Temperature related structural variation of the hydrous components in gypsum
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P.F. Schofield
Single crystal neutron diffraction studies have been carried out on a natural crystal of gypsum (CaSO4 · 2H20) at 50, 115 and 200 K. The structural refinements converged to Rw(F) = 0.072, 0.068 and 0.065 respectively and complement well previous refinements at 294 K. Large changes in the intermolecular hydrogen bonds is observed as a function of temperature. Significant variation between the two intramolecular O(w)-H bonds is evident at all temperatures. The distortion of the water molecules and the hydrogen bond angles display temperature independence. The thermal ellipsoids of the protons determined in our single crystal neutron diffraction experiment are strongly perpendicular to the O(w)-H···O(1) hydrogen bonds, with their orientations temperature independent and with no evidence of directionality of the protons along the hydrogen bond below 294 K.
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- Modified hydrothermal diamond anvil cells for XAFS analyses of elements with low energy absorption edges in aqueous solutions at sub- and supercritical conditions
- Edgeworth series expansion of the truncated Cauchy function and its effectiveness in the study of atomic heterogeneity
- Intergrowth polytypoids as modulated structures: the example of the cation deficient oxides LaTi1-xO3
- Crystal structure and thermal expansion of β-RbB5O8 from powder diffraction data
- Potassium lithium carbonate, KLiCO3: single-crystal X-ray structure analysis and thermal expansion
- The crystal structures of NaNO3 at 100 K, 120 K and 563 K
- Powder Rietveld refinement of armstrongite, CaZr[Si6O15]·3H2O
- Molecular structures of two indole alkaloids, evodiamine and rutecarpine, from evodia fruit
- Synthesis and properties of N1-(1,2,3,6-tetrahydrophthaloyl)semi- and thiosemicarbazides. II. Chiral N-substituted amides of 1-(3-ethylthio-1,2,4-triazol-5-yl)-4-cyclohexene-2-carboxylic acid
- Books Received
Articles in the same Issue
- Temperature related structural variation of the hydrous components in gypsum
- Modified hydrothermal diamond anvil cells for XAFS analyses of elements with low energy absorption edges in aqueous solutions at sub- and supercritical conditions
- Edgeworth series expansion of the truncated Cauchy function and its effectiveness in the study of atomic heterogeneity
- Intergrowth polytypoids as modulated structures: the example of the cation deficient oxides LaTi1-xO3
- Crystal structure and thermal expansion of β-RbB5O8 from powder diffraction data
- Potassium lithium carbonate, KLiCO3: single-crystal X-ray structure analysis and thermal expansion
- The crystal structures of NaNO3 at 100 K, 120 K and 563 K
- Powder Rietveld refinement of armstrongite, CaZr[Si6O15]·3H2O
- Molecular structures of two indole alkaloids, evodiamine and rutecarpine, from evodia fruit
- Synthesis and properties of N1-(1,2,3,6-tetrahydrophthaloyl)semi- and thiosemicarbazides. II. Chiral N-substituted amides of 1-(3-ethylthio-1,2,4-triazol-5-yl)-4-cyclohexene-2-carboxylic acid
- Books Received
