scholarly journals PHYSICAL AND CHEMICAL STUDY OF THE BI2TE3-ER2TE3 SYSTEM AND THE PROPERTIES OF THE FORMED PHASES

2021 ◽  
pp. 37-40
Author(s):  
F. Sadygov ◽  
T. Ilyasly ◽  
Z. Ismailov ◽  
R. Mirzoeva ◽  
S. Mamedova ◽  
...  
Keyword(s):  
Ternary System ◽  
Ternary Compound ◽  
Room Temperature ◽  
Hexagonal Lattice ◽  
Chemical Study ◽  
Electrophysical Properties ◽  
X Ray ◽  
System A ◽  
Physical And Chemical

The Bi2Te3-Er2Te3 section of the Er-Bi-Te ternary system was investigated by the methods of differential thermal, X-ray phase and microstructural analyzes and also by measuring the microhardness and density. In the system, a ternary compound of the composition ErBiTe3 is formed, which crystallizes in a hexagonal lattice with the following parameters: a = 4,20; c = 31,11Å (c / a = 7,1) The solubility on the side of Bi2Te3 is 6 mol% at room temperature. The electrophysical properties of ErBiTe3 compounds have been studied.

Electron Microscope study of commensurate-incommensurate phase transition in BaZnGeO4

1990 ◽  
Vol 48 (4) ◽  
pp. 172-173
Author(s):  
Naoki Yamamoto ◽  
Makoto Kikuchi ◽  
Tooru Atake ◽  
Akihiro Hamano ◽  
Yasutoshi Saito
Keyword(s):  
Phase Transition ◽  
Electron Microscope Study ◽  
Room Temperature ◽  
Hexagonal Lattice ◽  
Ferroelectric Materials ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Periodic Arrays ◽  
Modulation Wave Vector

BaZnGeO4 undergoes many phase transitions from I to V phase. The highest temperature phase I has a BaAl2O4 type structure with a hexagonal lattice. Recent X-ray diffraction study showed that the incommensurate (IC) lattice modulation appears along the c axis in the III and IV phases with a period of about 4c, and a commensurate (C) phase with a modulated period of 4c exists between the III and IV phases in the narrow temperature region (—58°C to —47°C on cooling), called the III' phase. The modulations in the IC phases are considered displacive type, but the detailed structures have not been studied. It is also not clear whether the modulation changes into periodic arrays of discommensurations (DC’s) near the III-III' and IV-V phase transition temperature as found in the ferroelectric materials such as Rb2ZnCl4.At room temperature (III phase) satellite reflections were seen around the fundamental reflections in a diffraction pattern (Fig.1) and they aligned along a certain direction deviated from the c* direction, which indicates that the modulation wave vector q tilts from the c* axis. The tilt angle is about 2 degree at room temperature and depends on temperature.

Ferromagnetism in MgTiO3-Ti2O3 Solid Solutions

2011 ◽  
Vol 700 ◽  
pp. 23-27 ◽  
Author(s):  
Yukari Fujioka ◽  
Johannes Frantti ◽  
Risto M. Nieminen
Keyword(s):  
Room Temperature ◽  
Hexagonal Lattice ◽  
Hysteresis Loops ◽  
Magnetic Impurities ◽  
X Rays ◽  
X Ray ◽  
Cation Layer ◽  
Ferromagnetic Hysteresis ◽  
Secondary Ion ◽  
Ti Content

Ti-rich Mg1ЎxTi1+xO3 samples were synthesized by solid-state reaction. Sampleswere characterized by room temperature x-ray powder di®raction, scanning electron microscopyand energy dispersive spectroscopy of x-rays. Hexagonal lattice parameters a and c increasedwith increasing Ti content. Time-of-Flight-Secondary-Ion-Mass-Spectroscopy (ToF-SIMS, de-tection limit 10Ў6) measurements revealed that no magnetic impurities were present. Sampleswith x = 0:10; 0:12 and 0:32 showed ferromagnetic hysteresis loops. The result demonstratesthat excess Ti at the Mg-O cation layer controls the magnetic properties. This is a technologicaladvantage especially for thin Їlm applications.

Phase Equilibria in the BaO-SiO2-Al2O3 Ternary System at 1500 °C

2016 ◽  
Vol 697 ◽  
pp. 565-571 ◽  
Author(s):  
Rui Zhang ◽  
Pekka Taskinen
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ternary System ◽  
Phase Equilibria ◽  
Ternary Compound ◽  
Energy Dispersive Analysis ◽  
Liquidus Composition ◽  
Isothermal Sections ◽  
X Ray ◽  
Scanning Electron

Phase equilibria of the BaO-SiO2-Al2O3 ternary system was experimentally investigated using a quenching technique and analyzed by Scanning Electron Microscopy (SEM) equipped with Energy Dispersive Analysis (EDS) and X-ray Powder Diffraction (XRD). A ternary compound was confirmed in the present work. The liquidus composition in equilibrium with the ternary compound at 1500 °C were quantified. The isothermal sections of the BaO-SiO2-Al2O3 ternary system at 1400 °C, 1500 °C, 1600 °C, and 1700 °C were calculated. Based on the data acquired, the isothermal section at 1500 °C was constructed.

STUDY ON PHASE DIAGRAM OF BaO-Y2O3-CuO TERNARY SYSTEM

1987 ◽  
Vol 01 (02) ◽  
pp. 363-365 ◽  
Author(s):  
Guangcan Che ◽  
Jingkui Liang ◽  
Wei Chen ◽  
Sishen Xie ◽  
Yude Yu ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Ternary System ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor

In Ba-R-Cu-O system (R=La, Y) , high Tc superconductor have been discovered (1–3). The room temperature section of the phase diagram in BaO-Y2O3-CuO system has been completed by means of X-ray diffraction, thermal analysis and superconducting measurements.

scholarly journals Combustion synthesis in the Ni–Al–Nb ternary system: A Time-Resolved X-ray Diffraction study

2017 ◽  
Vol 7 ◽  
pp. 1878-1882 ◽  
Author(s):  
Alexander E. Sytschev ◽  
Dmitry Yu. Kovalev ◽  
Dominique Vrel ◽  
Sergey G. Vadchenko
Keyword(s):  
Ternary System ◽  
Diffraction Study ◽  
Combustion Synthesis ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
System A

X-Ray Absorption at Si K-Edge for Novel Compounds in the Ternary System Si-C-N

1996 ◽  
Vol 437 ◽  
Author(s):  
P. Kroll ◽  
A. Greiner ◽  
R. Riedel ◽  
S. Bender ◽  
R. Franke ◽  
...  
Keyword(s):  
Composite Material ◽  
Ternary System ◽  
Crystalline Phase ◽  
Room Temperature ◽  
X Ray ◽  
Solid Phases ◽  
X Ray Absorption

AbstractWe present results of Si K-edge XANES-investigations for novel Si-C-N containing solid phases prepared by annealing of Si(NCN)2 at temperatures between room temperature (RT) and 1600°C. The chemical equivalence of the NCN-group arid oxygen as a ligand of silicon is confirmed. The spectra show the presence of an intermediate crystalline phase and its decomposition. Furthermore the recrystallisation of a Si3N4/SiC composite material and its dependence on temperature can be seen.

Darstellung und Schwingungsspektren von Thiotrichlorosilicat und -germanat. Die Kristallstruktur von NEt4[SiSCl3] · 0,5 CCl4/ Preparation and Synthesis of Thiotrichloro Silicate and Germanate. Crystal Structure of NEt4[SiSCl3] · 0.5 CCl4

1985 ◽  
Vol 40 (8) ◽  
pp. 1015-1019 ◽  
Author(s):  
Ulrich Müller ◽  
Volker Krug
Keyword(s):  
Crystal Structure ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Positional Disorder ◽  
Rotation Axes ◽  
System A ◽  
Tetragonal System ◽  
Anionic Species ◽  
Raman And Ir Spectra

AbstractNEt4[SiSCl3] · 0.5CCl4 was obtained from NEt4SH and SiCl4 in liquid H2S and subsequent crystallization from CH2Cl2/CCl4. The analogous reaction with GeCl4 was performed without solvent at room temperature. Raman and IR spectra are in accord with simple anionic species with C3v symmetry. The crystal structure of NEt4[SiSCl3] · 0.5 CCl4 was determined from X-ray diffraction data (849 independent observed reflexions, R - 0.030). Crystal data: tetragonal, space group P4̄c2 , Z = 4, a = 1196.0, c = 1200.7 pm. Both, cation and anion occupy positions on twofold rotation axes, with the consequence of positional disorder for the [SiSCl3]- ion by statistical superposition of the sulfur and one chlorine position. The general packing of cations and anions resembles the NaCl type, the CCl4 molecules occupying interstices. NEt4[GeSCl3] · 0.5 CCl4 is isotypic (a = 1204, c = 1201 pm); NEt4[GeSCl3] also crystallizes in the tetragonal system (a = 1048.4, c = 1274.4 pm).

PHYSICAL AND CHEMICAL STUDY OF THE SALT SYSTEM TYPE 2 || 3

2021 ◽  
Author(s):  
Яха Назирбековна Сириева
Keyword(s):  
Thermal Characteristics ◽  
Reciprocal System ◽  
Chemical Study ◽  
Physicochemical Analysis ◽  
Component System ◽  
System A ◽  
System Type ◽  
Invariant Points ◽  
Physical And Chemical

В статье дана схема развертки и выявлены фазовые единичные блоки (ФЕБы), по которым построено ее древо фаз, приводятся результаты исследования дифференциация четверной взаимной системы. Комплексом методов физико-химического анализа, в частности визуально-политермическим, дифференциальным термическим, изучены термические характеристики процессов фазообразования в четырехкомпонентной системе. Показано, что в них реализуются как эвтектические, так и перитектические нонвариантные точки. The article provides a sweep scheme and identifies the phase unit blocks (FEBs), according to which its phase tree is constructed, provides the results of the study of the differentiation of the quadruple reciprocal system. A complex of methods of physicochemical analysis, in particular, visual-polythermal, differential thermal, studied the thermal characteristics of the processes of phase formation in a four-component system. It is shown that both eutectic and peritectic invariant points are realized in them.

Electron Microscopy of Human Gallstones

1971 ◽  
Vol 29 ◽  
pp. 296-297
Author(s):  
C. Wolpers ◽  
R. Blaschke
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bile Pigment ◽  
X Ray Diffraction ◽  
Triclinic Crystal System ◽  
X Ray ◽  
Follow Up Study ◽  
Infra Red ◽  
Main Components

Scanning microscopy was used to study the surface of human gallstones and the surface of fractures. The specimens were obtained by operation, washed with water, dried at room temperature and shadowcasted with carbon and aluminum. Most of the specimens belong to patients from a series of X-ray follow-up study, examined during the last twenty years. So it was possible to evaluate approximately the age of these gallstones and to get information on the intensity of growing and solving.Cholesterol, a group of bile pigment substances and different salts of calcium, are the main components of human gallstones. By X-ray diffraction technique, infra-red spectroscopy and by chemical analysis it was demonstrated that all three components can be found in any gallstone. In the presence of water cholesterol crystallizes in pane-like plates of the triclinic crystal system.

Opening images of synaptic vesicles and calcium localization by means of microwave fixation method

1990 ◽  
Vol 48 (2) ◽  
pp. 182-183
Author(s):  
Vinci Mizuhira ◽  
Hiroshi Hasegawa
Keyword(s):  
Synaptic Vesicles ◽  
Room Temperature ◽  
Osmium Tetroxide ◽  
Sampling Procedure ◽  
Fixation Method ◽  
Potassium Oxalate ◽  
X Ray ◽  
Cacodylate Buffer ◽  
Ultrathin Sections ◽  
Microwave Fixation

Microwave irradiation (MWI) was applied to 0.3 to 1 cm3 blocks of rat central nervous system at 2.45 GHz/500W for about 20 sec in a fixative, at room temperature. Fixative composed of 2% paraformaldehyde, 0.5% glutaraldehyde in 0.1 M cacodylate buffer at pH 7.4, also contained 2 mM of CaCl2 , 1 mM of MgCl2, and 0.1% of tannic acid for conventional observation; and fuether 30-90 mM of potassium oxalate containing fixative was applied for the detection of calcium ion localization in cells. Tissue blocks were left in the same fixative for 30 to 180 min after MWI at room temperature, then proceeded to the sampling procedure, after postfixed with osmium tetroxide, embedded in Epon. Ultrathin sections were double stained with an useal manner. Oxalate treated sections were devided in two, stained and unstained one. The later oxalate treated unstained sections were analyzed with electron probe X-ray microanalyzer, the EDAX-PU-9800, at 40 KV accelerating voltage for 100 to 200 sec with point or selected area analyzing methods.

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