Lattice Modulation in the Long Period Ordered Alloys Studied by X-Ray Diffraction. III. Cu3Pd(α'')

1970 ◽  
Vol 28 (4) ◽  
pp. 1005-1014 ◽  
Author(s):  
Kiyohito Okamura
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Long Period ◽  
Ordered Alloys

Lattice Modulation in the Ordered Alloys with Long Period Studied by X-Ray Diffraction. I. Au3Cd

1965 ◽  
Vol 20 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Hiroshi Iwasaki ◽  
Makoto Hirabayashi ◽  
Shiro Ogawa
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Long Period ◽  
Ordered Alloys

Lattice Modulation in the Long Period Ordered Alloys Studied by X-Ray Diffraction. II. CuAuII

1968 ◽  
Vol 24 (3) ◽  
pp. 569-579 ◽  
Author(s):  
Kiyohito Okamura ◽  
Hiroshi Iwasaki ◽  
Shiro Ogawa
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Long Period ◽  
Ordered Alloys

Lattice Modulation in the Long Period Ordered Alloys Studied by X-Ray Diffraction. IV. Pd3Mn

1971 ◽  
Vol 31 (2) ◽  
pp. 497-505 ◽  
Author(s):  
Hiroshi Iwasaki ◽  
Kiyohito Okamura ◽  
Shiro Ogawa
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Long Period ◽  
Ordered Alloys

Grazing-angle Incidence X-ray Diffraction by the Si1-α(x)-β(x)Geβ(x)Cβ(x)/Si Heterojunction where the Germanium and the Carbon Concentrations are Periodically Varying along the Flat Layer Surface

2002 ◽  
Vol 716 ◽  
Author(s):  
Hayk H. Bezirganyan ◽  
Siranush E. Bezirganyan ◽  
Hakob P. Bezirganyan ◽  
Petros H. Bezirganyan
Keyword(s):  
Strain Field ◽  
Grazing Angle ◽  
Layer Surface ◽  
X Ray Diffraction ◽  
X Ray ◽  
Intermediate Transformation ◽  
Long Period ◽  
Theoretical Paper ◽  
Carbon Concentrations ◽  
Coherent Part

AbstractPresented theoretical paper concerns the investigation of SiGeC/Si heterojunction by the Grazing-angle Incidence X-ray Diffraction (GIXD) method. We consider a possibility in principal of the GIXD by the specific long-range harmonic variations of the germanium and carbon compositions in the thin SiGeC layer. Evaluation of the theoretically calculated coherent part of x-radiation scattered by the SiGeC layer points the way to the experimental direct investigations of the long-period structured intermediate transformation states of SiGeC layer that emerge owing to inhomogeneity of the strain field along the heterojunction surface.

scholarly journals Effect of LiNO3 on Expansion of Alkali–Silica Reaction in Rock Prisms and Concrete Microbars Prepared by Sandstone

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1150 ◽  
Author(s):  
Jinxin Liu ◽  
Lanqing Yu ◽  
Min Deng
Keyword(s):  
Electron Microscope ◽  
Critical Concentration ◽  
Stress Test ◽  
Molar Ratio ◽  
Alkali Silica Reaction ◽  
X Ray Diffraction ◽  
High Concentration ◽  
X Ray ◽  
Long Period ◽  
Scanning Electron

The aim of this research is to investigate the effect of LiNO3 on the alkali–silica reaction (ASR) expansion of reactive sandstone and the mechanism through which this occurs. This paper presents the results from tests carried out on rock prisms and concrete microbars prepared by sandstone and LiNO3. The findings show that LiNO3 does not decrease the expansion of these samples unless the molar ratio of [Li]/[Na + K] exceeds 1.66, and the expansion is greatly increased when its concentration is below this critical concentration. The expansion stress test proves that Li2SiO3 is obviously expansive. X-ray diffraction (XRD) and scanning electron microscope (SEM) results indicate that LiNO3 reacts with the microcrystalline quartz inside sandstone, inhibiting the formation of ASR gel, and the formation of Li2SiO3 causes larger expansion. A high concentration of LiNO3 might inhibit the ASR reaction in the early stages, and the formation of Li2SiO3 causes expansion and cracks in concrete after a long period of time.

Structure of Cerebrosides. II. Small Angle X-Ray Diffraction Study of Cerasine

1979 ◽  
Vol 34 (12) ◽  
pp. 1121-1124 ◽  
Author(s):  
R. Hosemann ◽  
J. Loboda-Čačković ◽  
H. Čačković ◽  
S. Fernandez-Bermúdez ◽  
F. J. Baltá-Calleja
Keyword(s):  
Molecular Weight ◽  
Fatty Acid ◽  
Hydrogen Atom ◽  
Low Temperature ◽  
Hydroxyl Group ◽  
X Ray Diffraction ◽  
Orientational Disorder ◽  
X Ray ◽  
Long Period ◽  
Lattice Planes

Cerasine having a molecular weight of 800 differs chemically from phrenosine only in the hydroxyl group attached to the fatty acid tail which is replaced by a hydrogen atom. Nevertheless, remarkable differences between both cerebrosides are detected in the lamellae periodicities. In the range of 23 - 66 °C just one single (instead of two) structure with a similar subcell to the triclinic one component of phrenosine is detected. Between 66 and 87 °C three new components (instead of one in phrenosine) appear. Two of the structures are similar to the two phrenosine-components at low temperature and the tilt angles of their chains with respect to the basal planes can explain the stabilizing capacity of the 201 and 301 netplanes of the paraffin-like subcells respectively. These lattice planes are parallely aligned to the surfaces of the lamellae. The long period of 58 Å of component II cannot be explained in such a wav. This period persits upto 105 °C and coexists from 87 °C with a new component showing a 40 Å-periodicity, which cannot either be explained in the above manner. Paracrystalline distortions of the arrangement of the bilayers can be justified by orientational disorder of the galactose heads.

Utilizing a unified structure model in (3 + 1)-dimensional superspace to identify a homologous phase (Ga1−αAlα)2O3(ZnO) m in ZnO-based thermoelectric composites

2020 ◽  
Vol 53 (6) ◽  
pp. 1542-1549
Author(s):  
Yuichi Michiue ◽  
Hyoung-Won Son ◽  
Takao Mori
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Composite Materials ◽  
The Other ◽  
Structure Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Long Period ◽  
Profile Fitting ◽  
Doped Zno

A unified structure model in (3 + 1)-dimensional superspace proved suitable for identification of a homologous phase (Ga1−αAlα)2O3(ZnO) m by the profile fitting of powder X-ray diffraction intensities for thermoelectric composite materials in the pseudoternary system ZnO–Al2O3–Ga2O3. A homologous compound of the phase parameter m ≃ 37 was found to coexist with (Al,Ga)-doped ZnO in samples sintered at 1723 K in air. The thermoelectric properties of the composite materials were closely related to the phase fractions. The higher the phase fraction of (Al,Ga)-doped ZnO with the wurtzite structure, the higher the electrical conductivity. On the other hand, the homologous compound with the long-period structure was effective in lowering the thermal conductivity of the materials.

Characterization of β′ Precipitate Phase in Aged Mg-12Gd-2Y-0.5Sm-0.5Sb-0.5Zr Alloy

2011 ◽  
Vol 194-196 ◽  
pp. 1357-1360
Author(s):  
Ke Jie Li ◽  
Quan an Li ◽  
Xiao Hui Zhang
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Aged Alloy ◽  
Ordered Structure ◽  
Precipitate Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Long Period ◽  
Transmission Electron

The Mg-12Gd-2Y-0.5Sm-0.5Sb-0.5Zr alloy was prepared under flux protection. The morphology and crystal structure of β′ precipitate phases in aged alloy has been studied using transmission electron microscopy and X-ray diffraction. The orientation relationship between β′ precipitate and matrix could existed as [ 010]BαB// [ 00]Bβ′B, (01 0) BαB// (020)Bβ′B and (0001)BαB was coherent with (001)Bβ′B; [0001]BαB// [001]Bβ′B, (1 00)BαB// (240)Bβ′B and ( 010)BαB was coherent with (0A_,8EEA0)Bβ′B. The HREM images indicated that the β' precipitates have a long-period ordered structure at the same time.

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