2000
DOI: 10.1088/0953-8984/12/30/301
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High pressure phase transformations in α-AlPO4: an x-ray diffraction investigation

Abstract: We have re-investigated the high pressure behaviour of berlinite AlPO4 (α-AlPO4) with x-ray diffraction using a powerful synchrotron x-ray source SPring-8. Our results show that it transforms to a crystalline phase beyond ~13 GPa. Our data seem to be consistent with a CrVO4 type of structure in the Cmcm space group, similar to the high pressure phase observed in some isostructural phosphate compounds. The persistence of the diffraction pattern up to 40 GPa establishes that the previously accepted amorphization… Show more

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Cited by 19 publications
(15 citation statements)
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“…In Table II, we also give the theoretical EOS of phases I, IV, and V. Phase I is the most compressible structure. A higher compressibility among orthophosphates is only found in quartz-like and berlinite-type phosphates [44,45]. Regarding phase IV, we found that it is less compressible than the three ambient pressure polymorphs.…”
Section: Room-temperature Equations Of Statementioning
confidence: 67%
“…In Table II, we also give the theoretical EOS of phases I, IV, and V. Phase I is the most compressible structure. A higher compressibility among orthophosphates is only found in quartz-like and berlinite-type phosphates [44,45]. Regarding phase IV, we found that it is less compressible than the three ambient pressure polymorphs.…”
Section: Room-temperature Equations Of Statementioning
confidence: 67%
“…In the latter case, experimental bulk moduli are again comparable at around 37 GPa, [27][28][29] whereas the Youngs moduli of the mixed metal framework are approximately 20 % lower. [30] In the same way as the highly flexible LiN 4 species lowered the elastic modulus of 2, it appears here that the reason for the lower elastic modulus of berlinite is down to the presence of the more flexible AlO 4 tetrahedron (AlO 4 > SiO 4 > PO 4 ).…”
Section: Resultsmentioning
confidence: 84%
“…The phase transition from an ambient crystalline phase to a high pressure amorphous structure has been suggested but later the high pressure phase has been identified to be a crystalline phase. 13,14 In contrast, besides its different initial structure compared to a-AlPO 4 , AFI has the unique porous structure, which could possibly allow some pressure transmission medium (PTM) molecules enter into their channels, and thus influences the host matrix behaviors, such as high pressure structural evolution and the framework stability. Also, such unique porous structure of AFI makes it an ideal template to study the interplay between the host material and guest molecules around the environment, which could contribute to revealing the mechanism in chemical and structural modifications of the porous framework structure and understanding the physical properties of the zeolites, such as the mechanical, electronic, and adsorbent properties for gas storage.…”
mentioning
confidence: 99%