scholarly journals Calcium, Strontium And Barium Titanates As Photacatalysts

2019 ◽  
Vol 1221 ◽  
pp. 012006
Author(s):  
H E Solís Correa ◽  
I D Barceló Quintal ◽  
A M Valdés Espinosa
Keyword(s):  
Barium Titanates

Rare earth element-bearing tausonite and potassium barium titanates from the Little Murun potassic alkaline complex, Yakutia, Russia

1993 ◽  
Vol 57 (389) ◽  
pp. 651-664 ◽  
Author(s):  
Roger H. Mitchell ◽  
Nikolai V. Vladykin
Keyword(s):  
Rare Earth ◽  
Compositional Data ◽  
Magma Mixing ◽  
Dynamic Environment ◽  
Potassium Feldspar ◽  
Simple Relationship ◽  
Alkaline Complex ◽  
Compositional Zoning ◽  
Barium Titanates ◽  
Textural Evidence

AbstractTausonites occurring in aegirine potassium feldspar syenite from the Little Murun potassic alkaline complex are characterised by complex growth and resorption features. These are attributed to nonequilibrium crystallisation in a dynamic environment characterised by magma mixing and/or volatile degassing. The crystals represent a transported assemblage which has no simple relationship to the magma from which their host rock crystallised. Tausonites exhibit significant normal, reverse and oscillatory compositional zoning with respect to strontium and the rare earth elements. The compositions are unique, ranging from tausonite to strontian cerian loparite, and are unlike those found in strontian perovskites from lamproites and fenites associated with carbonatites.Compositional data are presented for Ba-rich titanates belonging to the hollandite group, Ba(Ti,Fe)5O11 and K2Ti13O27. The titanates, on the basis of textural evidence, are interpreted to have formed by the reaction of K-Ba-rich residual liquids with pre-existing Ti-magnetite, ilmenite and tausonite. The compositions of the titanates are similar to those of primary titanates found in kimberlites and carbonatites.

Raman spectroscopy study of lattice dynamics of macro-, micro-, and nanostructured barium titanates

2014 ◽  
Vol 56 (2) ◽  
pp. 310-316 ◽  
Author(s):  
O. A. Maslova ◽  
F. V. Shirokov ◽  
Yu. I. Yuzyuk ◽  
M. El Marssi ◽  
M. Jain ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Lattice Dynamics ◽  
Spectroscopy Study ◽  
Barium Titanates

Prediction of the physical properties of barium titanates using an artificial neural network

2017 ◽  
Vol 123 (4) ◽  
Author(s):  
Ahmed Jaafar Abed Al-Jabar ◽  
Mohammed Assi Ahmed Al-dujaili ◽  
Imad Ali Disher Al-hydary
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Physical Properties ◽  
Barium Titanates ◽  
Artificial Neural

Synthesis and characterization of mixed-valence barium titanates

2003 ◽  
Vol 83 (2) ◽  
pp. 165-178 ◽  
Author(s):  
Thomas Höche ◽  
Paula Olhe ◽  
Ralf Keding ◽  
Christian Rüssel ◽  
Peter A. Van Aken ◽  
...  
Keyword(s):  
Mixed Valence ◽  
Synthesis And Characterization ◽  
Barium Titanates

Modeling the Relationship between Process Parameters and Bulk Density of Barium Titanates

2019 ◽  
Vol 26 (5) ◽  
pp. 369-374
Author(s):  
Sang Eun Park ◽  
Hong In Kim ◽  
Jeoung Han Kim ◽  
N. S. Reddy
Keyword(s):  
Bulk Density ◽  
Process Parameters ◽  
Barium Titanates ◽  
The Relationship

Rare Earth Metal Doped Barium Titanates

2008 ◽  
Vol 589 ◽  
pp. 143-148
Author(s):  
T. Radoczy ◽  
Kristof Kovacs ◽  
N. Sarzo
Keyword(s):  
Dielectric Constant ◽  
Rare Earth ◽  
Earth Metal ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wet Chemical Synthesis ◽  
Barium Titanates ◽  
Semiconducting Properties ◽  
Wet Chemical ◽  
Metal Doped

High purity as well as Ce-, Pr- and Y-doped polycrystalline BaTiO3 ceramics were prepared by wet chemical synthesis. Dielectric constant as well as dielectric loss of dry pressed and sintered ceramics show dielectric constant above 20000 for samples containing 0.5 % Ce accompanied by semiconducting properties. X-ray diffraction studies confirmed Ti being substituted by Ce an Y, while Pr substitutes Ba ions.

Crystallization and Properties of Glass-Ceramics of the K2O-BaO-B2O3-Al2O3-TiO2 System

2013 ◽  
Vol 755 ◽  
pp. 125-132
Author(s):  
M.A. González ◽  
Alexander Gorokhovsky ◽  
J.I. Escalante ◽  
P. Ponce ◽  
M.A. Escobedo
Keyword(s):  
Crystallization Behavior ◽  
Glass Ceramics ◽  
Chemical Durability ◽  
Mechanical Resistance ◽  
Dielectric Losses ◽  
Initial Composition ◽  
Barium Titanates ◽  
Group 2 ◽  
Potassium Titanates ◽  
Group 1

Crystallization behavior and properties of glass-ceramics with content (mol%) of: K2O = 3-25, BaO = 3-27, B2O3= 8-26, Al2O3= 13-18, and TiO2= 31-47 were studied. The relation between the initial composition and the formation of the crystalline phases was analyzed. When increasing [Al2O3] and [BaO], was increased the temperature of crystallization; likewise, different barium potassium titanates appeared with [BaO] = 3-13 (Group 1), whereas, different barium titanates were obtained with [BaO] =13-30 (Group 2). The influence of chemical composition on the properties of density, mechanical strength, chemical durability and dielectric properties (dielectric constant and dielectric losses), was discussed. Glass-ceramics with high mechanical resistance in the range of 189-480 MPa and permittivity values between 4.03 and 25.31, and dielectric losses < 2 x 10-4at 1MHz were produced.

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