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- W4305058194 abstract "Negative thermal expansion (NTE) in trifluorides of rare earth elements (REEs – R) is considered. The electronic structure of R divides RF3 into two homological series: 1) short ScF3, YF3, LaF3 of d-elements and 2) long LaF3 and 14 fluorides of 4f-elements (lanthanides - Ln) from CeF3 to LuF3. The type of NTE is different for different series. The Periodic Table of RF3 (RF3 are in the locations of elements R in the Periodic Table of Elements) sets the periodicity of NTE types for the first time. In the short series only ScF3 (ReO3 type) has NTE-I in a wide temperature range. Eight LnF3 (out of 15 RF3) have polymorphic transition (PolTr). The only PolTr β- (β-YF3 type) → t- (LaF3 type) of three possible (β- → t-; β- →α-YF3; t- → α-YF3) gives denser high-temperature t-modification. It is evidence of a giant NTE-II. The unit cell parameters of the model crystal 61(58Ce0.564Gd0.5)F3 («pseudo 61PmF3») were measured in situ by X-ray diffraction to calculate Vform of PmF3. The unit cell parameters of β- «pseudo PmF3» were obtained. PmF3 belongs to the structural subgroup (SSG) B of LnF3. PolTrs in these four LnF3 are accompanied by a giant NTE-II up to ∼4.7 %. These LnF3 form a new group of single component materials with non-adjustable NTE-II parameters. Multicomponent materials with adjustable NTE-II parameters arise in LnF3-Ln’F3 systems." @default.
- W4305058194 created "2022-10-14" @default.
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- W4305058194 date "2023-01-01" @default.
- W4305058194 modified "2023-09-30" @default.
- W4305058194 title "The periodicity of negative thermal expansion in rare earth trifluorides" @default.
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- W4305058194 doi "https://doi.org/10.1016/j.jssc.2022.123666" @default.
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