CN111039323A

CN111039323A - Bi doped with iron/terbium element3YO6Inorganic pigment and preparation method and application thereof

Info

Publication number: CN111039323A
Application number: CN201911225352.6A
Authority: CN
Inventors: 孙晓琦; 谢文琦; 黄彬; 肖瑜
Original assignee: Xiamen Institute of Rare Earth Materials
Current assignee: Xiamen Institute of Rare Earth Materials
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-04-21
Anticipated expiration: 2039-12-04
Also published as: CN111039323B

Abstract

The invention relates to the technical field of pigments, and discloses Bi doped with iron/terbium element₃YO₆An inorganic pigment having the formula: bi_3‑ _xFe_xYO₆Or Bi₃Y_1‑xTb_xO_6+δThe invention provides a series of doped Fe₂O₃Or Tb₄O₇Of Bi₃YO₆Inorganic, non-toxic, high near infrared reflective pigments even at L^*In the deep orange and deep red with lower values, the near infrared reflectivity of the deep orange and the deep red is still higher than that of the common pigment, and the practical application shows that the near infrared reflectivity and the color forming capability of the novel pigment have very high application prospect.

Description

Bi doped with iron/terbium element3YO6Inorganic pigment and preparation method and application thereof

Technical Field

The invention relates to the technical field of pigments, in particular to Bi doped with iron/terbium element₃YO₆Inorganic pigment and its preparation method and application.

Background

The continuous consumption of global petroleum energy and the continuous rise of energy cost promote the development of new technology for improving the global energy utilization rate, and one of the technology is to use special near-infrared reflection pigments. The solar spectrum is a continuous spectrum composed of different wavelengths, and is divided into visible light and invisible light. The invisible light is divided into two types: infrared rays outside the red region and ultraviolet rays outside the violet region. In the total solar radiation, the visible region accounts for about 50% of the total radiant energy, the infrared region accounts for about 43%, and the ultraviolet region accounts for about 7% of the total radiant energy. Therefore, infrared rays have a great thermal effect. The main function of the near infrared reflection pigment is to reflect near infrared wave band invisible to human but having considerable heat radiation, thereby reducing heat accumulated when buildings, storage tanks and the like are subjected to solar radiation.

Compared with organic pigments, inorganic pigments have great advantages in terms of chemical resistance, hiding power, weather resistance and the like. Inorganic pigments with high near infrared reflectance have great potential in mitigating the global energy crisis. To date, there are still a considerable number of inorganic pigments containing heavy metal elements such as cadmium, cobalt, chromium, mercury, lead, antimony, selenium, which are harmful to human health and the environment. In recent years, rare earth-based near-infrared reflective pigments have been considered as effective substitutes for conventional toxic inorganic pigments due to their low toxicity, high near-infrared reflectance, and color diversity.

So far, no report has been made about the use of bismuth and yttrium mixed oxides in near-infrared reflective pigments.

Disclosure of Invention

The invention aims to provide Bi doped with iron/terbium element₃YO₆Inorganic pigment, preparation method and application thereof, in order to provide inorganic pigment with higher infrared reflectivity.

In order to achieve the technical purpose and achieve the technical effect, the invention discloses Bi doped with iron element₃YO₆An inorganic pigment having the following general structural formula: bi_3-xFe_xYO₆Wherein the element Fe is Fe (III).

Further, the value range of X is: x is more than or equal to 0.05 and less than or equal to 0.8.

Further, the inorganic pigment has a disordered fluorite structure of Fm-3m space group.

Bi doped with terbium element₃YO₆An inorganic pigment having the following general structural formula: bi₃Y_1-xTb_xO_6+δWherein the element Tb is Tb (III, IV), namely Tb is the mixed valence of positive three valence and positive four valence.

Further, the value range of X is: x is more than or equal to 0.01 and less than or equal to 0.1.

Bi as defined above₃YO₆The preparation method of the inorganic pigment is characterized by comprising the following steps:

(1) weighing raw materials according to the weight, wherein the raw materials comprise Bi₂O₃、Y₂O₃And an oxide requiring a doping element, the oxide of the doping element being Fe₂O₃Or Tb₄O₇；

(2) Mixing the weighed raw materials with acetone in an agate mortar, grinding, and completely volatilizing the acetone to obtain mixed powder;

(3) drying the mixed powder, and calcining the dried mixed powder;

(4) and (4) after the reaction in the step (3) is finished, naturally cooling to room temperature to obtain a pigment product.

Further, the calcination process comprises the following steps: the reaction was first carried out at 800 ℃ for 90 minutes and then heated to 900 ℃ for 120 minutes.

The above-mentioned Bi₃YO₆Use of an inorganic pigment for exterior painting of buildings or oil and gas storage tanks.

The invention has the following beneficial effects:

(1) provides a series of doped Fe₂O₃Or Tb₄O₇Of Bi₃YO₆A non-toxic near infrared reflective pigment. Even in thatL^*In the deep orange and deep red with lower values, the near infrared reflectivity of the deep orange and the deep red is still higher than that of the common pigment, and the practical application shows that the near infrared reflectivity and the color forming capability of the novel pigment have very high application prospect.

(2) High-temperature calcination method is adopted to synthesize Bi doped with Fe (III) and Tb (III, IV)₃YO₆An inorganic pigment. The calcined pigment has low strength and is in a relatively loose state. All pigments have a disordered fluorite structure.

(3) The pigment has the advantages of near infrared reflection and heat insulation, can be used as a 'cool pigment' on a building roof, has chemical stability in an acid-base test, is simple in preparation process and convenient for mass production, and is expected to be competitive in nontoxic and environment-friendly pigments.

Drawings

FIG. 1 shows Bi of the present invention_3-xFe_xYO₆Powder X-ray diffraction pattern of the pigment.

FIG. 2 shows Bi of the present invention₃Y_1-xTb_xO_6+δPowder X-ray diffraction pattern of the pigment.

FIG. 3 shows Bi of the present invention_3-xFe_xYO₆The optical properties of the pigment.

FIG. 4 shows Bi of the present invention₃Y_1-xTb_xO_6+δThe optical properties of the pigment.

FIG. 5 shows three typical pigments Bi according to the invention_3-xF_xYO₆(x＝0.4)、Bi₃YO₆And Bi₃Y_1-xTb_xO_6+δ(x ═ 0.05) and iron oxide yellow pigment are shown in the galvanized sheet after coating.

FIG. 6 shows three typical pigments Bi according to the invention_3-xF_xYO₆(x＝0.4)、Bi₃YO₆And Bi₃Y_1-xTb_xO_6+δ(x ═ 0.05) and yellow iron oxide pigments were coated on the galvanized plates respectively in the form of thermal images under irradiation of infrared lamps.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention discloses Bi doped with iron element₃YO₆An inorganic pigment having the following general structural formula: bi_3- _xFe_xYO₆Wherein the element Fe is Fe (III).

Bi doped with terbium element₃YO₆An inorganic pigment having the following general structural formula: bi₃Y_1-xTb_xO_6+δWherein the element Tb is Tb (III, IV).

(3) drying the mixed powder, and calcining the dried mixed powder;

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications can be made by those skilled in the art after reading the description of the present invention, and such equivalents also fall within the scope of the invention.

1. Composite materials and methods

Bi₂O₃、Y₂O₃、Fe₂O₃、Tb₄O₇Chemical reagent is of analytical grade (purity)>99.9%) from Aladdin reagent (Shanghai) Inc., available from Shigaku corporation, acetone, nitric acid, sulfuric acid, and sodium hydroxide. The starting material was not further purified.

The method for synthesizing the pigment powder by adopting a high-temperature calcination method is an experimental method widely adopted in factories and laboratories.

Bi_3-xFe_xYO₆(x＝0，0.05，0.1，0.15，0.2，0.25，0.3，0.4，0.6，0.8)；

Bi₃Y_1-xTb_xO_6+δ(x＝0.01，0.02，0.03，0.04，0.05，0.1，0.2，0.3，0.4，0.5)。

Preparation process

(1) Weighing raw materials according to the weight, wherein the raw materials comprise Bi₂O₃、Y₂O₃And an oxide requiring a doping element, the oxide of the doping element being Fe₂O₃Or Tb₄O₇(ii) a (2) Mixing the weighed raw materials with acetone in an agate mortar, grinding, and completely volatilizing the acetone to obtain mixed powder;

(3) drying the mixed powder, and calcining the dried mixed powder;

(4) after the reaction in the step (3) is finished, naturally cooling to room temperature to obtain a pigment product

The raw materials weighed according to the stoichiometric ratio are mixed with acetone in an agate mortar for grinding, after the acetone is completely volatilized, mixed powder is obtained, the uniform mixed powder is completely dried in a drying box, the uniformly mixed powder is placed in a corundum crucible for reaction for 90 minutes in a muffle furnace at 800 ℃, and then the mixture is further heated to 900 ℃ for reaction for 120 minutes. After the reaction is finished, naturally cooling to room temperature and taking out. The resulting pigment was again ground in an agate mortar with an appropriate amount of acetone, and finally, a pigment sample was prepared.

2. X-ray diffraction analysis of samples

FIGS. 1-2 show Bi synthesized by the above-described method_3-xFe_xYO₆And Bi₃Y_1-xTb_xO_6+δThe X-ray diffraction pattern of the pigment powder showed that both of the doped products had a characteristic peak of disordered fluorite structure with a space group of Fm-3m, and the XRD data were in accordance with the standard pattern (PDF NO.33-0223) according to the standard peak pattern (Bi)_1.5Y_0.5O₃) And the XRD pattern of the sample shows that the diffraction peak is not Bi₂O₃Or Y₂O₃The peaks, sharp and high intensity peaks indicate that the sample has high crystallinity under the predetermined calcination conditions. When Fe (III) is doped with Bi₃YO₆When the doping amount of (B) is more than 0.25, Bi₂FeO₉The characteristic peaks of (A) appear at 32.977 DEG and 33.847 DEG, indicating that Fe (III) is doped excessively and excessive Fe₂O₃And Bi₂O₃A new solid solution phase is formed. From Bi₃Y_1-xTb_xO_6+δNo other phases are observed, and Tb (III, IV) is completely incorporated into Bi₃YO₆Lattice formation of Bi₃Y_1-xTb_xO_6+δSolid solution. The diffraction peaks shifted slightly with increasing fe (III) and Tb (III, IV) doping concentrations. This is because the doping amounts of Fe (III) and Tb (III, IV) make the unit cell volume larger, compress the crystal lattice, and increase the strain.

3.Bi_3-xFe_xYO₆Optical properties of

Bi_3-xFe_xYO₆The diffuse reflectance spectrum of the pigment in the ultraviolet-visible region is shown in FIG. 3(a), and the corresponding absorption spectrum is shown in FIG. 3 (b). To observe the introduction of a new band associated with the dopant, the spectrum x of the undoped sample is also added to the figure as 0. As can be seen from the diffuse reflection spectrum shown in fig. 3(a), the doping of fe (iii) has a great influence on the reflectance of the sample in the visible region. The doping of Fe (III) causes the sample to have strong absorption near 600nm, so that the pigment changes from yellow to red. The doping of fe (iii) also increases the absorption limit of the material, which necessarily results in a decrease of the forbidden band width of the material. The effect of doping with fe (iii) on the sample and Eg colour properties is summarized in table 1. After fe (iii) doping, the Eg in the sample, except for x ═ 0.8, is not in the near infrared radiant energy range (0.5eV-1.8eV), indicating that the pigment has good near infrared reflectance properties.

The ultraviolet-visible near infrared diffuse reflection spectrum and the ultraviolet-visible absorption spectrum of the sample are measured by an Agilent Cary 5000 ultraviolet-visible-near infrared spectrophotometer. The near infrared solar reflectance of the pigment was calculated by the following formula:

wherein r (λ), i (λ) and d λ represent the reflectance of the sample at the wavelength λ, the standard radiation intensity and the wavelength interval, respectively, and the integration range is in the near infrared band.

The band gap (Eg) of the pigment sample can be estimated from the reflectance of the powder sample in the range of 300-700 nm. First, the absorption limit of the sample was calculated using the Kubulka-Munk equation, which is expressed as follows:

"R" is the reflectance of the sample in the visible region. The values are plotted against wavelength, and the intersection of the tangent and the horizontal axis is the absorption limit of the sample. The absorption limit was then substituted into the formula to obtain the Eg value for the powder sample.

The absorption limit was substituted into the following formula to obtain the Eg of the powder sample.

Color rendering property of synthetic pigment measured by CS-580A type chromatograph, and CIEL^*a^*b^*The value represents the chromaticity of the pigment. L is^*The values represent the brightness of the pigment. The values range from black (0) to white (100). The larger the value, the brighter the pigment; a is^*And b^*The values represent pigments. Except for L^*a^*b^*Outside the values, the parameter C is usually used^*And H ° is used to indicate the color saturation and hue angle values of the pigment, the H ° ranging from 0 ° to 360 °. C^*And H ° are calculated as follows:

TABLE 1 Effect of Fe (III) doping on sample color characteristics and Eg

x	L^*	a^*	b^*	C^*	H°	Eg(eV)
							0	78.12	14.01	56.83	58.53	76.15	2.775
0.05	74.87	12.97	54.33	55.86	76.57	2.700
							0.1	70.46	14.80	51.57	53.65	73.98	2.617
0.15	68.93	15.11	49.38	51.64	72.98	2.525
							0.2	65.79	16.55	46.34	49.21	70.35	2.408
0.25	63.45	17.57	43.77	47.16	68.13	2.318
							0.3	63.20	17.50	41.97	45.47	67.37	2.196
0.4	57.55	19.62	39.02	43.67	63.31	2.084
							0.6	54.33	20.07	33.20	38.79	58.85	1.811
0.8	49.91	20.14	27.80	34.33	54.08	1.697

As can be seen from Table 1, as the amount of Fe (III) doping is increased, the pigment L^*The value decreases from 78.12(x ═ 0) to 49.91(x ═ 0.8), which means that the brightness of the pigment becomes lower and the color becomes darker. a is^*The value increased from 14.01(x ═ 0) to 20.14(x ═ 0.8), indicating a gradual increase in the red color of the pigment. In addition, b^*The value decreased from 56.83(x ═ 0) to 27.80(x ═ 0.8), indicating a gradual decrease in the yellow color of the pigment. On the other hand, C^*The values varied widely (from 58.53 to 34.33, by 24.2). The doping with fe (iii) can significantly improve the color saturation of the pigment. Thus, fe (iii) doping can turn the pigment from light yellow, soft orange, orange to dark red.

Bi_3-xFe_xYO₆The near infrared reflectance spectrum of the pigment is shown in FIG. 3 (c). Bi powder measured according to ASTM Standard G173-03_3-xFe_xYO₆The solar reflectance spectrum of the pigment is shown in fig. 3 (d). From the reflection spectrum, it can be seen that the parent pigment Bi₃YO₆The near infrared reflectance of (2) is highest. With the increase of the doping amount of Fe (III), the near infrared reflectivity is reduced from 99.5829% to 53.8661% (x is 0.8). Although the incorporation of fe (iii) reduces the reflectance of the pigment, the incorporation of fe (iii) changes the color of the pigment from yellow to orange-red, which in turn changes to deep red, helping to meet the public demand for color. Compared with the common yellow pigment, the pigment has higher near infrared reflectivity. The near infrared reflectance and near infrared solar reflectance of the doped pigments are shown in table 5. Pigment Bi as a near-infrared solar radiation reflectance₃YO₆Has a maximum near infrared reflectance of 92.2888%, which means that the pigment is capable of reflecting most of the near infrared solar energy. The parent pigment has the potential to prepare pigments with high near-infrared reflectivity.

4.Bi₃Y_1-xTb_xO_6+δOptical properties of

Bi₃Y_1-xTb_xO_6+δThe diffuse reflection spectrum of the pigment in the ultraviolet visible region is shown in fig. 4(a), the corresponding absorption spectrum is shown in fig. 4(b), and it can be seen from the diffuse reflection spectrum shown in fig. 4(a) that the incorporation of Tb (III, IV) has a certain effect on the reflectivity of the sample in the visible region, and does not cause the distortion of the diffuse reflection spectrum as the Fe (III) is doped. Doping of Tb (III, IV) changes the color of the pigment from yellow to dark yellow. Likewise, doping of Tb (III, IV) also results in an increase in the absorption limit of the material and a decrease in Eg. Table 2 summarizes the effect of doping Tb (III, IV) on the color properties and Eg of the samples.

Table 2 summarizes the effect of doping Tb (III, IV) on the color properties and Eg of the samples

x	L^*	a^*	b^*	C^*	H°	Eg(eV)
							0.01	77.75	13.86	56.97	58.63	76.32	2.726
0.02	78.12	13.29	56.15	57.70	76.68	2.684
							0.03	77.47	13.60	56.18	57.80	76.39	2.663
0.04	77.08	14.18	56.88	58.62	76.00	2.561
							0.05	77.73	13.28	55.52	57.09	76.54	2.455
0.1	75.11	15.00	56.08	58.05	75.03	2.315
							0.2	74.00	14.50	54.13	56.04	75.00	2.286
0.3	71.24	15.10	52.92	55.03	74.07	2.145
							0.4	70.40	14.39	50.68	52.68	74.15	2.098
0.5	68.81	13.69	47.03	48.98	73.78	1.946

As can be seen from Table 2, L increases with the amount of Tb (III, IV) doping^*The value decreases from 78.12(x ═ 0) to 68.81(x ═ 0.5), indicating a gradual darkening of the pigment colour b^*The value decreased from 56.83(x ═ 0) to 47.03(x ═ 0.5), indicating that the yellow color of the dye was weak and the color of the synthetic dye was light yellow, light yellow to dark yellow, and Bi in Table 3_3-xFe_xYO₆、Bi₃Y_1-xTb_xO_6+δNear infrared reflectance and solar reflectance values.

TABLE 3 near Infrared reflectance and solar reflectance values of the pigments

From tables 1 and 2 the saturation of the pigments (C)^*) And hue angle (H °), the doping of fe (III) and Tb (III, IV) greatly increases the saturation of the pigment, and the doping of fe (III) changes the pigment from yellow to red. Doping of Tb (III, IV) causes the pigment to slowly progress from the yellow region to the dark yellow region.

Bi₃Y_1-xTb_xO_6+δThe near infrared reflection spectrum of the pigment is shown in FIG. 4 (c). Bi powder measured according to ASTM Standard G173-03₃Y_1-xTb_xO_6+δThe near infrared solar reflection spectrum of the pigment is shown in FIG. 4 (d). As can be seen from the reflection spectra, the Tb (III, IV) doped pigments all have high near infrared reflectance, all above 85% (Table 3). With the increase of the doping amount of Tb (III, IV), the near-infrared reflectivity is reduced from 99.5829% to 88.6382% (x is 0.05). Although the incorporation of Tb (III, IV) decreases the reflectance of the pigment, the incorporation of Tb (III, IV) increases the richness of the pigment color. This helps to meet public color needs.

5. Acid and alkali resistance of pigment

Mixing a typical pigment Bi₃YO₆、Bi_3-xFe_xYO₆(x ═ 0.4) and Bi₃Y_1-xTb_xO_6+δ(x is 0.5) are respectively soaked in 5% HNO₃、5％H₂SO₄And 5% NaOH solution. Then stirred with a magnetic stirrer at a speed of 100r/min for 10 minutes. After filtering and washing the pigment with alcohol and deionized water, the pigment was dried at 100 ℃. The color coordinates of the treated samples were measured separately and compared to the original samples. As can be seen from tables 4-6, the total color difference

Less than 1.08 in all samples, where

Color difference

The difference of the color change of the immersed pigment can be visually judged, and the difference is also called as color difference. The larger the value, the worse the acid-base resistance of the pigment and vice versa. The Δ E value is between 1.6 and 3.2, and the human eye can not distinguish the chromatic aberration basically. Only a few professional level displays can achieve this difference; between 3.2 and 6.5, professionally trained people can discern the difference, but the difference is not observable by ordinary people. Between 6.5 and 13, the color difference is already discernible, but the hue itself is the same. At 13 to 25, the different expression of different hues can be determined, and the color membership can be identified; when it exceeds 25, another color is indicated. Values below 6 may be acceptable, indicating that the synthesized pigment is chemically stable to the acid/base tested.

TABLE 4 Bi after acid and alkali resistance test₃YO₆Color coordinates of pigments

TABLE 5 Bi after acid and alkali resistance test_3-xFe_xYO₆(x ═ 0.4) color coordinates of the pigments

TABLE 6 Bi after acid and alkali resistance test₃Y_1-xTb_xO_6+δ(x ═ 0.5) color coordinates of the pigment

6. Evaluation of near Infrared reflectance Properties of synthetic pigments

To evaluate the near infrared reflectance properties of the synthetic pigments, a common iron oxide yellow pigment (①) and three typical pigments Bi_3-xFe_xYO₆(x＝0.4)(②)、Bi₃YO₆(③)、Bi₃Y_1-xTb_xYO_6+δ(x-0.05) (④) were each coated onto 10cm x 8cm galvanized panels at a pigment to alkyd mass ratio of 1:1, the pigment sample was thoroughly mixed with the alkyd resin and poured onto the galvanized panels to allow self-slip until the pigment completely filled the entire galvanized panel.

After the coating is completely dried, the galvanized plates are dispersed on the four heat insulation plates, and the temperature of the four galvanized plates is monitored by an infrared thermal imager at intervals of time under infrared light. The test results are shown in fig. 5-6, and the color coordinates of the pigment coatings are shown in table 7. As can be seen from Table 7, Bi_3-xFe_XO₆(x ═ 0.4) and yellow iron oxide are very close in color coordinates.

The temperature recording mode of the thermal infrared imager is as follows: the highest temperature marking mode. As shown in fig. 6, the highest temperature point of the temperature measurement interface was always on the galvanized sheet coated with the iron oxide yellow pigment. At the end of the test, the temperature of the galvanized sheet coated with yellow iron oxide pigment and the Bi coating₃YO₆The temperature difference of the galvanized sheet is 20 ℃, namely the galvanized sheet is plated with Bi_3-xFe_xYO₆The temperature difference between the galvanized sheet with (x ═ 0.4) and the galvanized sheet coated with the iron oxide yellow pigment was more than 5 ℃, and it can be seen that the prepared pigment had high near infrared reflection properties and color characteristics.

TABLE 7 iron oxide yellow and Bi_3-xFe_xYO₆(x＝0.4)、Bi₃YO₆And Bi₃Y_1-xTb_xO_6+δ(x ═ 0.05) color coordinates of pigmented coatings

Pigment (I)	L^*	a^*	b^*	C^*	H°
						Bi₃YO₆	68.39	20.77	59.48	63.00	70.75
Bi_3-xFe_xYO₆(x＝0.4)	53.70	19.37	43.03	47.19	65.77
						Bi₃Y_1-xTb_xO_6+δ(x＝0.05)	66.65	18.27	46.40	49.87	68.51
Iron oxide yellow	54.25	17.45	41.82	45.31	67.35

In conclusion, for the first time, Bi doped with Fe (III) and Tb (III, IV) is synthesized by adopting a high-temperature calcination method₃YO₆An inorganic pigment. The calcined pigment has low strength and is in a relatively loose state. All pigments have a disordered fluorite structure. The Fe (III) doped pigments have a tendency to redden and the other pigments to deep yellow, probably due to the addition of suitable chromophoric metal ions, the Tb (III, IV) doped pigments have a good near-infrared solar reflectance of more than 83% in the range of 700-2300 nm. In addition, the fe (iii) doped pigments also have a higher near infrared solar reflectance (x 0.15, solar reflectance 76.4779) at lower doping levels. The galvanized sheet coated with the pigment was about 20 ℃ lower than the blank galvanized sheet under infrared light irradiation. The prepared pigment has the advantages of near infrared reflection and heat insulation.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. Bi doped with iron element₃YO₆An inorganic pigment characterized by the following general structural formula: bi_3-xFe_xYO₆Wherein the element Fe is Fe (III).

2. The Bi of claim 1₃YO₆An inorganic pigment characterized by: the value range of X is as follows: x is more than or equal to 0.05 and less than or equal to 0.8.

3. The Bi of claim 2₃YO₆An inorganic pigment characterized by: the inorganic pigment has a disordered fluorite structure of Fm-3m space group.

4. Bi doped with terbium element₃YO₆An inorganic pigment characterized by the following general structural formula: bi₃Y_1-xTb_xO_6+δWherein the element Tb is Tb (III, IV).

5. The Bi of claim 4₃YO₆An inorganic pigment characterized by: the value range of X is as follows: x is more than or equal to 0.01 and less than or equal to 0.1.

6. The Bi of claim 5₃YO₆An inorganic pigment characterized by: the inorganic pigment has a disordered fluorite structure of Fm-3m space group.

7. The Bi of any one of claims 1 to 6₃YO₆The preparation method of the inorganic pigment is characterized by comprising the following steps:

(3) drying the mixed powder, and calcining the dried mixed powder;

8. The method of claim 7, wherein: the calcining process comprises the following steps: the reaction was first carried out at 800 ℃ for 90 minutes and then heated to 900 ℃ for 120 minutes.

9. The Bi of any one of claims 1 to 6₃YO₆The application of the inorganic pigment is characterized in that the inorganic pigment is used for painting the exterior of a building or an oil and gas storage tank.