In:
Materials Horizons, Royal Society of Chemistry (RSC), Vol. 9, No. 8 ( 2022), p. 2207-2214
Abstract:
Negative and zero thermal expansion (NTE and ZTE) materials are widely adopted to eliminate the harmful effect from the “heat expansion and cool contraction” effect and frequently embrace novel fundamental physicochemical mechanisms. To date, the manipulation of NTE and ZTE materials has mainly been realized by chemical component regulation. Here, we propose another method by making use of the anisotropy of thermal expansion in noncubic single crystals, with maximal tunability from the integration of linear NTE, ZTE and positive thermal expansion (PTE). We demonstrate this concept in borate optical crystals of AEB 2 O 4 (AE = Ca or Sr) to make the light transmission temperature-independent by counterbalancing the thermal expansion and thermo-optics coefficient. We further reveal that such a unique thermal expansion behavior in AEB 2 O 4 arises from the synergetic thermal excitation of bond stretching in ionic [AEO 8 ] and rotation between covalent [BO 3 ] groups. This work has significant implications for understanding the thermal excitation of lattice vibrations in crystals and promoting the functionalization of anomalous thermal expansion materials.
Type of Medium:
Online Resource
ISSN:
2051-6347
,
2051-6355
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2744250-0