Study of the Phase Formation of Sol-Gel YBa2Cu3O7-x Samples in Flowing Oxygen Atmosphere

The relationship of the resistivity versus synthesizing temperature of sol-gel YBa2Cu3O7-x samples, with Tc 91K, was studied while synthesizing in flowing oxygen atmosphere. A set of high temperature -T curves were obtained for the whole process. After four rounds of synthesizing, the resistivity of the sample was =1.00×10-3cm at room temperature. The -T curve of the last round also showed that the orthorhombic to tetragonal phase transformation of the sample occurred around 600oC that is lower than the YBa2Cu3O7-x sample prepared in ambient atmosphere. Other measurements such as X-ray diffraction, SEM measurement, low temperature R-T and M-T measurement were also taken to get more information of these samples.

Download Full-text

Structural and Enhanced Optical Properties of Stabilized γ‒Bi2O3 Nanoparticles: Effect of Oxygen Ion Vacancies

Nanomaterials ◽

10.3390/nano10061023 ◽

2020 ◽

Vol 10 (6) ◽

pp. 1023 ◽

Cited By ~ 2

Author(s):

Ashish Chhaganlal Gandhi ◽

Chia-Liang Cheng ◽

Sheng Yun Wu

Keyword(s):

Room Temperature ◽

Excess Oxygen ◽

Ambient Atmosphere ◽

Photoluminescence Spectra ◽

X Ray Diffraction ◽

X Ray ◽

Band Emission ◽

Oxygen Ion ◽

Integrated Intensity ◽

Effect Of Oxygen

We report the synthesis of room temperature (RT) stabilized γ–Bi2O3 nanoparticles (NPs) at the expense of metallic Bi NPs through annealing in an ambient atmosphere. RT stability of the metastable γ–Bi2O3 NPs is confirmed using synchrotron radiation powder X-ray diffraction and Raman spectroscopy. γ–Bi2O3 NPs exhibited a strong red-band emission peaking at ~701 nm, covering 81% integrated intensity of photoluminescence spectra. Our findings suggest that the RT stabilization and enhanced red-band emission of γ‒Bi2O3 is mediated by excess oxygen ion vacancies generated at the octahedral O(2) sites during the annealing process.

Download Full-text

Impedance Spectroscopy Study of LiTaO3 Powder Synthesized via Sol-Gel Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.545.275 ◽

2012 ◽

Vol 545 ◽

pp. 275-278 ◽

Cited By ~ 1

Author(s):

Lili Widarti Zainuddin ◽

Norlida Kamarulzaman

Keyword(s):

Room Temperature ◽

Single Phase ◽

Sol Gel ◽

Rhombohedral Structure ◽

Spectroscopy Study ◽

X Ray Diffraction ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Impedance Spectroscopy Study

A ceramics sample of LiTaO3 was prepared using a sol-gel method. The sample is annealed at 750 °C for 48 hours. X-ray diffraction analysis indicate the formation of single phase, rhombohedral structure. An ac impedance study was used to analyse the conductivity of LiTaO3 at room temperature and at various temperatures.

Download Full-text

Synthesis and characterization of MnO2nanowires

Modern Physics Letters B ◽

10.1142/s0217984917500063 ◽

2017 ◽

Vol 31 (02) ◽

pp. 1750006 ◽

Cited By ~ 1

Author(s):

Mohammad Hossein Ghorbani ◽

Abdol Mahmood Davarpanah

Keyword(s):

Lithium Batteries ◽

Manganese Oxides ◽

Room Temperature ◽

Annealing Temperature ◽

Sol Gel ◽

Average Crystallite Size ◽

X Ray Diffraction ◽

X Ray ◽

Xrd Method

Manganese oxides are of more interest to researchers because of their ability as catalysts and lithium batteries. In this research, MnO2nanowires with diameter about 45 nm were synthesized by sol–gel method at room temperature (RT). Effect of increasing the annealing temperature from 400[Formula: see text]C to 600[Formula: see text]C on crystalline structure of nanostructure were studied and average crystallite size was estimated about 22 nm. X-ray Diffraction (XRD) method, Energy-Dispersive X-ray Diffraction (EDXD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM) were used to characterize the nanowires of MnO2.

Download Full-text

X-ray diffraction studies of vivianite, metavivianite, and barićite

Mineralogical Magazine ◽

10.1180/minmag.1985.049.350.11 ◽

1985 ◽

Vol 49 (350) ◽

pp. 81-85 ◽

Cited By ~ 11

Author(s):

T. Sameshima ◽

G. S. Henderson ◽

P. M. Black ◽

K. A. Rodgers

Keyword(s):

Monoclinic Phase ◽

Amorphous State ◽

Twin Plane ◽

Coarse Grained ◽

X Ray Diffraction ◽

X Ray ◽

Triclinic Phase ◽

Type Lattice ◽

Relationship Of ◽

The Relationship

AbstractVivianite specimens from various world localities yield X-ray powder patterns of two types: one corresponds with that shown by synthetic Fe3(PO4)2· 8H2O and is not readily distinguished from that of barićite; the second shows reflections of monoclinic vivianite and triclinic metavivianite along with reflections of a bobierrite-type phase. The triclinic phase occurs as two twin-related lattices with twin plane 110 being the structural equivalent of 010 in the monoclinic phase. The relationship of the bobierrite-type lattice to the other two has not been established. The ternary pattern is produced by some coarse-grained vivianites on natural oxidation. Finer grained vivianites oxidise to an X-ray amorphous state without passing through a triclinic intermediate.

Download Full-text

The Influence of Mn Doping on the Dielectric Properties of Ba0.5Sr0.5TiO3 Ceramics

Materials Science Forum ◽

10.4028/www.scientific.net/msf.859.18 ◽

2016 ◽

Vol 859 ◽

pp. 18-23 ◽

Cited By ~ 1

Author(s):

Li Ping Zhao ◽

Wen Hong Tao ◽

Xing Hua Fu ◽

Wen Zhe Cao ◽

Guo Yuan Cheng ◽

...

Keyword(s):

Dielectric Properties ◽

Material Properties ◽

Room Temperature ◽

Sol Gel ◽

Barium Nitrate ◽

Strontium Nitrate ◽

X Ray Diffraction ◽

Mn Doping ◽

X Ray ◽

Scanning Electron

(Ba0.5Sr0.5)1-xMnxTiO3(x=0,0.01,0.03,0.05)ceramics were prepared via a new sol-gel method with titannium oxide, strontium nitrate, barium nitrate and manganous nitrate as raw materials.The effect of Mn doping on the microstructure and dielectric properties of the BST were characterized by field scanning electron microscopy,x-ray diffraction and impedance analyser.It was found that the dopted ions could not alter the basic crystal strcuture and they only improved the material properties as modified ions when x≤0.3.The (Ba0.5Sr0.5)1-xMnxTiO3 ceramics sintered at 1250°C for 2h exhibited good dielectric properties(er=1330,tand=0.03)at room temperature and f=1KHz when x=0.03 and the grains were regular and uniform ,indicating a dense microstrcture.

Download Full-text

Photo-acoustic properties of nanoTiO2:Er

International Journal of Basic and Applied Sciences ◽

10.14419/ijbas.v5i4.5739 ◽

2016 ◽

Vol 5 (4) ◽

pp. 196

Author(s):

R. Palomino-Merino ◽

R. Lozada-Morales ◽

J. Martínez-Juárez ◽

G. Juárez-Díaz ◽

J. Carmona-Rodriguez ◽

...

Keyword(s):

Room Temperature ◽

Sol Gel ◽

Acoustic Properties ◽

X Ray Diffraction ◽

X Ray ◽

Transmission Electron ◽

Average Grain Size ◽

Electron Dispersion ◽

Er Doped ◽

Spectroscopy Optical

Nanocrystalline Er-doped TiO2 was prepared by sol-gel at room temperature. X-ray diffraction, photoacoustic spectroscopy (optical absorption), transmission electron microscopy (TEM), and electron dispersion microscopy (EDS) were carried out on both as-prepared and thermally-annealed (air at 700 ºC) samples, revealing the anatase crystalline phase of TiO2. The samples exhibit an average grain size from 38 to 5.1 nm, as the nominal concentration of Er varies from 0 % to 7 %. The photoacoustic spectra evidence the absorption edge at 300 nm attributed to TiO2, as well as several electronic transitions which are atomic energy absorption-line levels characteristics of Er.

Download Full-text

Chemistry of the phenoxathiins and isosterically related heterocycles. XXXI. Synthesis of the 1,3-diazaphenoxathiin ring system and the relationship of the13C-NMR chemical shift of the C-10a resonances to the molecular dihedral angle determined by X-Ray diffraction: A further investigation

Journal of Heterocyclic Chemistry ◽

10.1002/jhet.5570210413 ◽

1984 ◽

Vol 21 (4) ◽

pp. 995-1000 ◽

Cited By ~ 5

Author(s):

Salvador Puig-Torres ◽

Gary E. Martin ◽

Steven B. Larson ◽

Stanley H. Simonsen

Keyword(s):

Chemical Shift ◽

Dihedral Angle ◽

Ring System ◽

X Ray Diffraction ◽

Nmr Chemical Shift ◽

X Ray ◽

Relationship Of ◽

The Relationship

Download Full-text

Microwave Processing of Sol-Gel Derived Potassium Niobate

MRS Proceedings ◽

10.1557/proc-180-401 ◽

1990 ◽

Vol 180 ◽

Cited By ~ 3

Author(s):

Z. Fathi ◽

I. Ahmad ◽

D.E. Clark

Keyword(s):

Sol Gel ◽

Microwave Energy ◽

Phase Changes ◽

Conventional Heating ◽

Potassium Niobate ◽

Structure And Properties ◽

X Ray Diffraction ◽

X Ray ◽

Novel Processing ◽

The Relationship

ABSTRACTMicrowave energy has been used in a novel processing method. The relationship between processing, structure and properties of sol-gel-derived potassium niobate sol as well as thin films has been investigated. A comparison has been established between microwave and conventional heating for drying, calcining and crystallizing sol-gel-derived samples. Structural and phase changes were monitored by thermogravimetric analysis (TGA), differential thermal analysis (DTA) and x-ray diffraction (XRD).

Download Full-text

Structural, Magnetic, and Electrical Properties of BiFe1-xMnxO3 Thin Films

MRS Proceedings ◽

10.1557/proc-1199-f03-26 ◽

2009 ◽

Vol 1199 ◽

Author(s):

Danilo G Barrionuevo ◽

Surinder P Singh ◽

Maharaj S. Tomar

Keyword(s):

Thin Films ◽

Room Temperature ◽

Magnetic Measurements ◽

Sol Gel ◽

Ion Concentration ◽

Ferromagnetic Phase ◽

X Ray Diffraction ◽

X Ray ◽

Si Substrates ◽

Sol Gel Process

AbstractWe synthesized BiFe1-xMnxO3 (BFMO) for various compositions by sol gel process and thin films were deposited by spin coating on platinum Pt/Ti/SiO2/Si substrates. X-ray diffraction shows all the diffraction planes corresponding to rhombohedrally distorted perovskite BiFeO3 structure. The absence of any impurity phase in the films suggests the incorporation Mn ion preferentially to Fe site in the structure for low concentration. Magnetic measurements reveal the formation of ferromagnetic phase at room temperature with increased Mn substitution. On the other hand, ferroelectric polarization decreases with increasing Mn ion concentration. Raman studies suggest the dopant induced structural distortion.

Download Full-text

Preparation of PST Ferroelectric Thin Films by Sol-Gel Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.734-737.2328 ◽

2013 ◽

Vol 734-737 ◽

pp. 2328-2331

Author(s):

Yu Fei You ◽

C.H. Xu ◽

Jing Zhe Wang ◽

Jun Peng Wang

Keyword(s):

Thin Films ◽

Cross Section ◽

Spin Coating ◽

Room Temperature ◽

Sol Gel ◽

Ferroelectric Thin Films ◽

X Ray Diffraction ◽

X Ray ◽

Sol Gel Process ◽

Electronic Microscope

Sol-gel method is used for the formation of Pb0.499Sr0.499TiO3 (PST)thin films. The initial films were prepared with spin coating sol solution on silicon wafer and drying at room temperature and then heating coated dry sol film at 400°C for 10min. This process was repeated for 1-4 times to obtain 4 initial films with different thicknesses. The 4 initial films were annealed at 700°C for 2h to obtain PST ceramics films. The morphologies of the surface and cross-section of PST films were observed with a scanning electronic microscope (SEM). The phase structures of PST films were analyzed using X-ray diffraction meter (XRD). Experimental results show that PST film prepared by coating sol on silicon with different thicknesses can be high smooth,uniform and compact film.

Download Full-text