Structure and Coherence of Metallic Superlattices

1984 ◽  
Vol 37 ◽  
Author(s):  
D. B. McWhan ◽  
Murray Hill
Keyword(s):  
Single Crystal ◽  
Mutual Solubility ◽  
Lattice Parameters ◽  
Diamond Structure ◽  
Perfect Single Crystal ◽  
Zinc Blende ◽  
Zinc Blende Structure

Most of the papers in this symposium have dealt with superlattices formed from semiconductors with the diamond or zinc blende structure or derivative structures such as fluorite in which one sublattice has the diamond structure. Such superlattices are often called compositionally modulated alloys (CMA) because the two components have the same or related structures and because the two components have some mutual solubility. In these cases, depending on the differences in the lattice parameters, the resulting CMA will be almost a perfect single crystal, and the sharpness of the interfaces between the two alternating components will depend on the amount of interdiffusion during growth.

Evidence of Forbidden Reflections in the Diffuse Scattering of Hg0.80Cd0.20Te Single Crystals

1990 ◽  
Vol 209 ◽  
Author(s):  
J. P. Quintana
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Diffuse Scattering ◽  
Anomalous Dispersion ◽  
Scattering Pattern ◽  
X Ray ◽  
Zinc Blende ◽  
Zinc Blende Structure

ABSTRACTThe x-ray diffuse scattering pattern from a commercial bulk n-type Hg0.80Cd0.20Te single crystal was measured in absolute units. Anomalous dispersion techniques near the Hg LIII edge were used to determine theintensity due to Hg interactions. Diffuse x-ray superlattice reflections are reported that are forbidden by the zinc-blende structure. The systematic absences in these peaks eliminate the possibility that they are the result of a Cu3Au ordering scheme.

Organometallic Vapor Phase Epitaxial Growth of ZnGeAs2 and (ZnGeAs2)xGe1−x on GaAs

1988 ◽  
Vol 144 ◽  
Author(s):  
G. S. Solomon ◽  
J. B. Posthill ◽  
M. L. Timmons
Keyword(s):  
Single Crystal ◽  
Band Gap ◽  
Lattice Constant ◽  
Vapor Phase ◽  
Gaas Substrate ◽  
Lattice Mismatch ◽  
Chalcopyrite Structure ◽  
Zinc Blende ◽  
Indirect Band Gap ◽  
Zinc Blende Structure

ABSTRACTEpitaxial single crystal (001) chalcopyrite-structure ZnGeAs2 and single crystal (100) zinc blende-structure (ZnGeAs2)xGe1−x alloys have been grown by organometallic vapor phase epitaxy on (100) GaAs. Selected area electron diffraction was used to determine the crystal structure for several Zn:Ge molar flow ratios. Bulk chemical composition was determined by electron microprobe and correlated to crystal lattice constants obtained from x-ray diffraction. Due to the lattice mismatch between chalcopyrite-structure ZnGeAs2 and the GaAs substrate, the epitaxy is elastically strained, compressing the a-lattice constant and elongating the c-lattice constant. Optical absorption and transmission spectroscopy indicate the zinc-blende-structure material has an indirect band gap of approximately 0.6 eV, whereas the chalcopyrite ZnGeAs2 has a direct band gap of 1.15 eV. Secondary ion mass spectroscopy reveals significant Zn diffusion into the GaAs substrate if the Zn:Ge molar flow ratio exceeds the ratio required for stoichiometric chalcopyrite-structure crystal growth.

Single crystal X-ray study of the modulated structure in Ga2XTe3with the defect zinc-blende structure

2009 ◽  
Vol 6 (5) ◽  
pp. 1162-1165 ◽  
Author(s):  
S. Kashida ◽  
Y. Otaki ◽  
Y. Yanadori ◽  
Y. Seki ◽  
M. Tadano
Keyword(s):  
Single Crystal ◽  
Modulated Structure ◽  
X Ray ◽  
Zinc Blende ◽  
Zinc Blende Structure

Single-crystal investigation of Ce5AgxGe4−x (x = 0.1−1.08) with Sm5Ge4 type

2020 ◽  
Vol 75 (8) ◽  
pp. 765-768
Author(s):  
Bohdana Belan ◽  
Dorota Kowalska ◽  
Mariya Dzevenko ◽  
Mykola Manyako ◽  
Roman Gladyshevskii
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Diffraction Data ◽  
Binary Compound ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray

AbstractThe crystal structure of the phase Ce5AgxGe4−x (x = 0.1−1.08) has been determined using single-crystal X-ray diffraction data for Ce5Ag0.1Ge3.9. This phase is isotypic with Sm5Ge4: space group Pnma (No. 62), Pearson code oP36, Z = 4, a = 7.9632(2), b = 15.2693(5), c = 8.0803(2) Å; R1 = 0.0261, wR2 = 0.0460, 1428 F2 values and 48 variables. The two crystallographic positions 8d and 4c show Ge/Ag mixing, leading to a slight increase in the lattice parameters as compared to those of the pure binary compound Ce5Ge4.

Sputter Deposition of Fe-Co Nitride for Ferromagnetic Granular Nitride Thin Film

2009 ◽  
Vol 631-632 ◽  
pp. 327-331 ◽  
Author(s):  
K. Sakon ◽  
Y. Hirokawa ◽  
Yasuji Masubuchi ◽  
Shinichi Kikkawa
Keyword(s):  
Thin Film ◽  
Solid Solution ◽  
Thermal Decomposition ◽  
Sputter Deposition ◽  
Composite Target ◽  
Zinc Blende ◽  
Alloy Particles ◽  
Sputter Deposited ◽  
Magneto Resistance ◽  
Zinc Blende Structure

Sputter deposited Fe0.7Co0.3 nitride thin film had zinc blende structure. It was thermally decomposed completely back to the ferromagnetic Fe0.7Co0.3 alloy above 400°C. As-deposited nitride thin films obtained in cosputtering of (Fe0.7Co0.3)1-xAlx composite target with nitrogen sputter gas were solid solutions with zinc blende (x≤0.44) and wurtzite (x>0.5) type structure, respectively. The largest magneto resistance ratio of 0.24% was observed on the Fe0.7Co0.3 alloy particles dispersed in AlN thin film obtained by thermal decomposition of the nitride solid solution with x=0.66 at 500°C.

scholarly journals β-Y(BO2)3 – a new member of the β-Ln(BO2)3 (Ln=Nd, Sm, Gd–Lu) structure family

2017 ◽  
Vol 72 (12) ◽  
pp. 983-988 ◽  
Author(s):  
Martin K. Schmitt ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray

Abstractβ-Y(BO2)3 was synthesized in a Walker-type multianvil module at 5.9 GPa/1000°C. The crystal structure has been elucidated through single-crystal X-ray diffraction. β-Y(BO2)3 crystallizes in the orthorhombic space group Pnma (no. 62) with the lattice parameters a=15.886(2), b=7.3860(6), and c=12.2119(9) Å. Its crystal structure will be discussed in the context of the isotypic lanthanide borates β-Ln(BO2)3 (Ln=Nd, Sm, Gd–Lu).

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