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1.
The synthesis of new compounds based on Bi 2O 3 is investigated because they can be used as new colour inorganic pigments. Chemical compounds of the Bi 2-xY x/2Zr 3x/ 8O 3 type were synthetised. The host lattice of these pigments is Bi 2O 3 that is doped by Y 3+ and Zr 4+ ions. The incorporation of doped ions provides interesting colours and contributes to a growth of the thermal stability of
these compounds. The simultaneous TG-DTA measurements were used for determination of the temperature region of the pigment
formation and thermal stability of pigments. This paper also contains the results of the pigment characterization by X-ray
powder diffraction and their colour properties. 相似文献
2.
The synthesis of new pigments based on Bi 2O 3
is investigated because they give interesting orange hues and can substitute
the pigments problematic from the environmental point of view. Chemical compounds
of the Bi 2–xZr 3x/4O 3
type were synthesized. The host lattice of these pigments is Bi 2O 3
that is doped by Zr 4+ ions. The area of ZrO 2
solubility in Bi 2O 3 at 800°C
forming solid solution of both oxides was studied. The incorporation of doped
ions provides interesting colours and contributes to a growth of the thermal
stability of these compounds. The simultaneous TG-DTA measurements were used
for determination of the temperature region of the pigment formation and thermal
stability of pigments. 相似文献
3.
The synthesis of new compounds based on Bi 2O 3
is investigated because they can be used as new environmentally friendly inorganic
pigments. Chemical compounds of the (Bi 2O 3) 1–x(Er 2O 3) x type were synthetized.
The host lattice of these pigments is Bi2O3 that is doped by Er 3+
ions. The incorporation of doped ions provides interesting colours and contributes
to an increase in the thermal stability of these compounds. The simultaneous
TG-DTA measurements were used for determination of the temperature region
of the pigment formation and thermal stability of pigments. 相似文献
4.
The synthesis of new compounds based on Bi 2O 3 is investigated because they can be used as new ecological inorganic pigments. Chemical compounds of the (Bi 2O 3) 1−x(Y 2O 3) x type were synthesized. The host lattice of these pigments is Bi 2O 3 that is doped by Y 3+ ions. The incorporation of doped ions provides the interesting colours and contributes to a growth of the thermal stability
of these compounds. The simultaneous TG-DTA measurements were used for determination of the temperature region of the pigment
formation and thermal stability of pigments. This paper also contains the results of the pigment characterization by X-ray
powder diffraction and their colour properties. 相似文献
5.
New environmentally inorganic pigments based on Bi 2O 3 doped by metal ions, such as Zr 4+ and Dy 3+ have been developed and characterized using the methods thermal analysis, X-ray powder diffraction, and spectral reflectance
data. The compounds having formula Bi 2−x
Dy
x/2Zr 3x/8O 3 ( x = 0.2, 0.6, 1.0, and 1.2) were prepared by the solid state reaction. Methods of thermal analysis were used for determination
of the temperature region of the pigment formation and thermal stability of compounds. The incorporation of doped ions in
Bi 2O 3 changes the color from yellow to orange and also contributes to a growth of their thermal stability. This property gives
a direction for coloring ceramic glazes. 相似文献
6.
A series of novel environmentally inorganic pigments based on Bi 2O 3 doped by metal ion Dy 3+ has been developed and characterized using methods of thermal analysis, X-ray powder diffraction and by reflectance spectral data. The new pigments have been synthesized from mixtures containing Bi 2O 3 and Dy 2O 3 by traditional solid-state route. The incorporation of Dy 3+ into crystal lattice Bi 2O 3 changes the colour from yellow-orange to orange. The band gap of phases with formula Bi 2?xDy xO 3, where x = 0.8, increases from 2.30 to 2.38 eV with growth of calcination temperature. The pigment Bi 1.2Dy 0.8O 3 was also evaluated from the standpoint of influence of milling time on the colour properties and particle size. The simultaneous TG–DTA measurements were used for determination of the temperature region of the pigment formation and thermal stability of pigments. The results confirm the positive effect of lanthanide ions into Bi 2O 3 on thermal stability of prepared phases. 相似文献
7.
A series of novel environmentally inorganic pigments based on Bi 2O 3 doped by rare-earth elements RE (Er, Ho, La, Nd, Dy, Lu and Y) have been developed and characterized using methods of thermal analysis, X-ray powder diffraction and by reflectance spectral data. The new pigments have been synthesized from mixtures containing Bi 2O 3 and RE 2O 3 by traditional solid-state route. The incorporation of RE 3+ into crystal lattice Bi 2O 3 changes the colour from yellow, yellow-orange to orange. The simultaneous TG?CDTA measurements were used for determination of the temperature region of the pigment formation and thermal stability of pigments. The results confirm the positive effect of rare-earth ions doped into Bi 2O 3 that contribute to a growth of thermal stability of prepared pigments. 相似文献
8.
The synthesis of new compounds based on the Bi 2O 3–Ho 2O 3 system, which can be used as new ecological inorganic
pigments, is investigated in our laboratory. The optimum conditions for the
syntheses of these compounds have been followed by the methods of thermal
analysis that can provide first information about the temperature region of
the pigment formation. The synthesis of these compounds was followed by thermal
analysis using STA 449/C Jupiter (Netzsch, Germany). 相似文献
9.
New inorganic compounds having the general formula (Bi 2O 3) 1−x
(Lu 2O 3)
x
( x ranges from 0.1 to 0.5) displaying orange colours have been synthesized by traditional solid-state route, as viable alternatives
to lead, cadmium and chromium based yellow toxic inorganic pigments. The host lattice of these pigments is Bi 2O 3 that is doped by Lu 3+ ions. The goal was to develop conditions for the synthesis of these compounds and to determine the influence of calcination
temperature and lutetium content on their colouring effects. The simultaneous TG-DTA measurements were used for determination
of the temperature region of the pigment formation and thermal stability of pigments. The pigments were also evaluated from
the standpoint of their structure and particle sizes. 相似文献
10.
Bi 3+ and lanthanide ions have been codoped in metal oxides as optical sensitizers and emitters. But such codoping is not known in typical semiconductors such as Si, GaAs, and CdSe. Metal halide perovskite with coordination number 6 provides an opportunity to codope Bi 3+ and lanthanide ions. Codoping of Bi 3+ and Ln 3+ (Ln=Er and Yb) in Cs 2AgInCl 6 double perovskite is presented. Bi 3+‐Er 3+ codoped Cs 2AgInCl 6 shows Er 3+ f‐electron emission at 1540 nm (suitable for low‐loss optical communication). Bi 3+ codoping decreases the excitation (absorption) energy, such that the samples can be excited with ca. 370 nm light. At that excitation, Bi 3+‐Er 3+ codoped Cs 2AgInCl 6 shows ca. 45 times higher emission intensity compared to the Er 3+ doped Cs 2AgInCl 6. Similar results are also observed in Bi 3+‐Yb 3+ codoped sample emitting at 994 nm. A combination of temperature‐dependent (5.7 K to 423 K) photoluminescence and calculations is used to understand the optical sensitization and emission processes. 相似文献
11.
The influence of conditions of the preliminary thermal treatment of ZrO 2, ammonia and methanol adsorption, and MoO 3 supporting on O 2
– formation during the adsorption of an NO + O 2 mixture was studied. The interaction of O 2
– with different molecules was studied. Adsorbed ammonia and methanol, as well as supported Mo 6+ ions, were shown to inhibit this reaction. The involvement of the Zr 4+ and O 2– Lewis sites in the reaction was concluded. The interaction of ammonia and methanol with the O 2
– radical anions changed the g tensor parameters and decreased the thermal stability of O 2
– in the case of methanol. O 2
– radical anions were formed on the reduced (0.1–2.0)% MoO 3/ZrO 2 samples during the interaction of O 2 with the Mo 5+ ions in the octahedral configuration. As in the case of O 2
– formation during NO + O 2 adsorption on ZrO 2, the radical anions were localized in the coordination spheres of the coordinately unsaturated Zr 4+ ions. A change in the MoO 3 content of the samples from 0.1 to 0.5% led to an increase in the amount of O 2
–, whereas a change from 0.5 to 2.0% led to a decrease in the O 2
– amount due to the screening of the Zr 4+ ions by oxo complexes and polymolybdates. 相似文献
12.
Bi 3+ and lanthanide ions have been codoped in metal oxides as optical sensitizers and emitters. But such codoping is not known in typical semiconductors such as Si, GaAs, and CdSe. Metal halide perovskite with coordination number 6 provides an opportunity to codope Bi 3+ and lanthanide ions. Codoping of Bi 3+ and Ln 3+ (Ln=Er and Yb) in Cs 2AgInCl 6 double perovskite is presented. Bi 3+-Er 3+ codoped Cs 2AgInCl 6 shows Er 3+ f-electron emission at 1540 nm (suitable for low-loss optical communication). Bi 3+ codoping decreases the excitation (absorption) energy, such that the samples can be excited with ca. 370 nm light. At that excitation, Bi 3+-Er 3+ codoped Cs 2AgInCl 6 shows ca. 45 times higher emission intensity compared to the Er 3+ doped Cs 2AgInCl 6. Similar results are also observed in Bi 3+-Yb 3+ codoped sample emitting at 994 nm. A combination of temperature-dependent (5.7 K to 423 K) photoluminescence and calculations is used to understand the optical sensitization and emission processes. 相似文献
13.
The synthesis of new compounds based on CeO 2-PrO 2-La 2O 3, which can be used as pigments for colouring of ceramic glazes, is investigated in our laboratory. The optimum conditions
for the syntheses of these compounds have been estimated. The first information about the temperature region of the formation
of the pigments investigated is provided by thermal analysis. The synthesis of these compounds is followed by thermal analysis
using STA 449/C Jupiter (Netzsch, Germany).
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
14.
Er 2O 3-SiO 2 xerogels doped with different Er/Si concentrations were annealed at 950°C for 120 h. The Er 3+ doping level varied from 0 to 40000 Er/Si ppm. The effect of Er 2O 3 content on the sintering behavior of silica gels and on the luminescence properties was studied by Vis-NIR absorption, Raman and luminescence spectroscopies. 相似文献
15.
Light brown inorganic pigments based on BiFeO3 doped by Sr2+ cations were prepared by a conventional solid-state reaction at high temperature. This study is focused on the synthesis of Bi1?x
Sr
x
FeO3?δ
powders in a range of substitution (x = 0–0.35; with step size 0.05). The main role of strontium is to overcome the defects that come to exist during the evaporation of Bi over material preparation. The substitution of trivalent bismuth ions by divalent strontium ions results in oxygen deficiency in the lattice, which was proved by both thermogravimetric analysis and elemental analysis. The substitution has a positive effect on the thermal stability of samples. The thermal stability of BiFeO3 is 1046 K, whereas the substitution of 20 mol% of Bi3+ by Sr2+ ions shifted it to 1403 K and powder with composition Bi0.65Sr0.35FeO3?δ
has a thermal stability that is higher than 1434 K. An increasing range of substitution is connected with the change in the pigment color from reddish-brown to orange-brown and back to reddish-brown. The Bi0.85Sr0.15FeO3?δ
pigment prepared by calcination at 1273 K offers the most interesting color properties (L* = 45.57; a* = 20.38; b* = 26.23). 相似文献
16.
Spindle-shaped α-FeOOH particles were synthesized using the chemical coprecipitation method in Fe(CO 3) x(OH) 2(?x) suspensions system by adding metallic ions. The spindle-shaped γ-Fe 2O 3 particles were obtained by dehydration of α-FeOOH, and subsequent reduction and oxidation. Its thermal stability was investigated by differential thermal analysis (DTA). It was found that the transition temperature of γ-Fe 2O 3→α-Fe 2O 3 of samples doped with metallic ions is higher than that of the pure γ-Fe 2O 3 and increasing with increase of the size of the metallic ions, and γ-Fe 2O 3 by doping with two or more different metallic ions together has even higher thermal stability. The origin of the improved thermal stability was discussed. Additionally, the magnetic properties of γ-Fe 2O 3 were measured. 相似文献
17.
In this paper, x (=2, 5, 7 and 10mol%) Co 2+-doped Fe 2O 3 (xCo:Fe 2O 3) nanoparticles with enhanced photocatalytic activity have been reported. xCo:Fe 2O 3 nanoparticles were successfully prepared by co-precipitation followed thermal decomposition method. The structural, optical and morphological properties of the prepared samples were studied by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), diffuse reflectance (DR) UV–visible absorption spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The obtained results revealed that Co 2+ ions were well doped within the lattices of Fe 2O 3. Also, Co 2+ ions suppress the formation of the most stable α- Fe 2O 3 and stabilize less stable γ-Fe 2O 3 at 450 °C. The photocatalytic activity of xCo:Fe 2O 3 was examined by using pararosaniline (PR) dye. It was found that photocatalytic degradation of PR depends on dopant concentration (Co 2+ ions). Relatively, the highest photocatalytic activity was observed for 5%Co:Fe 2O 3 nanoparticles. The plausible photocatalytic degradation pathway of PR at xCo:Fe 2O 3 surface has also been proposed. 相似文献
18.
Currently, with increasing demand for non-contact fluorescence intensity ratio-based optical thermometry, a novel phosphor with high-efficiency, dual-emitting centers, and differentiable temperature sensitivity is more and more urgent to develop. In this work, an efficient dual-emitting center optical thermometry with high sensitivity and multicolor tunable in Ca 2Sb 2O 7:Bi 3+, Eu 3+ phosphor is firstly designed and successfully prepared. Under 330 nm excitation, the fabricated phosphor presents the featured and distinguishable emissions of Bi 3+ and Eu 3+ ions. The high efficiency energy transfer from Bi 3+ to Eu 3+ ions is proved and its corresponding mechanism belongs to dipole-dipole interaction. By modulating the ratio of Bi 3+/Eu 3+, the multicolor changes from blue to pink are realized. Based on the discriminative thermal quenching behavior between Bi 3+ and Eu 3+, the fluorescence intensity ratio of Eu 3+ to Bi 3+ in Ca 2Sb 2O 7 samples illustrates excellent optical thermometry performance from 298 to 523 K. The maximum absolute sensitivity ( Sa) and relative sensitivity ( Sr) reach as high as 0.2773 K ?1 at 523 K and 2.37% K ?1 at 448 K, respectively. Notably, the discriminated surrounding temperature can be directly confirmed by observing the emitting color from purple to orange-red with the temperature increase from 298 to 523 K. Furthermore, the as-prepared phosphor materials also demonstrate outstanding repeatability and excellent reversibility. These results exhibit that the designed Ca 2Sb 2O 7:Bi 3+, Eu 3+ phosphors have great promising applications in the field of non-contact optical temperature thermometry and thermochromic. 相似文献
19.
High color purity red emission with single band successfully achieved in a new Er 3+, Tm 3+ co-doped Y 2Ti 2O 7 system under 1550 nm excitation, value of red to green emission ratio of the samples is more than 10 3. Efficient up-conversion luminescence can be obtained while the 4I 13/2 level of Er 3+ pumped by 1500 nm directly based on the large absorption section and long luminescence lifetime, and red emission composition will greatly enhanced by co-doping with Tm 3+ ions, color purity of red emission under 1550 nm excitation is much higher than that of 980 nm. The quenching concentration of Er 3+ ions is up to 28 mol% in Y 2Ti 2O 7 rely on the layer distribution of cations, which can further improve the red emission color purity. 相似文献
20.
Synthesis of the green
spinel pigment Co 0.46Zn 0.55(Ti 0.064Cr 0.91) 2O 4 by a novel two-step method of preparation have
been investigated. Inorganic pigments are almost always prepared by a solid
state reaction. It is classical ceramic method which used oxides, hydroxides
or carbonates as precursors. The reaction is performed at temperature higher
than 1300°C and an agent of mineralization is usually present. The presented
novel method of preparation decreases the calcining temperature necessary
for reaching of bright and clear hue of the pigments prepared. Main attention
was focused on the influence of two types of titanium raw materials on the
temperature region of the spinel structure formation and on the colour properties
of the pigments. The mixture of precursors with TiO 2
gives a one-phase system when calcining at 1100°C but the colour properties
are more interesting at 1150°C. Thermal stability of this pigment is limited
by temperature 1300°C. This temperature is connected with partial oxidation
of Cr(III) to Cr(VI). Thermal analysis provided the first information about
the temperature region of the pigment formation and determined the thermal
stability of pigment. 相似文献
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