Giant negative thermal expansion in Zn2-Cu P2O7 ceramics via microstructure effect

Shi, Naike; Song, Yuzhu; Zhou, Chang; Fan, Longlong

doi:10.1016/j.ceramint.2022.08.343

Cited by 7 publications

(2 citation statements)

References 36 publications

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“…will shrink or expand during the temperature change, which will cause the difference between the linear thermal expansion of the bulk sample and the intrinsic thermal expansion of the powder sample, which can also be found in Ca 2 Ru 1−x M x O 4 54 and Zn 1.96 Cu 0.04 P 2 O 7 . 55 The XRD data were refined to determine the crystal structures at different compositions (Figures S4 and S5) and to examine the impact of the lattice distortion on the thermal expansion behavior. The ionic radii of Ta 5+ and V 5+ ions are 0.64 and 0.355 Å, respectively, while those of the Ti 4+ and Mo 6+ ions are 0.605 and 0.41 Å, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Due to the anisotropy of the grain thermal expansion, the microstructures (including holes, cracks, etc.) will shrink or expand during the temperature change, which will cause the difference between the linear thermal expansion of the bulk sample and the intrinsic thermal expansion of the powder sample, which can also be found in Ca 2 Ru 1– x M x O 4 and Zn 1.96 Cu 0.04 P 2 O 7 …”

Section: Resultsmentioning

confidence: 99%

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Control of Thermal Expansion in TaVO₅ by Double Chemical Substitution

et al. 2023

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The control of thermal expansion is an important and challenging issue. Focusing attention on the class of AMO 5 negative thermal expansion (NTE) materials, an approach to control their thermal expansion is still missing. In this work, the thermal expansion of TaVO 5 has been controlled from strong negative to zero to positive by double chemical substitution, i.e., Ti and Mo replace Ta and V elements, respectively. A joint study of temperature-dependent X-ray diffraction, X-ray photoelectron spectroscopy, and first-principles calculations has been performed to investigate the thermal expansion mechanism. With the increasing substitution of Ti and Mo atoms, the valence state always remains balanced, and the volume decreases together with a lattice distortion, which leads to the suppression of the NTE. Lattice dynamics calculations confirm that the negative Gruneisen parameters of the low-frequency modes weaken and the thermal vibrations of the polyhedral units diminish after the substitution of Ti and Mo atoms. The present work successfully achieves a tailored thermal expansion in TaVO 5 and draws a possible way to control the thermal expansion of other NTE materials.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%