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Elovikov D.P., et al. Nanosystems: Phys. Chem. Math., 2022,13 (6), 662-667.
http://nanojournal.ifmo.ru
Original article
DOI 10.17586/2220-8054-2022-13-6-662-667
Thermal stability of the waylandite-structured nanocrystalline BiAl3(PO4)2(OH)6
Dmitry P. Elovikov1'2'", OlgaV. Proskurina1'3'6, Maria V. Tomkovich1c, ValeryL. Ugolkov4 d, Victor V. Gusarov1e
1 loffe Institute, St. Petersburg, Russia
2St. Petersburg Electrotechnical University "LETI", St. Petersburg, Russia
3St. Petersburg State Institute of Technology, St. Petersburg, Russia
4I. V. Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Sciences,
St. Petersburg, Russia
[email protected], [email protected],[email protected], [email protected], [email protected]
Corresponding author: Dmitry P. Elovikov, [email protected]
Abstract A nanocrystalline powder of the waylandite-structured bismuth hydroaluminophosphate was obtained under hydrothermal conditions at 200 °C, 7 MPa and pH 7, and characterized by X-ray diffractometry, scanning electron microscopy (SEM), and energy dispersive microanalysis (EDAX). The simultaneous thermal analysis and high-temperature X-ray diffractometry have shown that the crystal-chemical formula of this compound can be represented as BiAl3(PO4)2O(OH)4-(H2O). This compound retains its structure and crystallite size (-65 nm) up to about 500 °C. It has been determined that the decomposition of this compound in the 540-800 °C range results in the formation of Bi2O3, Bi2Al4O9 and AlPO4 phases. At temperatures above 800 °C, a complete thermal decomposition of Bi2Al4O9 and the formation of crystalline a-Al2O3 occur in this system, while Bi2O3 keeps evaporating during the isothermal exposure.
Keywords nanocrystals, waylandite-structured, BiAl3(PO4)2O(OH)4(H2O), thermal stability, hydrothermal synthesis, nature-like technologies.
Acknowledgements X-ray diffraction studies and elemental analyses of samples were performed employing the equipment of the Engineering Center of the St. Petersburg State Institute of Technology (Technical University). The research was supported by the Russian Science Foundation Grant 21-13-00260
For citation Elovikov D.P., Proskurina O.V., Tomkovich M.V., Ugolkov V.L., Gusarov V.V. Thermal stability of the waylandite-structured nanocrystalline BiAl3(PO4)2(OH)6. Nanosystems: Phys. Chem. Math., 2022, 13 (6), 662-667.
1. Introduction
In recent years, there has been an active interest in the development of new functional materials based on synthetic minerals and of their technologies (nature-like technologies). Such interest is primarily due to the possibility of obtaining new materials with unique properties [1-3].
Phosphates of the alunite supergroup are an extensive class of inorganic compounds with the AB3(PO4)2(OH)6 chemical formula, where A is Ce, La, Nb, Sm, Ca, Sr, Pb, Ba, Bi, and B is Al, Fe, V; they are similar in their structural parameters, syngony (trigonal/hexagonal), space group (R3m), and represent crystals with the hexagonal scalenohedron geometry [4-10].
The relevance of obtaining and studying such phosphates, in particular, lies in the prospects of using them as matrices for toxic and radioactive waste due to their structural features, thermal stability and high ability to ionic substitution of toxic Hg, As, Tl, Sb, Cr, Ni, Ca, radioactive K, Sr, Th, U, Ra, Pb and rare earths [10-14]. Data on the synthesis of these compounds are scanty and have a number of shortcomings. This is determined by the fact that the preparation of such compounds is complicated by the long duration of crystalline phases formation, from two weeks to six months [11,12,15,16]. It should be noted that in some of the listed works the performed synthesis used natural minerals and yielded mixtures of phases rather than individual compounds. The mentioned works contain no data on the kinetics and mechanisms of compounds formation.
The study of the thermal behavior of phases is of fundamental scientific interest. An analysis of the literature on the thermal stability of phosphates of the alunite supergroup showed the paucity of the available data [12,15,17,18]. In most scientific works, the objects of study are natural minerals which contain impurity components and are phases of variable composition. Phosphates of the alunite supergroup tend to include impurity cations and anions from the environment
© Elovikov D.P., Proskurina O.V., Tomkovich M.V., Ugolkov V.L., Gusarov V.V., 2022
into their structure, which affects the results of studying their properties. There are no data on the study of individual compounds.
To obtain hydroxide and oxide phases, methods of hydrothermal, hydrothermal-microwave and hydrothermal-ultrasonic treatment [19-24] are widely used. Hydrothermal synthesis has produced many artificial analogs of minerals [25-30] positively differing from natural ones by the strictly defined composition and morphology, and prescribed size distribution of particles. An analysis of the currently available scientific literature has shown that the waylandite-structured BiAl3(PO4)2(OH)6 crystalline phase was successfully obtained for the first time under hydrothermal conditions [31].
There is no information on the thermal stability and thermal behavior of the BiAl3(PO4)2(OH)6 compound. In this regard, the present work is aimed at studying the thermal stability of the waylandite-structured nanocrystalline BiAl3(PO4)2 (OH)6.
2. Experimental
To obtain waylandite-structured nanocrystalline BiAl3(PO4)2(OH)6 under hydrothermal conditions, the following reagents were used: Bi(NO3)3-5H2O (p.a.), Al(NO3)3 9H2O (puriss.), (NH4)2HPO4 (p.a.), HNO3 (puriss. spec.), and NaOH (puriss.). Bismuth and aluminum nitrate samples, calculated to obtain BiAl3(PO4)2(OH)6, were dissolved in 6 M aqueous HNO3 solution with stirring until complete dissolution. An aqueous solution of (NH4)2HPO4 prepared by dissolving a sample calculated according to stoichiometry in distilled water, was added dropwise to the resulting solution. Next, a 4 M aqueous NaOH solution was added dropwise to the resulting suspension with stirring, until pH 7 was reached.
Hydrothermal treatment of suspensions was carried out in steel autoclaves with Teflon chambers at 200 °C and a pressure of 7 MPa for 12 days in a hydrothermal fluid at pH=7. The resulting precipitate was separated by centrifugation, rinsed with distilled water until neutral, and dried at 80 °C for 6 hours.
The determination of the morphology and particle size, and of elemental composition of the samples was carried out by scanning electron microscopy (SEM) and energy dispersive microanalysis (EDAX) using a Tescan Vega 3 SBH electron microscope (TESCAN Brno, Czech Republic) with an Inca X-Act elemental analysis attachment (Oxford Instruments plc, Great Britain).
X-ray diffraction measurements of the powder sample were carried out on a Rigaku SmartLab 3 diffractometer (Rigaku, Japan), equipped with an X-ray tube with a copper anode, in the Bragg-Brentano geometry. CuKa doublet radiation was monochromatized using a nickel K filter. The shooting was carried out in air at a constant temperature of 25 °C. The size of the crystallites was calculated by the Hall method for peaks 10T1, 1120, 1123, 0224 and 3033.
The high-temperature X-ray diffraction analysis of the powder sample was carried out on an XRD-7000 diffractome-ter (Shimadzu, Japan) with an HTK 1200 N high-temperature attachment (Anton Paar, Austria).
Possible crystalline phases were identified using PDF-2 (Powder Diffraction File-2) [32] and Crystallography Open Database [33] powder databases.
The simultaneous thermal analysis coupled with mass spectrometry for the analysis of evolved gases employed an STA 429 CD in combination with a QMS 403 C (NETZSCH, Germany) quadrupole mass spectrometer with a heating rate of 10 °C/min from 25 to 950 °C.
3. Results and discussion
Thermal studies were carried out on powdered nanocrystalline BiAl3(PO4)2(OH)6 obtained by hydrothermal synthesis at pH 7. The elemental analysis showed that the bismuth, aluminum and phosphorus ratio in the initial samples corresponds to the stoichiometry of the individual BiAl3(PO4)2(OH)6 compound with an error in determining the elemental composition up to 5 at. %. All peaks in the X-ray diffraction pattern (Fig. 1) correspond to the waylandite-structured BiAl3(PO4)2(OH)6 [31]. The crystallite size is -65 nm.
According to the SEM data presented in Fig. 2, it can be seen that the compound particles after synthesis are represented by rod-like aggregates composed by smaller particles. At heating the sample up to 1000 °C, the particle morphology changes only slightly, while the heating to temperatures above 1000 °C leads to a sharp change in particle morphology (Fig. 2).
According to the simultaneous thermal analysis data using mass spectrometry, four areas of water release from the sample can be noted (Fig. 3).
The first region (80-318 °C), characterized by a loss of —1 wt. %, is associated with the removal of the adsorbed water from the sample. The second region (318-498 °C), characterized by a loss of—3.5 wt. % of water, is associated with an endothermic effect that is well pronounced in the thermogram and can be associated with the removal of a part of water from the BiAl3(PO4)2(OH)6 compound. At the same time, according to the X-ray diffraction data, the initial structure of waylandite does not undergo any changes (Fig. 4). Consequently, it would be apparently more correct to represent the crystal-chemical formula of this compound as BiAl3(PO4)2(OH)4 (H2O). In this regard, this formula is similar to that adopted for the CaAl3(PO4MOHV(H2O) compound with a similar structure [17]. The third (498-597 °C) and fourth (597-600 °C) regions, which are difficult to separate from each other according to thermogravimetric data and the results of differential thermal analysis, and are characterized by a weight loss of —3.2 and —2.4 wt. %, respectively, are associated with the process of BiAl3(PO4)2(OH)4 (H2O) dehydroxylation. In this case, sample amorphization occurs
Fig. 1. X-ray diffraction pattern of BiAl3(PO4)2(OH)6 synthesized under hydrothermal conditions. The X-ray diffraction pattern shows the Miller-Brave (hkil) indices of the most intense peaks of the waylandite-structured compound
Fig. 2. SEM images of samples before and after heat treatment at 1000 and 1200°C
after the removal of all water from it. According to the calculation of the mass loss by the sample, each of the regions Nos. 2, 3, and 4 (Fig. 3) accounts for the removal of one H2O molecule per BiAl3(PO4)2(OH)4 (H2O) formula.
Thus, the above-described processes of stepwise separation of water from the compound can be represented as follows:
318-498 °C : BiAl3(PO4)2O(OH)4 • H2O ^ BiAl3(PO4)2O(OH)4 + H2O 498-597 °C : BiAl3(PO4)2O(OH)4 ^ BiAl3(PO4)2O2(OH)2 + H2O 597-600 °C : BiAl3(PO4)2O2(OH)2 ^ [0.5Bi2O3 • 1.5Al2O3 • P2O5] + H2O It should be noted that the presented scheme suggests that a possibly metastable BiAl3 (PO4)2 O2 (OH)2 phase exists in a very narrow temperature range (about 597 °C).
According to high-temperature X-ray diffraction data, the onset of decomposition of the waylandite-structured phase with the appearance of peaks of the Bi2 Al4O9 phase, is observed at temperatures of about 500 °C (Fig. 4). During the isothermal exposure of the sample at 540 ° C for about 30 min, peaks of the waylandite-structured phase are already weakly expressed in the diffraction pattern, and the appearance of trace amounts of crystalline AlPO4 can be noticed in addition to peaks of the Bi2 Al4O9 phase (Fig. 4). Some temperature shift of phase transformation effects to lower temperatures according to high-temperature diffraction data compared to the data of simultaneous thermal analysis, is explained by the difference in sample heating conditions. The higher temperatures of the effects recorded by the simultaneous thermal
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Fig. 3. Simultaneous thermal analysis data for the nanocrystalline BiAl3(PO4)2(ОН)б synthesized under hydrothermal conditions
Fig. 4. High-temperature X-Ray diffraction data for the nanocrystalline BiAl3(PO4)2O(OH)4(H2O) obtained under hydrothermal conditions.
analysis, are explained by the thermal inertia of the system, which always manifests itself under conditions of a constant heating rate [34,35] of the samples. The exothermic peaks in the 656-720 °C temperature range noticed in the DTA curve (Fig. 3) are apparently associated with crystallization of the Bi2Al4O9-, Bi2O3- and AlPO4-based phases from the amorphous phase that formed during BiAl3(PO4)2(OH)4 (H2O) dehydration. According to high-temperature X-ray diffraction data, the process of crystallization of these phases can be considered almost complete at a temperature of about 800 °C (Fig. 4). Endothermic peaks in the 810-885 °C range in the DTA curve (Fig. 3) are associated, as can be concluded from the literature data [36-38], with the processes of eutectic phase melting and, possibly, phase transitions in the Bi2O3-Al2O3-P2O5 system.
It should be noted that according to the data on the broadening of X-ray diffraction lines, the sizes of crystallites in the waylandite-structured phase remain at a level of —65 nm within the entire temperature range of its existence (25-500 °C).
An analysis of high-temperature X-ray diffraction data (Fig. 3) and elemental analysis of the samples, which showed a sharp decrease in the bismuth content at processing temperatures above 900 °C, evidence that bismuth aluminate Bi2Al4O9 decomposition at these temperatures is accompanied by melting and evaporation of bismuth oxide Bi2O3, which is consistent with the data from phase diagrams [36-38].
4. Conclusions
It has been shown that rod-like particles, which are aggregates of nanocrystals based on a waylandite-structured phase, form under hydrothermal conditions at pH 7. The crystal-chemical formula of the corresponding compounds can be represented as BiAl3(PO4)2O(OH)4 (H2O). It has been established that the structure of this compound is thermally stable up to about 500 °C, despite the fact that partial dehydration of the compound and formation of BiAl3(PO4)2O(OH)4 take place in the temperature range of about 300-500 ° C. The size of phase crystallites remains at a level of about 65 nm in the temperature range up to 500 °C. The complete dehydration of the compound with the formation of an amorphous phase occurs in the range of 500-600 °C. The heating up to 800 °C leads to the formation of a mixture of AlPO4, Bi2O3, and Bi2Al4O9 crystalline phases. An increase of the temperature up to 900 °C and above leads to the decomposition of bismuth aluminate Bi2Al4O9 and the evaporation of bismuth oxide.
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Submitted 29 August 2022; accepted 17 October 2022
Information about the authors:
Dmitry P. Elovikov - Ioffe Institute, 194021 St. Petersburg, Russia; St. Petersburg Electrotechnical University "LETI", 197022 St. Petersburg, Russia; ORCID 0000-0003-4345-6086; [email protected]
Olga V Proskurina - Ioffe Institute, 194021 St. Petersburg, Russia; St. Petersburg State Institute of Technology, 190013 St. Petersburg, Russia; ORCID 0000-0002-2807-375X; [email protected]
Maria V Tomkovich - Ioffe Institute, 194021 St. Petersburg, Russia; ORCID 0000-0002-1537-4107; [email protected]
Valery L. Ugolkov -1. V. Grebenshchikov Institute of Silicate Chemistry of the Russian Academy of Sciences, 199034 St. Petersburg, Russia; ORCID 0000-0003-2895-0625; [email protected]
Victor V Gusarov - Ioffe Institute, 194021 St. Petersburg, Russia; ORCID 0000-0003-4375-6388; [email protected]
Conflict of interest: the authors declare no conflict of interest.
