Heterogeneous Structure of Amorphous Materials

Terauchi, Hikaru; Iida, Satoshi; Tanabe, Kazuhiro; Hida, Moritaka; Kamijo, Nagao; Osamura, Kōzō; Takashige, Masaaki; Nakamura, Terutaro

doi:10.1143/jpsj.52.3454

Cited by 28 publications

(5 citation statements)

References 19 publications

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“…The decrease of the signal from next-nearest ions corresponds to the decrease in correlation between Yb and next-nearest ions. Such a phenomenon is well known in amorphous materials[17,18].The peaks of Abs[F (R)] for all samples at 1.0-2.0 Å are attributed to neighbouring oxygen ions. The Yb-O distributions in both SrZr 0.95 Yb 0.05 O 3 and SrZr 0.9 Yb 0.1 O 3 have a side peak with a strong intensity as marked with arrows in figures 3(b) and (c).…”

supporting

confidence: 55%

Local structure around Yb in SrZr_1-xYb_xO₃

Kamishima

Ohta

Chiba

et al. 2001

J. Phys.: Condens. Matter

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Local structures around Yb ions in the proton conductor Yb-doped SrZrO3 have been investigated at room temperature by the EXAFS (extended x-ray absorption fine structure) technique. The radial structure functions from the Zr K edge in SrZrO3, SrZr0.95Yb0.05O3 and SrZr0.9Yb0.1O3 and the Yb LIII edge in Yb2O3 show clear contributions by next-nearest ions at 3.0-4.0 Å, while those from the Yb LIII edge in SrZr0.95Yb0.05O3 and SrZr0.9Yb0.1O3 are mainly constructed by a first-nearest signal. Moreover, the nearest Yb-O distributions at 1.0-2.0 Å have a side peak with a strong intensity in both SrZr0.95Yb0.05O3 and SrZr0.9Yb0.1O3. It is shown from the analyses of the side peak that the nearest Yb-O bonds consist of two distances (1.96 and 2.18 Å). Two structural models around the Yb ion have been suggested and discussed from these results.

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supporting

confidence: 55%

Local structure around Yb in SrZr_1-xYb_xO₃

Kamishima

Ohta

Chiba

et al. 2001

J. Phys.: Condens. Matter

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“…The formed amorphous regions generally do not have a sharp interface, the transition may exhibit peculiarities of spinodal decomposition [8,9]. Structure changes in metallic glasses before the crystallization onset were discovered in a large number of alloys [10][11][12][13][14][15][16][17][18]. A lot of works [19][20][21][22][23][24][25][26] are devoted to the study of the separation of the amorphous phase and heterogeneous amorphous structure formation.…”

Section: Structural Changes Occurring During Heating and Deformationmentioning

confidence: 99%

“…Thus, short-range order in the amorphous phase, of course, depends on the chemical composition, and it changes with the composition change. An amorphous structure can change significantly with the change in the component concentration; for example, the structure of amorphous (Zr 0.667 Ni 0.333 ) 1-x B x alloy changes with boron concentration change from 0 to 25 at.% [12]. It was shown that short range order type changes when x ≈ 0.05.…”

Section: Structural Changes Occurring During Heating and Deformationmentioning

confidence: 99%

Specific Features of Structure Transformation and Properties of Amorphous-Nanocrystalline Alloys

Аронин

Abrosimova

2020

Metals

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This work is devoted to a brief overview of the structure and properties of amorphous-nanocrystalline metallic alloys. It presents the current state of studies of the structure evolution of amorphous alloys and the formation of nanoglasses and nanocrystals in metallic glasses. Structural changes occurring during heating and deformation are considered. The transformation of a homogeneous amorphous phase into a heterogeneous phase, the dependence of the scale of inhomogeneities on the component composition, and the conditions of external influences are considered. The crystallization processes of the amorphous phase, such as the homogeneous and heterogeneous nucleation of crystals, are considered. Particular attention is paid to a volume mismatch compensation on the crystallization processes. The effect of changes in the amorphous structure on the forming crystalline structure is shown. The mechanical properties in the structure in and around shear bands are discussed. The possibility of controlling the structure of fully or partially crystallized samples is analyzed for creating new materials with the required physical properties.

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“…In some cases, the appearance of heterogeneities in the structure was found after various external influences: heat, irradiation, and others [61][62][63][64][65]. A lot of information about heteroge-neities in the amorphous phase was obtained using the method of small-angle X-ray scattering [66][67][68][69][70]. It is interesting to note that the occurrence of heterogeneities may be related to the composition of the amorphous phase [56].…”

Section: Heterogeneities In Amorphous Structurementioning

confidence: 99%

“…This difference is connected with opportunity of implementing a diffusion mass transport in different temperature conditions. As noted above, the results, showing the development of heterogeneities in an amorphous matrix, were obtained using small-angle X-ray scattering method as well [63,66,99,[102][103][104]. Changes in the structure of the amorphous phase do not necessarily have the character of a separation at heat treatment.…”

Section: Amorphous Ni 70mentioning

confidence: 99%