Constant Composition Groups in Glass of Sodium–Borate Systems According to the Data of X-Ray Diffractometry

2019 ◽  
Vol 45 (3) ◽  
pp. 191-194
Author(s):  
O. V. Yanush ◽  
P. A. Onushchenko ◽  
G. A. Sycheva
Keyword(s):  
Sodium Borate ◽  
Constant Composition ◽  
X Ray ◽  
Borate Systems

Leaching Studies of Cement-Glass Package Containing Sodium Borate

1986 ◽  
Vol 84 ◽  
Author(s):  
Masahiro Okamoto ◽  
Koichi Chino ◽  
Tsutomu Baba ◽  
Tatsuo Izumida ◽  
Fumio Kawamura ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Liquid Waste ◽  
Sodium Borate ◽  
Pressurized Water Reactor ◽  
X Ray Diffraction ◽  
Adsorption Ability ◽  
Pressurized Water ◽  
X Ray ◽  
Solidification Reaction ◽  
Main Components

AbstractA new solidification technique using cement-glass, which is a mixture of sodium silicate, cement, additives, and initiator of the solidification reaction, was developed for sodium borate liquid waste generated from pressurized water reactor (PWR) plants. The cement-glass could solidify eight times as much sodium borate as cement could, because the solidifying reaction of the cement-glass is not hindered by borate ions.The reaction mechanism of sodium silicate and phosphoric silicate (initiator), the main components of cement-glass, was studied through X-ray diffraction and compressive strength measurements. It was found that three- dimensionally bonded silicon dioxide was produced by polymerization of the two silicates. The leaching ratio of cesium from the cement-glass package was one-tenth that of the cement one. This low value was attributed to a high cesium adsorption ability of the cement-glass and it could be theoretically predicted accordingly.

scholarly journals Effects of sodium roasting on the leaching rate of boron-bearing tailings and its mechanism analysis

2018 ◽  
Vol 5 (8) ◽  
pp. 172342
Author(s):  
Chengxi Zou ◽  
Zhenyu Tang ◽  
Wei Xie ◽  
Hanguang Fu ◽  
Jiacai Kuang ◽  
...  
Keyword(s):  
Scientific Basis ◽  
Raw Material ◽  
Sodium Borate ◽  
Mechanism Analysis ◽  
Leaching Rate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Roasting Process ◽  
Roasting Temperature ◽  
Theoretical Amount

The study reported was intended to improve the leaching rate of boron-bearing tailings, using a method of sodium roasting that uses boron-bearing tailings as the raw material and Na 2 CO 3 as the sodium agent. The effects of the roasting temperature and Na 2 CO 3 amount on the leaching rate of boron-bearing tailings are mainly evaluated. The morphology and composition of the samples after sodium roasting are analysed by scanning electron microscopy and X-ray diffraction. The results show that sodium roasting can significantly improve the leaching rate of boron-bearing tailings. Under the optimal conditions where roasting temperature is 950°C, Na 2 CO 3 amount is five times the theoretical amount and roasting time is 2 h, the leaching rate of boron-bearing tailings is up to 86.78%. Based on the analysis of the characterization results and the mechanism analysis of the sodium roasting process, the main reason for the increase of leaching rate is the reaction between Na 2 O produced by the decomposition of Na 2 CO 3 and the boron in boron-bearing tailings resulting in soluble sodium borate. The results provide a scientific basis for the efficient comprehensive use of boron-bearing tailings.

Principles and Performance of a PC-Based Program for Simulation of Double-Axis X-Ray Rocking Curves of Thin Epitaxial Films

1990 ◽  
Vol 208 ◽  
Author(s):  
D. Keith Bowen ◽  
Neil Loxley ◽  
Brian K. Tanner ◽  
Lynne Cooke ◽  
Michael A. Capano
Keyword(s):  
Simulated Data ◽  
Peak Position ◽  
Interface Roughness ◽  
Quadratic Functions ◽  
Bench Mark ◽  
Epitaxial Thin Films ◽  
Constant Composition ◽  
X Ray ◽  
Graded Layers ◽  
And Performance

ABSTRACTPC-based software for the rapid simulation of double-axis X-ray rocking curves from epitaxial thin films by solution of the Takagi-Taupin equations is described. The principles of the mathematical model are discussed. Graded layers and interface roughness are treated by piece-wise approximation to linear or quadratic functions and fractional relaxation of each epilayer may be included. The reliability of the data-bases incororated are examined and the requirement for internal consistency demonstrated. Bench-mark tests are reported for various PC-compatible microcomputers. The shift in epilayer peak position, which occurs experimentally on reducing layer thickness at constant composition, is predicted in the simulations and compared with other simulated data in the literature. Detailed studies of generated data have been undertaken and compared with independent simulations and experimental data. Agreement is excellent.

Physical and optical properties of sodium borate glasses doped with Dy3+ ions

2017 ◽  
Vol 31 (23) ◽  
pp. 1750171 ◽  
Author(s):  
Y. S. M. Alajerami ◽  
K. M. Abushab ◽  
S. I. Alagha ◽  
M. H. A. Mhareb ◽  
A. Saidu ◽  
...  
Keyword(s):  
Physical Properties ◽  
Oscillator Strengths ◽  
Sodium Borate ◽  
Blue Color ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
Hypersensitive Transition ◽  
X Ray ◽  
Yellow Color ◽  
Polaron Radius

The photoluminescence, optical and physical properties of sodium borate (NB) doped with different concentrations of Dy[Formula: see text] were determined and well discussed. The samples were prepared by the melt-quenching technique and characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Photoluminescence and absorption spectra of NB glasses doped with different concentrations of Dy[Formula: see text] are reported. Ten absorption bands with hypersensitive transition at 1272 nm ([Formula: see text] [Formula: see text][Formula: see text]) and two emission bands for the transitions at [Formula: see text] [Formula: see text][Formula: see text] (blue color) and [Formula: see text] [Formula: see text][Formula: see text] (yellow color) with an excitation of 330 nm have been recorded. A series of considerable physical properties (oscillator strengths, refractive index, ions concentration, polaron radius) was calculated for each dopant concentration.

X-ray structural investigation on sodium borate samples prepared by the sol-gel method

1994 ◽  
Vol 29 (5) ◽  
pp. 1330-1335 ◽  
Author(s):  
M. P. Medda ◽  
A. Musinu ◽  
G. Piccaluga ◽  
G. Pinna
Keyword(s):  
Structural Investigation ◽  
Sol Gel ◽  
Sodium Borate ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method

X-Ray Study on the Boron Coordination in Sodium Borate Glasses at Higher Temperatures

1986 ◽  
Vol 93 (1) ◽  
pp. K5-K8 ◽  
Author(s):  
M. Derno ◽  
G. Herms ◽  
H. Steil
Keyword(s):  
Sodium Borate ◽  
Borate Glasses ◽  
X Ray

Drug Delivery Systems Based on Hydroxyapaptite-coated Poly(lactic-co-glycolic acid) Microspheres

2007 ◽  
Vol 1063 ◽  
Author(s):  
Qingguo Xu ◽  
Jan T Czernuszka
Keyword(s):  
Drug Release ◽  
Sustained Release ◽  
Glycolic Acid ◽  
Ion Beam ◽  
Sodium Dodecyl ◽  
Plga Microspheres ◽  
Constant Composition ◽  
Drug Release Profile ◽  
X Ray

ABSTRACTNegatively charged poly(lactic-co-glycolic acid) (PLGA) microspheres were prepared by the solid-in-oil-in-water (s/o/w) method using the anionic surfactant, sodium dodecyl sulfate (SDS), and a hydrophilic antibiotic (amoxicillin) was encapsulated with an encapsulation efficiency of 40.6%. A layer of hydroxyapatite (HA) was coated on these negatively charged PLGA microspheres by a dual constant composition method in 3 - 6 hours. The HA-coated PLGA microspheres (HPLG) had a core-shell structure and were characterised by scanning electron microscopy, focused ion beam microscopy, energy-dispersive X-ray spectrometry, X-ray diffraction and Fourier transform infrared spectroscopy. Sustained release of amoxicillin from HPLG for at least 31 days was shown from in-vitro drug release experiments. A typical triphasic drug release profile had been observed for PLGA and HPLG microspheres. This device exhibited two desirable properties: the sustained release from PLGA and osteoconductivity from HA. Hence, it could have potential applications in delivering drugs to treat bone disorders or infections.

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