Conditions for the existence of potassium antimonates with a M(I): Sb ratio greater than one

1981 ◽  
Vol 46 (12) ◽  
pp. 3074-3082 ◽  
Author(s):  
Milan Drátovský ◽  
Jiří Karlíček
Keyword(s):  
Ternary System ◽  
Ir Spectra ◽  
Active Compound ◽  
Compound K ◽  
X Ray ◽  
Solubility Study ◽  
Tetrahedral System

During a solubility study on the ternary system KOH-KSbO3-H2O, a method was found for the preparation of the crystalline (X-ray active) compound KSbO3.2.3 H2O and a new compound, K4Sb2O7.(5.6-5.8) H2O, was discovered. Both of these substances and an anhydrous substance with composition K4Sb2O7 crystallize in the tetrahedral system. Their constitution was characterized on the basis of their IR spectra.

scholarly journals New Insights into the Crystal Chemistry of Elpidite, Na2Zr[Si6O15]·3H2O and (Na1+YCax□1−X−Y)Σ=2Zr[Si6O15]·(3−X)H2O, and Ab Initio Modeling of IR Spectra

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2160
Author(s):  
Alexander Bogdanov ◽  
Ekaterina Kaneva ◽  
Roman Shendrik
Keyword(s):  
Ir Spectra ◽  
Structural Models ◽  
Chemical Characterization ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
Special Group ◽  
X Ray ◽  
Influence Of Water ◽  
Radioactive Species

Elpidite belongs to a special group of microporous zirconosilicates, which are of great interest due to their capability to uptake various molecules and ions, e.g., some radioactive species, in their structural voids. The results of a combined electron probe microanalysis and single-crystal X-ray diffraction study of the crystals of elpidite from Burpala (Russia) and Khan-Bogdo (Mongolia) deposits are reported. Some differences in the chemical compositions are observed and substitution at several structural positions within the structure of the compounds are noted. Based on the obtained results, a detailed crystal–chemical characterization of the elpidites under study was carried out. Three different structure models of elpidite were simulated: Na2ZrSi6O15·3H2O (related to the structure of Russian elpidite), partly Ca-replaced Na1.5Ca0.25ZrSi6O15·2.75H2O (close to elpidite from Mongolia), and a hypothetical CaZrSi6O15·2H2O. The vibration spectra of the models were obtained and compared with the experimental one, taken from the literature. The strong influence of water molecule vibrations on the shape of IR spectra of studied structural models of elpidite is discussed in the paper.

Luminescent Properties of Zn2SiO4:Eu3+,Dy3+ Phosphors via Sol-Gel Process

2012 ◽  
Vol 217-219 ◽  
pp. 733-736
Author(s):  
Xiu Mei Han ◽  
Shu Ai Hao ◽  
Ying Ling Wang ◽  
Gui Fang Sun ◽  
Xi Wei Qi
Keyword(s):  
Thermal Analysis ◽  
Ir Spectra ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sol Gel Process ◽  
Ft Ir

Zn2SiO4:Eu3+, Dy3+ phosphors have been prepared through the sol-gel process. X-ray diffraction (XRD), thermogravimetric and ddifferential thermal analysis (TG-DTA), FT-IR spectra and photoluminescence spectra were used to characterize the resulting phosphors. The results of XRD indicated that the phosphors crystallized completely at 1000oC. In Zn2SiO4:Eu3+,Dy3+ phosphors, the Eu3+ and Dy3+ show their characteristic red(613nm, 5D0-7F2), blue (481nm, 4F9/2–6H15/2) and yellow (577nm, 4F9/2–6H13/2) emissions.

scholarly journals Laboratory EXAFS determined structure of the stable complexes in the ternary Ni(ii)–EDTA–CN− system

2019 ◽  
Vol 21 (18) ◽  
pp. 9239-9245 ◽  
Author(s):  
Zoltán Németh ◽  
Éva G. Bajnóczi ◽  
Bogdán Csilla ◽  
György Vankó
Keyword(s):  
Ternary System ◽  
Aqueous Solutions ◽  
Absorption Spectroscopy ◽  
Cyanide Concentration ◽  
X Ray ◽  
System P ◽  
X Ray Absorption

Aqueous solutions of the ternary system Ni(ii)–EDTA–CN− are investigated with X-ray Absorption Spectroscopy (XAS) as a function of cyanide concentration with an enhanced laboratory von Hámos X-ray spectrometer.

scholarly journals Preparation, Structural, Electrical, and Ferroelectric Properties of Lead Niobate–Lead Zirconate–Lead Titanate Ternary System

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Rashmi Gupta ◽  
Seema Verma ◽  
Vishal Singh ◽  
K. K. Bamzai
Keyword(s):  
Dielectric Constant ◽  
Ternary System ◽  
Lead Titanate ◽  
Ac Conductivity ◽  
Perovskite Phase ◽  
Ferroelectric Properties ◽  
Ternary Systems ◽  
Lead Zirconate ◽  
X Ray ◽  
Dispersive Nature

A ternary system of lead niobate–lead zirconate–lead titanate with composition xPN–yPZ–(x-y)PT where x=0.5 and y=0.15, 0.25, and 0.35 known as PNZT has been prepared by conventional mixed oxide route at a temperature of 1100°C. The formation of the perovskite phase was established by X-ray diffraction analysis. The surface morphology studied by scanning electron microscopy shows the formation of fairly dense grains and elemental composition was confirmed by energy dispersive X-ray analysis. Dielectric properties like dielectric constant and dielectric loss (ε′ and tan⁡δ) indicate poly-dispersive nature of the material. The temperature dependent dielectric constant (ε′) curve indicates relaxor behaviour with two dielectric anomalies. The poly-dispersive nature of the material was analysed by Cole-Cole plots. The activation energy follows the Arrhenius law and is found to decrease with increasing frequency for each composition. The frequency dependence of ac conductivity follows the universal power law. The ac conductivity analysis suggests that hopping of charge carriers among the localized sites is responsible for electrical conduction. The ferroelectric studies reveal that these ternary systems are soft ferroelectric.

[1,4,2]Diazaphospholidine / [1,4,2]Diazaphospholidines

1988 ◽  
Vol 43 (11) ◽  
pp. 1481-1489 ◽  
Author(s):  
Ekkehard Fluck ◽  
Peter Kuhm ◽  
Heinz Riffel
Keyword(s):  
Ir Spectra ◽  
Structure Analysis ◽  
Title Compound ◽  
X Ray ◽  
New Compounds

Abstract Bis(diethylamino)phosphanylacetylen reacts with N.N′-dimethyl thiourea to give 2-diethyl-amino-1,4-dimethyl-3-methylene-[1,4,2]diazaphospholidine-5-thion (2) besides the [1,3,4]thiazaphospholidine (1). The latter compound is converted into 2 by heating. Reaction of 2 with various reagents yields other members of the title compound class. All new compounds are characterized by some reactions and their NMR and IR spectra. In addition, the results of an X-ray structure analysis of 2-diethylamino-l ,4-dimethyl-3-methylene-2-thioxo-[1,4,2]diazaphos-pholidine-5-thion (5) are reported.

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