Contrasting high-pressure compression behaviors of AlPO4-5 and SSZ-24 with the same AFI framework topology

Taehwa Kim, Yongjae Lee, Young Nam Jang, Jiho Shin, Suk Bong Hong

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The high-pressure structures of AlPO4-5 (Al12P12O48•9.9H2O) and SSZ-24 (Si24O48) with the same AFI framework topology were studied using synchrotron X-ray powder diffraction and a pore-penetrating (at a mixture of 16:3:1 by volume of methanol:ethanol:water) pressure medium. An analysis of the diffraction profiles of the AlPO4-5 reveals that the a-axis length expands initially before it starts to contract, whereas the c-axis contracts steadily throughout the pressure range up to 5 GPa. As a result, the unit cell volume at 0.7(1) GPa appears larger by 3σ than that at ambient conditions, and the bulk modulus after this initial volume expansion is calculated to 50.5(7) GPa. In the SSZ-24, the unit cell contraction is monotonic with a steeper slope than that of AlPO4-5 leading to a smaller bulk modulus of 21.7(3) GPa. The reason for the two contrasting compression behaviors of the AFI frameworks is suspected to be related to the difference in the hydrophobicity of the framework and hence the water distribution in the channel. To evaluate the effect of the pressure medium, the experiment on SSZ-24 was repeated using a non-penetrating silicone oil pressure medium and laboratory X-ray powder diffraction. The bulk modulus of SSZ-24 was found to the same low value of 21.7(3) GPa demonstrating that the measured compressibility of SSZ-24 is inherent to the AFI framework type.

Original languageEnglish
Pages (from-to)42-46
Number of pages5
JournalMicroporous and Mesoporous Materials
Volume169
DOIs
Publication statusPublished - 2013 Mar 1

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bulk modulus
topology
Topology
diffraction
Elastic moduli
water pressure
X ray powder diffraction
silicones
hydrophobicity
cells
compressibility
contraction
synchrotrons
ethyl alcohol
x rays
Silicone Oils
methyl alcohol
oils
Water
slopes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

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title = "Contrasting high-pressure compression behaviors of AlPO4-5 and SSZ-24 with the same AFI framework topology",
abstract = "The high-pressure structures of AlPO4-5 (Al12P12O48•9.9H2O) and SSZ-24 (Si24O48) with the same AFI framework topology were studied using synchrotron X-ray powder diffraction and a pore-penetrating (at a mixture of 16:3:1 by volume of methanol:ethanol:water) pressure medium. An analysis of the diffraction profiles of the AlPO4-5 reveals that the a-axis length expands initially before it starts to contract, whereas the c-axis contracts steadily throughout the pressure range up to 5 GPa. As a result, the unit cell volume at 0.7(1) GPa appears larger by 3σ than that at ambient conditions, and the bulk modulus after this initial volume expansion is calculated to 50.5(7) GPa. In the SSZ-24, the unit cell contraction is monotonic with a steeper slope than that of AlPO4-5 leading to a smaller bulk modulus of 21.7(3) GPa. The reason for the two contrasting compression behaviors of the AFI frameworks is suspected to be related to the difference in the hydrophobicity of the framework and hence the water distribution in the channel. To evaluate the effect of the pressure medium, the experiment on SSZ-24 was repeated using a non-penetrating silicone oil pressure medium and laboratory X-ray powder diffraction. The bulk modulus of SSZ-24 was found to the same low value of 21.7(3) GPa demonstrating that the measured compressibility of SSZ-24 is inherent to the AFI framework type.",
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Contrasting high-pressure compression behaviors of AlPO4-5 and SSZ-24 with the same AFI framework topology. / Kim, Taehwa; Lee, Yongjae; Jang, Young Nam; Shin, Jiho; Hong, Suk Bong.

In: Microporous and Mesoporous Materials, Vol. 169, 01.03.2013, p. 42-46.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Contrasting high-pressure compression behaviors of AlPO4-5 and SSZ-24 with the same AFI framework topology

AU - Kim, Taehwa

AU - Lee, Yongjae

AU - Jang, Young Nam

AU - Shin, Jiho

AU - Hong, Suk Bong

PY - 2013/3/1

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