Preparation of aluminium phosphates by the reaction of diphosphorus pentaoxide (O'-form) and .ALPHA.-alumina.

The phase relation along the binary join of AlPO, were investigated up to 400°C using starting materials made by a solution route. Precursor structures used were boehmite (AIOOH), H,PO,, noncrystalline silica, and quartz. The silica precursors acted as structural seeds for the epitaxial growth of AlPO,. Studies showed that SiO, and AlP0, were the only crystalline and noncrystalline phases present along the binary join, and no substantial crystalline solution or any ternary phase was observed. Three polymorphic forms of AlPO,, i.e., berlinite, tridymite, and cristobalite, coexisted as low as 200°C. The nature of the silica precursor greatly influenced the development of the polymorphic phases of AIPO,. The low-quartz precursor suppressed the formation of the cristobalite form of AlPO, and favored berlinite (AlPO, quartz) production. On the other hand, noncrystalline silica with a cristobalite-like broad X R D peak suppressed the formation of berlinite and enhanced that of the cristobalite form of AlPO,. These precursor effects indicate that heteroepitaxy is very significant during the nucleation and growth of A1P04 phases on the suqace of SiO, particles even in these low-temperature reactions, [

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Structural Control of Phase Formation in Low‐Tem perature AIPO₄—Sio₂ Reactions

Takahashi

Agrawal

Roy

1989

Journal of the American Ceramic Society

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Preparation of aluminium phosphates by the reaction of diphosphorus pentaoxide (O'-form) and .ALPHA.-alumina.

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Structural Control of Phase Formation in Low‐Tem perature AIPO₄—Sio₂ Reactions

Structural Control of Phase Formation in Low‐Tem perature AIPO₄—Sio₂ Reactions

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Preparation of aluminium phosphates by the reaction of diphosphorus pentaoxide (O'-form) and .ALPHA.-alumina.

Cited by 1 publication

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Structural Control of Phase Formation in Low‐Tem perature AIPO4—Sio2 Reactions

Structural Control of Phase Formation in Low‐Tem perature AIPO4—Sio2 Reactions

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Structural Control of Phase Formation in Low‐Tem perature AIPO₄—Sio₂ Reactions

Structural Control of Phase Formation in Low‐Tem perature AIPO₄—Sio₂ Reactions