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superlattice structures

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Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003733
EISBN: 978-1-62708-177-1
...Abstract Abstract Superlattice is an ordered array of atoms that occur during their rearrangement from random site locations in the disordered solution to specific lattice sites in the ordered structure during phase transformation. This article provides a description of antiphase boundaries...
Book Chapter

Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006229
EISBN: 978-1-62708-163-4
.... This article describes the order-disorder transformation that typically occurs on cooling from a disordered solid solution to an ordered phase. It provides a table that lists selected superlattice structures and alloy phases that order according to each superlattice. The article informs that spinodal...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001260
EISBN: 978-1-62708-170-2
... superlattice structure is λ = λ A + λ B . Multiple-layer alloys often exhibit a spatially periodic compositional wave throughout the film, rather than the discrete interface depicted between each lamella. In short, multiple-layer alloy plating combines the best attributes of electroplating—high...
Image
Published: 01 December 2004
Fig. 2 AuCu II structure: a one-dimensional, long-period superlattice, with antiphase boundaries at intervals of five unit cells of the disordered state More
Image
Published: 01 December 2004
Fig. 2 Unit cells of (a) the disordered CuAu face-centered cubic solution at elevated temperatures and (b) the ordered CuAu I structure representing the L1 0 superlattice More
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001775
EISBN: 978-1-62708-178-8
... alternating layered structures of fundamental interest and importance for potential application in electronic and optical devices. Lattice matching of heteroepitaxy has been emphasized in the materials selection for superlattice layers. However, high-quality superlattices can also be grown from lattice...
Book Chapter

Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0006544
EISBN: 978-1-62708-183-2
...Abstract Abstract The crystal structure of a material is an important aspect of corrosion and oxidation processes. This article provides a general introduction to the crystal structure of materials, providing information on the crystal systems, lattice dimensions, nomenclature, and solid...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003084
EISBN: 978-1-62708-199-3
... of a superperiod formed by long-period ordering depends on the alloy system and the composition within the system. Figure 7 shows an AuCu II structure having a one-dimensional long-range superlattice, with boundaries between the antiphase domains at intervals of five unit cells of the disordered state...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006637
EISBN: 978-1-62708-213-6
... of strained layered superlattices. Superlattices are alternating layered structures of fundamental interest and importance for potential application in electronic and optical devices. Lattice matching of heteroepitaxy has been emphasized in the materials selection for superlattice layers. However, high...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006655
EISBN: 978-1-62708-213-6
... form, LEED can be used to test for the existence of overlayer phases having a two-dimensional crystal structure different from the surface on which they are adsorbed and to test whether a surface phase is ordered or disordered. Although LEED is the best known and most widely used surface...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001769
EISBN: 978-1-62708-178-8
... of various crystallographic defects in the periodic arrangement of surface atoms. In its most elementary form, LEED can be used to test for the existence of overlayer phases having a two-dimensional crystal structure different from the surface on which they are adsorbed and to test whether a surface phase...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003251
EISBN: 978-1-62708-199-3
...Abstract Abstract X-ray diffraction (XRD) is the most extensively used method for identifying and characterizing various aspects of metals related to the arrangements and spacings of their atoms for bulk structural analysis. XRD techniques are also applicable to ceramics, geologic materials...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006681
EISBN: 978-1-62708-213-6
... diffraction, and spectrometry techniques with data analysis. electron diffraction transmission electron microscopy crystal structure Overview Introduction Microstructure observation is an essential approach for materials characterization, which is primarily performed by using light optical...
Book Chapter

Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003722
EISBN: 978-1-62708-177-1
... is proportionately larger, and the crystal is said to be an ordered superstructure or superlattice. Alternatively, the ordering of atoms that have previously been randomly distributed in a solid solution may occur with a lowering of the crystal symmetry of the structure but without multiplication of the length...
Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001102
EISBN: 978-1-62708-162-7
... quite extensively in the 1950s and 1960s, following the discovery of unusual dislocation structures and mechanical behavior associated with ordered lattices ( Ref 1 , 2 , 3 , 4 ). Deformation in ordered alloys is controlled by the glide of superlattice or paired dislocations, as illustrated in Fig...
Book Chapter

Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006292
EISBN: 978-1-62708-163-4
...Abstract Abstract This article defines crystallographic terms and concepts, including crystal structure, unit cell, structure symbols, lattice, space-group notation, and atom position. It schematically illustrates the atom positions, prototypes, structure symbols, space-group notations...
Book Chapter

Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003736
EISBN: 978-1-62708-177-1
... to the martensite phase ( Ref 2 , 30 ). Often a superlattice structure is present that is then conveyed to the martensite product. Ordered or disordered, the martensite phase produced is usually of the 3R, 9R, or 2H type ( Ref 23 ). Shear along the (011) bcc planes in different directions and sequences creates...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006286
EISBN: 978-1-62708-169-6
... hot plate, and viewed with polarized light plus sensitive tint to reveal the grain structure. Courtesy of G.F. Vander Voort, George Vander Voort Consulting, Wadsworth, IL If α-stabilizing additions of aluminum exceed approximately 6%, the probability of a superlattice structure, which has been...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003770
EISBN: 978-1-62708-177-1
... in the matrix. The addition also enhances the magnitude of the age-hardening response and retards the tendency to overage or soften at extended aging times and higher aging temperatures. In C17500 and C17200 ( Table 1 ), the beryllides are (Cu,Co)Be with an ordered body-centered cubic CsCl (B2) superlattice...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006657
EISBN: 978-1-62708-213-6
... the measured Auger spectrum. For example, the kinetic energy at which an Auger transition occurs, Auger peak shape, and/or the loss structure associated with Auger transitions can change. Precise measurements to determine energy shifts and peak shape changes are useful in identifying the chemical states...