal expansion materials with bulk framework structures and their relevant scaling relationships through multi-step machine learning

“…The training data contains nearly 200 NTE materials from the published literature 16–127 and about 230 positive thermal expansion (PTE) data with the same structures or elements as NTE materials. To improve the reliability of the prediction capability, we employed the three-step ML method with data augmentation and cross-validation.…”

Nanostructured Silver Films with a Low Coefficient of Thermal Expansion as a Promising Material for Nanoelectronics

“…In this regard, materials with controlled CTE, which usually state themselves complex composites, become promising. [ 22,23 ] However, the complex structure of composites with zero or negative CTE significantly narrows the prospects for their application. The obtaining of materials with a given CTE can be eased by the using of the size factor, which in the nanometer range often has a decisive influence on thermal expansion.…”

Isotropic negative thermal expansion and its mechanism in tetracyanidoborate salt CuB(CN)4

“…After the discovery that ZrW 2 O 8 displays strong negative thermal expansion (NTE) over a wide temperature range, [1,2] the interest in NTE has increased considerably due to its promising applications in different engineering fields from fiber optics coatings, high performance fuel cell cathodes to tooth fillings. [3,4] Since then different NTE materials were found out [5][6][7][8] and classified into two classes according to the NTE mechanism: [9][10][11][12][13] phonons driven open-framework materials, such as oxides, [1,3,14,15] fluorides, [16,17] cyanides/Prussian blue analogues (PBAs) [18][19][20][21] and MOFs; [22,23] electronic-related driven materials, such as magnetovolume effect in manganese nitrides [24,25] and Invar alloys, [26,27] ferroelectrovolume effect in PbTiO 3 , [28] charge transfer in BiNiO 3 , [29] metal-insulating transition in Ca 2 RuO 4 . [30] Other examples can be found in the review papers.…”