On the chemical bond type in AlPO<sub>4</sub>

Brill, R.; Debretteville, A. P.

doi:10.1107/s0365110x5500176x

Cited by 13 publications

(4 citation statements)

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“…It is also a refractory phase isostructural with silica with many polymorphs, the most common ones being berlinite (hexagonal), cristobalite (triclinic, hexagonal) and tridymite (orthorhombic, cubic) [ 16 ]. Those main polymorphs can be differentiated by X-Ray Diffraction (XRD) [17,18,19], Fourier-Transform Infrared (FTIR) [20,21,22] and Nuclear Magnetic Resonance (NMR) [23,24,25] spectroscopies. Finally, AlPO 4 also exists in various hydrated AlPO 4 .xH 2 O phases which can be characterized by XRD [26,27] and FTIR spectroscopy [22,27] as well.…”

Section: Introductionmentioning

confidence: 99%

Acid-based geopolymers: Understanding of the structural evolutions during consolidation and after thermal treatments

Mathivet

Jouin

Gharzouni

et al. 2019

Journal of Non-Crystalline Solids

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Materials such as ceramic matrix composites are developed for mechanical applications at high temperature, but their cost remains a limitation. Consequently, the use of acid-based geopolymer matrices may be an alternative to reduce costs. In this study, the sample was prepared from metakaolin and phosphoric acid. FTIR and NMR spectroscopies, XRD and thermal measurements were used to understand the structural evolution of acid-based geopolymers (binders) during consolidation and after thermal treatments. According to the results, the consolidation of the binder has been divided into four steps: the dissolution of the metakaolin, the polycondensation reactions forming AlPO 4 entities and hydrated phases, the breakdown of Si-O-Al bonds with formation of various hydrated silica *Manuscript Click here to download Manuscript: manuscript.docx Click here to view linked References

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Section: Introductionmentioning

confidence: 99%

Acid-based geopolymers: Understanding of the structural evolutions during consolidation and after thermal treatments

Mathivet

Jouin

Gharzouni

et al. 2019

Journal of Non-Crystalline Solids

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“…From a structural point of view, they can be divided into three main categories. The first one, being berlinite-type, 37 triclinic tridymite-type 38 and orthorhombic AlPO 4 39 show some up-down-up-down structures made of an alternation of corner sharing AlO 4 and PO 4 tetrahedra. 40 They are described as strict 6-ring structures, and are analogous of the polymorphs of silica.…”

Section: Discussionmentioning

confidence: 99%

Study of the formation of acid‐based geopolymer networks and their resistance to water by time/temperature treatments

et al. 2021

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Geopolymers, in their alkaline-based form, are now known since many years and are the subject of numerous studies due to their relative low cost and good mechanical performances. 1 They usually result from the dissolution of an aluminosilicate source in an alkaline silicate solution, 2 leading to the formation of a tridimensional network combining SiO 4 and AlO 4 tetrahedra. However, recently, acid-based geopolymers are gaining an increasing interest from the scientific community. These materials are related to the phosphate cements, which have been studied for a longer time. 3 Although this subject is quite recent, several studies, especially using phosphoric acid, have indeed been carried out considering various aluminosilicate sources and different Si/Al, Al/P or Si/P ratios. [4][5][6] These materials exhibit remarkable mechanical properties 4 and a high temperature resistance up to 1450°C. 7 Moreover, a previous study 8 has stated that their properties (thermal and water resistance) are governed by their composition and synthesis temperature 9,10 and can be closely related to the existence of different amorphous oxide networks in the material.The synthesis of these acid-based geopolymers starts with the dissolution of an aluminosilicate source in an acidic medium, the most common one being phosphoric acid. 11 A recent study showed that the subsequent release of Al 3+ and its

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“…(iii) The new borates PBO 4 and AsBO 4 form -together with NbBO 4 , TaBO 4 and the poorly known VBO 4 -the orthoborate subfamily, i.e. the only ABO 4 compounds with the A cations having a valence higher than +4; this could also mean that zircon-type borates could be the most uncompressible ABO 4 compounds, owing to the well known relationship between the bulk modulus and the formal charge of the A cation in zircon-type compounds (Errandonea & Manjó n, 2008;Brill & Debretteville, 1955). (iv) The existence of PBO 4 and AsBO 4 opens the door for the synthesis of new members of the borate family with A cations of a +5 valence, such as the yet unknown SbBO 4 and BiBO 4 compounds.…”

Section: Discussionmentioning

confidence: 99%

“…The nomenclature choice was also supported by the structure. Both compounds crystallize in the high-cristobalite structure, which is derived from the -quartz structure, comparable to the berlinite structure of aluminium phosphate (AlPO 4 ) and aluminium arsenate (AlAsO 4 ) (Machatschki, 1936;Brill & Debretteville, 1955).…”

Section: Introductionmentioning

confidence: 97%

Borates or phosphates? That is the question

Contreras‐García¹,

Izquierdo-Ruiz²,

Marqués³

et al. 2020

Acta Crystallogr A Found Adv

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Chemical nomenclature is perceived to be a closed topic. However, this work shows that the identification of polyanionic groups is still ambiguous and so is the nomenclature for some ternary compounds. Two examples, boron phosphate (BPO4) and boron arsenate (BAsO4), which were assigned to the large phosphate and arsenate families, respectively, nearly a century ago, are explored. The analyses show that these two compounds should be renamed phosphorus borate (PBO4) and arsenic borate (AsBO4). Beyond epistemology, this has pleasing consequences at several levels for the predictive character of chemistry. It paves the way for future work on the possible syntheses of SbBO4 and BiBO4, and it also renders previous structure field maps completely predictive, allowing us to foresee the structure and phase transitions of NbBO4 and TaBO4. Overall, this work demonstrates that quantum mechanics calculations can contribute to the improvement of current chemical nomenclature. Such revisitation is necessary to classify compounds and understand their properties, leading to the main final aim of a chemist: predicting new compounds, their structures and their transformations.

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On the chemical bond type in AlPO₄

Cited by 13 publications

References 0 publications

Acid-based geopolymers: Understanding of the structural evolutions during consolidation and after thermal treatments

Acid-based geopolymers: Understanding of the structural evolutions during consolidation and after thermal treatments

Study of the formation of acid‐based geopolymer networks and their resistance to water by time/temperature treatments

Borates or phosphates? That is the question

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On the chemical bond type in AlPO4

Cited by 13 publications

References 0 publications

Acid-based geopolymers: Understanding of the structural evolutions during consolidation and after thermal treatments

Acid-based geopolymers: Understanding of the structural evolutions during consolidation and after thermal treatments

Study of the formation of acid‐based geopolymer networks and their resistance to water by time/temperature treatments

Borates or phosphates? That is the question

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On the chemical bond type in AlPO₄