Growth and Characterization of Epitaxial Thin Heterostructures of Ferromagnetic/Antiferromagnetic SrRuO3/Sr2YRuO6

1999 ◽  
Vol 602 ◽  
Author(s):  
R.A. Price ◽  
M.K. Lee ◽  
C.B. Eom ◽  
X.W. Wu ◽  
M.S. Rzchowski
Keyword(s):  
Crystal Structure ◽  
Exchange Bias ◽  
Lattice Parameter ◽  
Interface Roughness ◽  
Epitaxial Thin Films ◽  
X Ray Diffraction ◽  
Magnetic Exchange ◽  
Unique Material ◽  
Perovskite Crystal

AbstractWe have grown epitaxial thin films of antiferromagnetic ruthenate Sr2YRuO6 on miscut (001) SrTiO3 by 90° off-axis sputtering. Sr2YRuO6 is a unique material that allows us to grow epitaxial ferromagnetic/antiferromagnetic heterostructures. Antiferromagnetic Sr2YRuO6 has the same pseudo-cubic perovskite crystal structure as the ferromagnetic conductive oxide SrRuO3. The Sr2YRuO6 perovskite crystal structure has Y and pentavalent Ru located on the octahedral sites and the pseudo-cubic lattice parameter of 4.08Å. The Neel temperature of bulk Sr2YRuO6 is known to be 26K. Four-circle X-ray diffraction analysis revealed the Sr2YRuO6 films are purely (110) normal to the substrate with two 90° domains in the plane. We have also grown epitaxial heterostructures of SrRuO3/Sr2YRuO6. These bilayers permit detailed studies of the magnetic exchange bias phenomena at these interfaces, including the role of uncompensated spins thought to arise from interface roughness. Magnetization measurements on the SrRuO3/Sr2YRuO6 heterostructures show a shifting of the hysteresis loop, indicating exchange bias. Such exchange-biased interfaces are important for electrode pinning in magnetic tunnel junctions.

Effects of dietary alteration of bicarbonate and magnesium on rat bone

1986 ◽  
Vol 250 (2) ◽  
pp. F302-F307 ◽  
Author(s):  
J. M. Burnell ◽  
C. Liu ◽  
A. G. Miller ◽  
E. Teubner
Keyword(s):  
Crystal Structure ◽  
Bone Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Growing Rats ◽  
Final Composition ◽  
Rat Bone

To study the effects of bicarbonate and magnesium on bone, mild acidosis and/or hypermagnesemia were produced in growing rats by feeding ammonium chloride and/or magnesium sulfate. Bone composition, quantitative histomorphometry, and mineral x-ray diffraction (XRD) characteristics were measured after 6 wk of treatment. The results demonstrated that both acidosis (decreased HCO3) and hypermagnesemia inhibited periosteal bone formation, and, when combined, results were summative; and the previously observed in vitro role of HCO3- and Mg2+ as inhibitors of crystal growth were confirmed in vivo. XRD measurements demonstrated that decreased plasma HCO3 resulted in larger crystals and increased Mg resulted in smaller crystals. However, the combined XRD effects of acidosis and hypermagnesemia resembled acidosis alone. It is postulated that the final composition and crystal structure of bone are strongly influenced by HCO3- and Mg2+, and the effects are mediated by the combined influence on both osteoblastic bone formation and the growth of hydroxyapatite.

scholarly journals VISUALISASI STRUKTUR KRISTAL KERAMIK PEROVSKITE MENGGUNAKAN VESTA

2018 ◽  
Vol 15 (1) ◽  
pp. 46
Author(s):  
Sundami Restiana ◽  
Ari Sulistyo Rini
Keyword(s):  
Crystal Structure ◽  
Diffraction Pattern ◽  
Critical Concentration ◽  
Ceramic Materials ◽  
Lattice Parameter ◽  
Peak Position ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Information ◽  
Software Program

Visualization of crystal structures and simulation of X-ray diffraction patterns of perovskite ceramic was successfully performed by VESTA software programs. The purpose of this research is to obtain the relation of lattice parameter, and composition to the diffraction pattern. The software program produces crystal structure information and a representative X-ray diffraction pattern for the ceramic materials. The program needs several input parameters such as the coordinates of each constituent atom, lattice parameters, and space symmetry. The obtained output of the software program are in the form of diffraction pattern graph and crystal structure data which gives the description of the profile and type (phase) of ceramic material. The results showed that the peak position and intensity of the diffraction pattern are influenced by the arrangement of  the atoms within the unit cell. The addition of impurity atoms such as Sr on the Ba side in BaTiO3 causes the BaTiO3 structure changes from Orthorombic (a≠b≠c) to Tetragonal (a=b≠c) structure. Based on the simulation, it can be predicted that the critical concentration of the change of structure occur at Sr concentration about 0.4.

A novel representative in the rare family of trivanadates, KMn2V3O10: synthesis, crystal structure and magnetic properties

2018 ◽  
Vol 74 (1) ◽  
pp. 97-103 ◽  
Author(s):  
Olga Yakubovich ◽  
Larisa Shvanskaya ◽  
Zlata Pchelkina ◽  
Olga Dimitrova ◽  
Anatoliy Volkov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Three Dimensional ◽  
Exchange Interactions ◽  
Potassium Ions ◽  
The Novel ◽  
First Principles Calculations ◽  
X Ray Diffraction ◽  
Magnetic Exchange ◽  
Cell Parameters ◽  
Magnetic Couplings

Potassium dimanganese trivanadate, KMn2V3O10, was synthesized hydrothermally and its crystal structure was determined from single-crystal X-ray diffraction data. The novel phase crystallizes with triclinic symmetry in space group P\bar 1 with unit-cell parameters of a = 6.912 (5), b = 6.993 (5), c = 9.656 (5) Å, α = 101.858 (5), β = 102.627 (5), γ = 100.669 (5)°, Z = 2 and V = 432.6 (5) Å3. Its structure is built from tetramers of MnO6 octahedra sharing edges and trimers of VO4 tetrahedra sharing vertices. These main structural fragments are linked in a three-dimensional framework with channels occupied by potassium ions. The transformation of this structure to that of interconnected NaCa3Mn(V3O10)(V2O7) is discussed. The title compound orders antiferromagnetically at T N = 8.2 K due to the magnetic exchange interactions between tetramers of Mn octahedra through VO4 tetrahedra. First-principles calculations show the magnetic couplings via Mn—O—Mn and Mn—O—V—O—Mn pathways.

The Role of Au Doping on the Structural and Optical Properties of Cu2O Films

2019 ◽  
Vol 58 ◽  
pp. 49-67 ◽  
Author(s):  
Emine Güneri
Keyword(s):  
Optical Properties ◽  
Crystal Size ◽  
Structural Parameters ◽  
Lattice Parameter ◽  
Skin Depth ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Polycrystalline Form ◽  
Doping Ratio

The changes in structural and optical properties of the Cu2O films obtained on the glass with different concentrations of Au by the chemical bath method were studied in this work. Lattice parameter, crystal size, preferential orientation and surface tension of the films were calculated using X-ray diffraction data which showed that all of the films were in polycrystalline form. It was determined that the structural parameters of all films were changed with the doping ratio. The surface morphology of the films was imaged using a field emission scanning electron microscope. The optical properties of the films were discovered using the optic spectrometer. Changes in the optical properties were discovered as a function of Au ratio. It was determined that the energy band gap value (2.12 eV-2.02 eV), the refractive index, the extinction coefficient, the real and dielectric coefficients, the optical conductivity, and the skin depth of films varied with Au doping ratio.

Studied on Structural Characterization of Lanthanum Doped Barium Titanium Ceramics

2015 ◽  
Vol 819 ◽  
pp. 198-203
Author(s):  
Nur Farahin Abdul Hamid ◽  
Rozana Aina Maulat Osman ◽  
Mohd Sobri Idris ◽  
Tze Qing Tan
Keyword(s):  
Crystal Structure ◽  
Lattice Parameter ◽  
Phase Changes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tetragonal Crystal ◽  
Tetragonal Crystal Structure ◽  
La Doped ◽  
Conventional Solid State Synthesis

La-doped barium titanate (BaTiO3) was prepared using conventional solid state synthesis route. All peaks for sample x=0 are approaching the phase pure of BaTiO3 structure with tetragonal crystal structure (P4mm). Sintering of pressed powder are performed at 1300oC, 1400oC and 1450oC for overnight for pure BaTiO3 and 1350oC for 3 days for BaTiO3 doped lanthanum with intermittent grinding. Phase transition was studied by different x composition. The changes in the crystal structure of the composition x=0.1 and 0.2 were detected by using X-ray diffraction (XRD). The phase changes between tetragonal-cubic and cubic-tetragonal depending on the temperature. Rietveld Refinement analysis is carried out to determine the lattice parameter and unit cell for BaTiO3.

Crystal structure and chemistry of natural kutinaite from Černý Důl, Krkonoše, Czech Republic

2015 ◽  
Vol 79 (5) ◽  
pp. 1099-1109 ◽  
Author(s):  
Luca Bindi ◽  
Emil Makovicky
Keyword(s):  
Crystal Structure ◽  
Czech Republic ◽  
Metal Contacts ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Cell Parameters ◽  
Metal Metal ◽  
Crystal Structure And Chemistry

AbstractWe have characterized the crystal structure of natural kutinaite, a rare mineral from the ores of Černý Důl, Czech Republic, by single-crystal X-ray diffraction and chemical analysis. We found that the structure of natural kutinaite is not identical to that of synthetic Cu14Ag6As7, previously reported to be cubic, space group Pm3m. Although topologically similar, the structure of natural kutinaite is indeed tetragonal, space group P4/mmm, with cell parameters: a = 11.789(2), c = 11.766(2) Å, V = 1635.5(4) Å3 and Z = 4. Electron microprobe analyses pointed to the (K,Tl)0.25Cu14Ag6As6.75 stoichiometry (Z = 4), or (K, Tl)Cu56Ag24As27 with Z = 16. The crystal structure of an untwinned crystal has been refined to R1 = 2.61%. It consists of clusters of eight edge-sharing tetrahedra of Cu, which alternate in a 3D chess-board manner with octahedral clusters of six Ag atoms. The latter are surrounded by triangularly coordinated copper in eight faces of a cuboctahedron. The last structure components are large cavities containing partly occupied (K,Tl) sites, coordinated by 18 Ag and As ligands. The structure is full of direct metal-metal contacts although As plays the role of anion, associating especially with copper.

scholarly journals Structural and thermal properties of Zn-containing magnesium aluminate spinels obtained by wet chemical method

2019 ◽  
Vol 37 (2) ◽  
pp. 238-243
Author(s):  
Omer Kaygili ◽  
Niyazi Bulut ◽  
Tankut Ates ◽  
Ismail Ercan ◽  
Suleyman Koytepe ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Properties ◽  
Chemical Method ◽  
Lattice Parameter ◽  
Magnesium Aluminate ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Ft Ir ◽  
Wet Chemical

AbstractIn the present study, the dopant effect of Zn on the crystal structure, thermal properties and morphology of magnesium aluminate (MgAl2O4) spinel (MAS) structure was investigated. A pure and two Zn-containing MASs (e.g. MgAl1.93Zn0.07O4 and MgAl1.86Zn0.14O4) were synthesized for this purpose via a wet chemical method, and the as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, differential thermal analysis (DTA), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy techniques. It was found that the crystal structure, thermal properties and morphology of the MAS system change with the increase in the amount of Zn. MgO phase formation was observed. The values of the lattice parameter, unit cell volume and crystallite size increased, and the crystallinity percentage decreased. The morphology was also affected by adding of Zn.

Ni2Sn2Zn from single-crystal X-ray diffraction

2012 ◽  
Vol 68 (10) ◽  
pp. i65-i67 ◽  
Author(s):  
Clemens Schmetterer ◽  
Divakar Rajamohan ◽  
Herta Silvia Effenberger ◽  
Hans Flandorfer
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Structural Features ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Quaternary Compound ◽  
Space Group ◽  
X Ray

Dinickel ditin zinc, Ni2Sn2Zn, crystallizes in the cubic space group Pm\overline{3}m, with a lattice parameter ofa= 8.845 (1) Å and with all atoms occupying special positions. The crystal structure exhibits pronounced similarities with that of the quaternary compound Ni5.20Sn8.7Zn4.16Cu1.04. It shares structural features with other compounds in the Ni–Sn–Zn system, such as Ni5Sn4Zn and Ni3Sn2.

Crystal Structure of Bis(trimethyltin)Selenate Dihydrateand Rotational Tunnelling of the Methyl Groups

1989 ◽  
Vol 44 (2) ◽  
pp. 151-159 ◽  
Author(s):  
Da Zhang ◽  
Michael Prager ◽  
Shi-Qi Dou ◽  
Alarich Weiss
Keyword(s):  
Crystal Structure ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Methyl Groups ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
Lattice Constants ◽  
Group D

Abstract Rotational tunnelling and librations of methyl groups in bis(trimethyltin) selenate dihydrate, [(CH3)3Sn]2SeO4 · 2 H2O, have been studied at low temperature using inelastic neutron scattering (INS) technique. Three tunnel transitions at 1.31 μeV, 3.47 μeV, and 21.0 μeV of equal intensity were recorded. In the energy range of phonons a broad, slightly structured intensity distribution is observed. An attempt is made to identify and assign librational modes. The crystal structure of the title compound was determined by single crystal X-ray diffraction. [(CH3)3Sn]2SeO4 · 2 H2O crystallizes orthorhombic, space group D142h-Pbcn with 4 molecules in the unit cell. The lattice constants at room temperature are a = 1142.9(3) pm, b = 1304.6(4) pm, and c = 1084.6(3) pm. According to the molecular symmetry, the two "(CH3)3Sn(H2O)" units in molecule are crystallographically equivalent, but the three methyl groups bound to one Sn-atom are inequivalent. This result coincides well with the observation of three tunnel transitions in INS. A comparison with the related compound, bis(trimethyltin) sulfate dihydrate, is presented. The existence of hydrogen bonding and the role of intermolecular interactions on rotational tunnelling are discussed.

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