Natrolites with different Fe2+/Fe3+ cation ratios

Yongmoon Lee, Thomas Vogt, Yongjae Lee

Research output: Contribution to journalArticle

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Abstract

We report the synthesis and structural characterization of two iron-exchanged natrolites, Fe2+ 4.0Fe3+ 2.7Al16Si24O80·29(1)H2O (Fe-NAT4951) and Fe2+ 6.4Fe3+ 1.1Al16Si24O80·24H2O (Fe-NAT8119) at different pressures and temperatures using ambient, high-temperature and in-situ high-pressure synchrotron powder X-ray diffraction, Mössbauer spectroscopy and extended X-ray absorption fine structure (EXAFS). At ambient conditions, Fe-NAT4951 crystallizes in an orthorhombic structure with space group Fdd2 whereas the structure of Fe-NAT8119 is monoclinic with Cc symmetry. Due to the presence of more H2O molecules in Fe-NAT4951 the channels are more circular as indicated by a T5O10(T = Si,Al) chain rotation angle of 12.6(1)° compared to 20.4(1)° in Fe-NAT8119. The coordination number of the Fe2+and Fe3+cations in the channels of Fe-NAT4951 is 3 and 4, whereas Fe-NAT8119 has 7- and 4-fold coordination, respectively. The two materials behave differently under hydrostatic pressures: due to a discontinuous pressure-induced hydration the volume of Fe-NAT8119 expands by 14.1(1) % near 1.0(1) GPa, whereas the volume of Fe-NAT4951 gradually decreases with pressure. Under increasing temperature and as a result of abrupt dehydration, the unit cell volume of Fe-NAT4951 contracts by ca. 8.3(1) % near 125(1) °C whereas Fe-NAT8119 contracts only by ca. 5.0(1) % near 225(5) °C.

Original languageEnglish
Pages (from-to)109-118
Number of pages10
JournalMicroporous and Mesoporous Materials
Volume244
DOIs
Publication statusPublished - 2017 Jan 1

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Cations
Positive ions
cations
coordination number
dehydration
hydrostatic pressure
ambient temperature
hydration
X ray absorption
synchrotrons
x rays
Hydrostatic pressure
fine structure
Synchrotrons
Dehydration
Hydration
X ray powder diffraction
Temperature
iron
Iron

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, Yongmoon ; Vogt, Thomas ; Lee, Yongjae. / Natrolites with different Fe2+/Fe3+ cation ratios. In: Microporous and Mesoporous Materials. 2017 ; Vol. 244. pp. 109-118.
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abstract = "We report the synthesis and structural characterization of two iron-exchanged natrolites, Fe2+ 4.0Fe3+ 2.7Al16Si24O80·29(1)H2O (Fe-NAT4951) and Fe2+ 6.4Fe3+ 1.1Al16Si24O80·24H2O (Fe-NAT8119) at different pressures and temperatures using ambient, high-temperature and in-situ high-pressure synchrotron powder X-ray diffraction, M{\"o}ssbauer spectroscopy and extended X-ray absorption fine structure (EXAFS). At ambient conditions, Fe-NAT4951 crystallizes in an orthorhombic structure with space group Fdd2 whereas the structure of Fe-NAT8119 is monoclinic with Cc symmetry. Due to the presence of more H2O molecules in Fe-NAT4951 the channels are more circular as indicated by a T5O10(T = Si,Al) chain rotation angle of 12.6(1)° compared to 20.4(1)° in Fe-NAT8119. The coordination number of the Fe2+and Fe3+cations in the channels of Fe-NAT4951 is 3 and 4, whereas Fe-NAT8119 has 7- and 4-fold coordination, respectively. The two materials behave differently under hydrostatic pressures: due to a discontinuous pressure-induced hydration the volume of Fe-NAT8119 expands by 14.1(1) {\%} near 1.0(1) GPa, whereas the volume of Fe-NAT4951 gradually decreases with pressure. Under increasing temperature and as a result of abrupt dehydration, the unit cell volume of Fe-NAT4951 contracts by ca. 8.3(1) {\%} near 125(1) °C whereas Fe-NAT8119 contracts only by ca. 5.0(1) {\%} near 225(5) °C.",
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Natrolites with different Fe2+/Fe3+ cation ratios. / Lee, Yongmoon; Vogt, Thomas; Lee, Yongjae.

In: Microporous and Mesoporous Materials, Vol. 244, 01.01.2017, p. 109-118.

Research output: Contribution to journalArticle

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AU - Lee, Yongmoon

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AU - Lee, Yongjae

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N2 - We report the synthesis and structural characterization of two iron-exchanged natrolites, Fe2+ 4.0Fe3+ 2.7Al16Si24O80·29(1)H2O (Fe-NAT4951) and Fe2+ 6.4Fe3+ 1.1Al16Si24O80·24H2O (Fe-NAT8119) at different pressures and temperatures using ambient, high-temperature and in-situ high-pressure synchrotron powder X-ray diffraction, Mössbauer spectroscopy and extended X-ray absorption fine structure (EXAFS). At ambient conditions, Fe-NAT4951 crystallizes in an orthorhombic structure with space group Fdd2 whereas the structure of Fe-NAT8119 is monoclinic with Cc symmetry. Due to the presence of more H2O molecules in Fe-NAT4951 the channels are more circular as indicated by a T5O10(T = Si,Al) chain rotation angle of 12.6(1)° compared to 20.4(1)° in Fe-NAT8119. The coordination number of the Fe2+and Fe3+cations in the channels of Fe-NAT4951 is 3 and 4, whereas Fe-NAT8119 has 7- and 4-fold coordination, respectively. The two materials behave differently under hydrostatic pressures: due to a discontinuous pressure-induced hydration the volume of Fe-NAT8119 expands by 14.1(1) % near 1.0(1) GPa, whereas the volume of Fe-NAT4951 gradually decreases with pressure. Under increasing temperature and as a result of abrupt dehydration, the unit cell volume of Fe-NAT4951 contracts by ca. 8.3(1) % near 125(1) °C whereas Fe-NAT8119 contracts only by ca. 5.0(1) % near 225(5) °C.

AB - We report the synthesis and structural characterization of two iron-exchanged natrolites, Fe2+ 4.0Fe3+ 2.7Al16Si24O80·29(1)H2O (Fe-NAT4951) and Fe2+ 6.4Fe3+ 1.1Al16Si24O80·24H2O (Fe-NAT8119) at different pressures and temperatures using ambient, high-temperature and in-situ high-pressure synchrotron powder X-ray diffraction, Mössbauer spectroscopy and extended X-ray absorption fine structure (EXAFS). At ambient conditions, Fe-NAT4951 crystallizes in an orthorhombic structure with space group Fdd2 whereas the structure of Fe-NAT8119 is monoclinic with Cc symmetry. Due to the presence of more H2O molecules in Fe-NAT4951 the channels are more circular as indicated by a T5O10(T = Si,Al) chain rotation angle of 12.6(1)° compared to 20.4(1)° in Fe-NAT8119. The coordination number of the Fe2+and Fe3+cations in the channels of Fe-NAT4951 is 3 and 4, whereas Fe-NAT8119 has 7- and 4-fold coordination, respectively. The two materials behave differently under hydrostatic pressures: due to a discontinuous pressure-induced hydration the volume of Fe-NAT8119 expands by 14.1(1) % near 1.0(1) GPa, whereas the volume of Fe-NAT4951 gradually decreases with pressure. Under increasing temperature and as a result of abrupt dehydration, the unit cell volume of Fe-NAT4951 contracts by ca. 8.3(1) % near 125(1) °C whereas Fe-NAT8119 contracts only by ca. 5.0(1) % near 225(5) °C.

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