Investigation of the Phase Composition of Lithium-Titanium Ferrites by Thermo-Magnetometric and X-Ray Analysis

2015 ◽  
Vol 1085 ◽  
pp. 233-236 ◽  
Author(s):  
Alexander L. Astafyev ◽  
Elena N. Lysenko ◽  
Anatoly P. Surzhikov
Keyword(s):  
Magnetic Field ◽  
Phase Composition ◽  
Magnetic Phase ◽  
Diffraction Method ◽  
Precise Estimate ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
X Ray ◽  
Gravimetric Measurements ◽  
Lithium Titanium

In the present work, the formation of the phase composition in the synthesis of lithium-titanium ferrite composition Li0.6Fe2.2Ti0.2O4 was investigated using thermo-magnetometry method based on thermo-gravimetric measurements in a magnetic field. Results of thermo-magnetometric analysis are compared with X-ray diffraction method data. It is shown that the thermo-magnetometry method better reflects the formation of the magnetic phase in the synthesis of ferrite, and therefore provides a more precise estimate the phase composition of the synthesis products.

Evaluation of Tri-Axial Magnetostriction in Cube-Oriented Fe-Ga Single Crystal by Using X-Ray Diffraction Method

2017 ◽  
Vol 909 ◽  
pp. 300-305 ◽  
Author(s):  
Takehito Ikeuchi ◽  
Akihiro Koyama ◽  
Muneyuki Imafuku ◽  
Shun Fujieda ◽  
Yusuke Onuki ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Volume Fraction ◽  
Diffraction Method ◽  
Diffraction Measurement ◽  
Magnetic Field Direction ◽  
Magnetic Domains ◽  
X Ray Diffraction ◽  
X Ray

We carried out in situ tri-axial magnetostriction analysis for cube-oriented Fe-18%Ga single crystal by X-ray diffraction measurement under magnetic field. Periodic change in tri-axial magnetostriction with applied magnetic field direction was clearly observed. However, those values in [100] and [010] directions were not equivalent. Theoretical calculation of magnetostriction considering domain structure revealed this is caused by the non-equivalent volume fraction of initial magnetic domains.

A standardless X-ray diffraction method for the quantitative analysis of multiphase mixtures

1987 ◽  
Vol 20 (6) ◽  
pp. 457-460 ◽  
Author(s):  
J. Rius ◽  
F. Plana ◽  
A. Palanques
Keyword(s):  
Phase Composition ◽  
Quantitative Analysis ◽  
Qualitative Analysis ◽  
Least Squares ◽  
Diffraction Method ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
Absorption Coefficients ◽  
X Ray ◽  
Pure Phases

An X-ray diffraction method is described that determines calibration constants using only diffracted intensities and calculated phase absorption coefficients through a least-squares procedure. The conditions necessary for the application of this method are that the qualitative analysis be complete, that sufficient samples with essential differences in the quantitative phase composition be available and that the chemical compositions of the phases be known approximately. It does not require the use of pure phases or the measuring of the sample absorption coefficients. It allows the easy introduction of known calibration constants, thus reducing the number of samples needed and increasing the versatility of the method.

scholarly journals THE MICROSTRUCTURE AND PHASE COMPOSITION OF MORTARS FROM THE 17TH CENTURY SACRED BUILDINGS

2021 ◽  
Vol 12 (4) ◽  
pp. 153-158
Author(s):  
ZDZISŁAWA OWSIAK ◽  
PAWEŁ SOBCZYŃSKI
Keyword(s):  
Thermal Analysis ◽  
Phase Composition ◽  
Diffraction Method ◽  
17Th Century ◽  
Historic Buildings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lime Mortars ◽  
Sand Particles ◽  
Pozzolanic Additives

This work aims to characterize the microstructure of mortars derived from the walls of sacred buildings from the 17th century. The tests were carried out using the X-ray diffraction method, differential thermal analysis and scanning microscopy combined with the analysis of the elemental composition in the micro area. The results of this study show that the materials bonding the elements of the wall in historic buildings are porous sand-lime mortars with an increased binder-to-aggregate ratio, also containing limestone crumbs, flints and feldspars, and fragments of bricks larger than sand particles. The binder is fully carbonated calcium hydroxide, with no pozzolanic additives. The results of the microstructure and phase composition tests of mortars used for bonding wall elements in buildings constructed at the end of the 16th and early 17th centuries can be used to select the composition of mortars used in the renovation and repair of historic buildings.

scholarly journals Физический механизм работы палладий-бариевых катодов СВЧ-приборов

2019 ◽  
Vol 89 (5) ◽  
pp. 771
Author(s):  
В.И. Капустин ◽  
И.П. Ли ◽  
А.В. Шуманов ◽  
С.О. Москаленко ◽  
А.А. Буш ◽  
...  
Keyword(s):  
Phase Composition ◽  
Chemical Analysis ◽  
Cathode Material ◽  
Electron Spectroscopy ◽  
Oxygen Vacancies ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical States ◽  
Electron Energy Loss

AbstractHigh-resolution X-ray diffraction method (XRD) is used to determine sizes and crystallographic orientation of the nanocrystallites of the Pd and Pd_5Ba phases in palladium–barium cathode. Electron spectroscopy for chemical analysis (ESCA) is used to study Ba and Pd chemical states in cathode material and determine the phase composition including dissolved microimpurities in the phases. The comparison of the XRD and ESCA data makes it possible to reveal effects related to the formation of the BaO crystallites in the cathode material, which are responsible for the emission properties. Electron-energy loss spectroscopy is used to determine the concentration of oxygen vacancies in the BaO crystallites that are formed in the cathode material due to activation. An original crystallite model of the working palladium–barium cathodes that is based on the results of this work may serve as an alternative to the known film model and makes it possible to optimize technology of cathode fabrication and activation.

scholarly journals Phase composition of cathodic deposits synthesized in flinak-k2taf7-kbf4 melt

2003 ◽  
Vol 39 (1-2) ◽  
pp. 261-267 ◽  
Author(s):  
O.V. Makarova ◽  
L.P. Polyakova ◽  
E.G. Polyakov ◽  
A.A. Shevyryov ◽  
A.V. Arakcheeva
Keyword(s):  
Phase Composition ◽  
Current Density ◽  
Boron Content ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
Cathodic Potential ◽  
X Ray ◽  
Cathodic Deposits

The phase composition of cathodic deposits synthesized from FLINAK-K2TaF7-KBF4 melt has been studied by the X-ray diffraction method. It is shown that boron content in the electrodeposit grows as the cathodic potential is increased from peak R1 to peak R4 in the voltammogram. The scheme of changes in the phase composition depending on the increasing current density is given as follows: {?-Ta + Ta2B}R1 ? {?-Ta + (Ta3B4 TaB)}R2 ? {TaB2}R3 ? {TaB2 + B}R4.

Spin Reorientation Transition in Nanocrystalline (Pr,Sm)Fe8Ga3C Alloys

2010 ◽  
Vol 168-169 ◽  
pp. 126-129
Author(s):  
A.G. Popov ◽  
D.I. Gorbunov ◽  
G.V. Ivanova ◽  
G.M. Makarova ◽  
A.V. Korolyov
Keyword(s):  
Magnetic Field ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Spin Reorientation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spin Reorientation Transition ◽  
Plane Anisotropy ◽  
Cone Type ◽  
Ordered State

Spin-reorientation transitions in intermetallic (Pr1-xSmx)Fe8Ga3C compounds with the tetragonal BaCd11-type structure have been investigated. The magnetic phase diagram has been proposed for these compounds based on magnetic and X-Ray diffraction studies using their nanocrystalline ribbons and powders aligned in a magnetic field. In the concentration range 0 ≤ x ≤ 0.4 the compounds exhibit an «easy-plane» anisotropy at all temperatures of the magnetically ordered state. The magnetic anisotropy of the compounds with 0.5 ≤ x ≤ 1 is of the «easy-cone» type. The SmFe8Ga3C compound with the highest Sm content is a uniaxial ferromagnet with no indications of a spin-reorientation transition below its Curie temperature.

Magnetic Properties and Structural Transitions in (MnCo)1-xGe

2009 ◽  
Vol 152-153 ◽  
pp. 489-492 ◽  
Author(s):  
P.E. Markin ◽  
N.V. Mushnikov
Keyword(s):  
Magnetic Field ◽  
Structural Transition ◽  
Magnetic Phase ◽  
Hexagonal Phase ◽  
Magnetic Transition ◽  
Entropy Change ◽  
Paramagnetic State ◽  
X Ray Diffraction ◽  
X Ray ◽  
Isothermal Regime

The magnetic and X-ray diffraction measurements of the ferromagnetic compounds (MnCo)1-xGe have been performed for the concentration range 0 ≤ x ≤ 0.05. The structural and magnetic phase diagrams have been obtained. Compositions for which the magnetic transition from ferromagnetic to paramagnetic state coincides with the structural transition from an orthorhombic to a hexagonal phase have been determined to be 0.015 ≤ x ≤ 0.025. It was found that for the compound with x = 0.015 application of 1 T magnetic field in isothermal regime in the vicinity of the Curie temperature is accompanied by the entropy change 1.3 J/(Kkg).

The Stability of CeNi3-Based Intermetallic Hydrides

2015 ◽  
Vol 365 ◽  
pp. 24-29
Author(s):  
Stepan Alexandrovich Lushnikov ◽  
Tatyana Victorovna Filippova
Keyword(s):  
Phase Composition ◽  
Low Temperatures ◽  
Room Temperature ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
Hydrogen Atoms ◽  
X Ray ◽  
The Stability ◽  
Diffusion Of Hydrogen ◽  
Hydride Phases

Hydrides of CeNi3 intermetallic compounds were synthesized with hydrogen at a pressure of up to 50 bars at room and low temperatures. Using the X-ray diffraction method gives phase composition and lattice parameters of the hydride samples. It was revealed that one set of the hydride samples was stable in air and at room temperature, while another set was very unstable at the same conditions and rapidly desorbed hydrogen. This diverse behaviour depends on the proportion of obtained hydride phases at low and room temperatures, coexisting in the samples. A possible explanation has been proposed based on the different diffusion of hydrogen atoms in ordered and disordered hydride phases, incorporated in the samples.

Control of the phase composition of advanced calcium phosphates using an x-ray diffractometer with a curved position-sensitive detector

2020 ◽  
Vol 86 (6) ◽  
pp. 29-35
Author(s):  
V. P. Sirotinkin ◽  
O. V. Baranov ◽  
A. Yu. Fedotov ◽  
S. M. Barinov
Keyword(s):  
Phase Composition ◽  
Calcium Phosphates ◽  
Position Sensitive Detector ◽  
Sensitive Detector ◽  
X Ray Diffraction ◽  
X Ray ◽  
Impurity Phases ◽  
Position Sensitive ◽  
Diffraction Peaks ◽  
Diffraction Patterns

The results of studying the phase composition of advanced calcium phosphates Ca10(PO4)6(OH)2, β-Ca3(PO4)2, α-Ca3(PO4)2, CaHPO4 · 2H2O, Ca8(HPO4)2(PO4)4 · 5H2O using an x-ray diffractometer with a curved position-sensitive detector are presented. Optimal experimental conditions (angular positions of the x-ray tube and detector, size of the slits, exposure time) were determined with allowance for possible formation of the impurity phases during synthesis. The construction features of diffractometers with a position-sensitive detector affecting the profile characteristics of x-ray diffraction peaks are considered. The composition for calibration of the diffractometer (a mixture of sodium acetate and yttrium oxide) was determined. Theoretical x-ray diffraction patterns for corresponding calcium phosphates are constructed on the basis of the literature data. These x-ray diffraction patterns were used to determine the phase composition of the advanced calcium phosphates. The features of advanced calcium phosphates, which should be taken into account during the phase analysis, are indicated. The powder of high-temperature form of tricalcium phosphate strongly adsorbs water from the environment. A strong texture is observed on the x-ray diffraction spectra of dicalcium phosphate dihydrate. A rather specific x-ray diffraction pattern of octacalcium phosphate pentahydrate revealed the only one strong peak at small angles. In all cases, significant deviations are observed for the recorded angular positions and relative intensity of the diffraction peaks. The results of the study of experimentally obtained mixtures of calcium phosphate are presented. It is shown that the graphic comparison of experimental x-ray diffraction spectra and pre-recorded spectra of the reference calcium phosphates and possible impurity phases is the most effective method. In this case, there is no need for calibration. When using this method, the total time for analysis of one sample is no more than 10 min.

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