Synthesis of weakly-agglomerated luminescent CaWO4:Nd3+ particles by modified Pechini method

2021 ◽  
Author(s):  
Vassily A. Medvedev ◽  
Irina M. Shubina ◽  
Ilya E. Kolesnikov ◽  
Erkki Lahderanta ◽  
Mikhail D. Mikhailov ◽  
...  
Keyword(s):  
Pechini Method ◽  
Modified Pechini Method

X-ray powder diffraction data of LaNi0.5Ti0.45Co0.05O3, LaNi0.45Co0.05Ti0.5O3, and LaNi0.5Ti0.5O3 perovskites

2021 ◽  
pp. 1-6
Author(s):  
Mariana M. V. M. Souza ◽  
Alex Maza ◽  
Pablo V. Tuza
Keyword(s):  
Crystal Structure ◽  
Rietveld Method ◽  
Pechini Method ◽  
Powder Diffraction Data ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Modified Pechini Method ◽  
Scanning Electron

In the present work, LaNi0.5Ti0.45Co0.05O3, LaNi0.45Co0.05Ti0.5O3, and LaNi0.5Ti0.5O3 perovskites were synthesized by the modified Pechini method. These materials were characterized using X-ray fluorescence, scanning electron microscopy, and powder X-ray diffraction coupled to the Rietveld method. The crystal structure of these materials is orthorhombic, with space group Pbnm (No 62). The unit-cell parameters are a = 5.535(5) Å, b = 5.527(3) Å, c = 7.819(7) Å, V = 239.2(3) Å3, for the LaNi0.5Ti0.45Co0.05O3, a = 5.538(6) Å, b = 5.528(4) Å, c = 7.825(10) Å, V = 239.5(4) Å3, for the LaNi0.45Co0.05Ti0.5O3, and a = 5.540(2) Å, b = 5.5334(15) Å, c = 7.834(3) Å, V = 240.2(1) Å3, for the LaNi0.5Ti0.5O3.

Synthesis and Characterization of Multiferroic NiFe2O4/BiFeO3 Nanocomposites by Modified Pechini Method

2011 ◽  
Vol 197-198 ◽  
pp. 456-459
Author(s):  
Xian Ming Liu ◽  
Wen Liang Gao
Keyword(s):  
Pechini Method ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Magnetic Bias ◽  
Field Frequency ◽  
Magnetic Field Frequency ◽  
X Ray ◽  
Structure And Morphology ◽  
Modified Pechini Method

Spinel-perovskite multiferroics of NiFe2O4/BiFeO3 nanoparticles were prepared by modified Pechini method. The structure and morphology of the composites were examined by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the composites consisted of spinel NiFe2O4 and perovskite BiFeO3 after annealed at 700°C for 2h, and the particle size ranges from 40 to 100nm. VSM and ME results indicated that the nanocomposites exhibited both tuning magnetic properties and a ME effect. The ME effect of the nanocomposites strongly depended on the magnetic bias and magnetic field frequency.

SrSnO3 perovskite obtained by the modified Pechini method—Insights about its photocatalytic activity

2019 ◽  
Vol 369 ◽  
pp. 181-188 ◽  
Author(s):  
Ana Rita Ferreira Alves Teixeira ◽  
Alex de Meireles Neris ◽  
Elson Longo ◽  
José Rodrigues de Carvalho Filho ◽  
Amer Hakki ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Pechini Method ◽  
Modified Pechini Method

scholarly journals Electrical and Dielectric Characterization of Bi12GeO20Prepared by Modified Pechini Method

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
C. G. P. Moraes ◽  
F. A. A. Jesus ◽  
Z. S. Macedo
Keyword(s):  
Volume Fraction ◽  
Pechini Method ◽  
Dark Conductivity ◽  
High Frequencies ◽  
Dielectric Characterization ◽  
Calcination Temperatures ◽  
Grain Sizes ◽  
Synthesis Parameters ◽  
Modified Pechini Method

Bismuth germanate (Bi12GeO20) ceramics were produced using modified Pechini route, and the synthesis parameters, crystalline phases, microstructure, and sintering conditions were investigated.Bi12GeO20powders with submicrometric particle sizes were investigated for calcination temperatures from 400 to 600°C, with soaking times of 1 h and 5 h. Controlling the synthesis parameters, dense ceramics with two different grain sizes of 3.4 ± 0.5 µm and 5.7 ± 0.8 µm could be produced after sintering at 750°C/1 h. The electric and dielectric properties of these ceramics were determined by impedance spectroscopy (IS). From the results, it was concluded that the dielectric permittivity measured at high frequencies is insensitive to the grain size, while the AC dark conductivity presents a noticeable dependency on this feature. This behaviour was discussed on the basis of a Maxwell-Wagner interfacial relaxation, whose intensity depends directly on the volume fraction of grain boundaries in the sample.

Multiferroic properties of Bi0.5K0.5TiO3–BiFe1−xCoxO3 (0 ≤ x ≤ 0.2) solid solution

RSC Advances ◽  
2015 ◽  
Vol 5 (126) ◽  
pp. 104210-104215 ◽  
Author(s):  
X. Z. Zuo ◽  
J. Yang ◽  
B. Yuan ◽  
X. C. Kan ◽  
Lin Zu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Pechini Method ◽  
Ferroelectric Properties ◽  
Lead Free ◽  
Multiferroic Properties ◽  
Modified Pechini Method

We have successfully prepared a binary lead-free solid-solution of Bi0.5K0.5TiO3–BiFe1−xCoxO3 using a modified Pechini method and investigated the magnetic and ferroelectric properties of Bi0.5K0.5TiO3–BiFe1−xCoxO3 (0 ≤ x ≤ 0.2).

Structural and photocatalytic properties of Mg2SnO4 spinel obtained by modified Pechini method

2019 ◽  
Vol 236 ◽  
pp. 320-323 ◽  
Author(s):  
J.M. Costa ◽  
L.C. Lima ◽  
M.S. Li ◽  
I.M.G. Santos ◽  
M.R.S. Silva ◽  
...  
Keyword(s):  
Pechini Method ◽  
Photocatalytic Properties ◽  
Modified Pechini Method

Synthesis and Study of Nanocrystalline Mg2SiO4 Powder and Yttrium Aluminum Garnet

2019 ◽  
Vol 822 ◽  
pp. 334-342
Author(s):  
Aleksander Semencha ◽  
Elena V. Bochagina ◽  
Margarita G. Dronova
Keyword(s):  
Yttrium Aluminum Garnet ◽  
Pechini Method ◽  
Average Pore Size ◽  
Magnesium Silicate ◽  
Nanocrystalline Powders ◽  
Inorganic Salts ◽  
Average Pore ◽  
Synthesis Parameters ◽  
Modified Pechini Method ◽  
Yttrium Aluminum

The work investigates the characteristics of the porosity of inorganic salts: magnesium silicate and yttrium aluminum garnet (YAG). Using the example of nanocrystalline powders of magnesium silicate and yttrium aluminum garnet, the effect of synthesis parameters on the phase composition and porous characteristics of the obtained powders was studied. The average pore size of adsorbents was obtained: magnesium silicate - 48 nm; YAG, obtained by the standard Pechini method – 44 nm; YAG, obtained by the modified Pechini method – 37 nm; the industrial brand “magnesol” – 32 nm. The resulting materials can be attributed to mesoporous adsorbents.

scholarly journals An A- and B-Site Substitutional Study of SrFeO3−δ Perovskites for Solar Thermochemical Air Separation

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5123
Author(s):  
Tyler P. Farr ◽  
Nhu Pailes Nguyen ◽  
H. Evan Bush ◽  
Andrea Ambrosini ◽  
Peter G. Loutzenhiser
Keyword(s):  
Pechini Method ◽  
Thermal Reduction ◽  
Air Separation ◽  
Solar Irradiation ◽  
X Ray ◽  
Modified Pechini Method ◽  
Solar Thermochemical ◽  
Pressure Swing ◽  
A Site

An A‑ and B‑site substitutional study of SrFeO3−δ perovskites (A’xA1−xB’yB1−yO3−δ, where A = Sr and B = Fe) was performed for a two‑step solar thermochemical air separation cycle. The cycle steps encompass (1) the thermal reduction of A’xSr1−xB’yFe1−yO3−δ driven by concentrated solar irradiation and (2) the oxidation of A’xSr1−xB’yFe1−yO3−δ in air to remove O2, leaving N2. The oxidized A’xSr1−xB’yFe1−yO3−δ is recycled back to the first step to complete the cycle, resulting in the separation of N2 from air and concentrated solar irradiation. A-site substitution fractions between 0 ≤ x ≤ 0.2 were examined for A’ = Ba, Ca, and La. B-site substitution fractions between 0 ≤ y ≤ 0.2 were examined for B’ = Cr, Cu, Co, and Mn. Samples were prepared with a modified Pechini method and characterized with X-ray diffractometry. The mass changes and deviations from stoichiometry were evaluated with thermogravimetry in three screenings with temperature- and O2 pressure-swings between 573 and 1473 K and 20% O2/Ar and 100% Ar at 1 bar, respectively. A’ = Ba or La and B’ = Co resulted in the most improved redox capacities amongst temperature- and O2 pressure-swing experiments.

Preparation of KNbO3 Powder by Modified Pechini Method from Layered Perovskite Aqueous Solution

2008 ◽  
Vol 368-372 ◽  
pp. 1883-1885 ◽  
Author(s):  
Takafumi Kokubo ◽  
Kenichi Kakimoto ◽  
Hitoshi Ohsato
Keyword(s):  
Crystal Structure ◽  
Pechini Method ◽  
Layered Perovskite ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
Thermal Decomposition Behavior ◽  
Modified Pechini Method ◽  
Ft Ir ◽  
Decomposition Behavior

KNbO3 (KN) powder was synthesized by modified Pechini method (polymeric precursor method). KN powder with different crystal structure and grain size distribution was synthesized by different drying temperature. In this paper, the mechanism of preparation of KN powder was discussed in thermal decomposition behavior. The obtained powder was characterized by XRD, TEM, FT-IR and TG-DTA.

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