Precision Measurements of Crystals of the Alkali Halides

The structure of tussah silk fibroin (with a note on the structure of β-poly-L-alanine)

“…In confirmation of this spacing, the lattice parameter a 0 was obtained from a least-squares treatment of all of the observed powder lines; it was found to be 4.6327 A with a probable error of 0.0003 A, in satisfactory agreement with the value 4.620±0-004 kX. (-4.629±0.004 A) obtained by Davey (1923). Accordingly, the fiber-axis identity distance of Tussah silk is 6.949 A, with an estimated limit of error of about 0.010 A.…”

Bridgman‐Stockbarger growth and X‐ray photoelectron spectroscopy study of LiY1‐xEuxF4 crystals

“…For the highly polycrystalline zone of LiYF 4 (Fig. 2b), one weak additional line was observed; the diffraction pattern of the eutectic contained strong lines corresponding to LiF [21] and LiYF 4 [1,2] but the additional line observed for the polycrystalline zone disappeared. This line corresponds probably to YF 3 [22], because other possible assignments, to an yttrium oxyfluoride phase [23,24] or to Y 2 O 3 [17], seem very unlikely as in such a case the latter compounds should appear also in the eutectic, which is not the case.…”

Thermal Expansion of Caesium Halides with the CsCl Structure

“…It also includes their Debye temperatures (0o) (Reeber, 1974) (Menary et al, 1951;Majumdar & Roy, 1965;Srivastava & Merchant, 1973;Ganesan & Girirajan, 1986a;Davey & Wick, 1921;Davey, 1923;Havighurst, Mack & Blake, 1924;Brock, Oftendel & Probst, 1929;Wagner & Lippert, 1936) for the roomtemperature lattice parameter of CsCI. We chose the lattice parameter at 293 K as 4.11879 fit, which is the average from consistent literature data (Menary et al, 1951;Majumdar & Roy, 1965;Srivastava & Merchant, 1973;Davey & Wick, 1921;Davey, 1923;Brock et al, 1929;Wagner & Lippert, 1936). Since there is a phase transition from body-centered cubic to face-centered cubic at 742 K for CsCI, we only fit the data below the transition temperature.…”

“…2(b) the lattice parameter. The average value (Davey, 1923;Johnson et al, 1955;Pathak & Vasavada, 1970;Srivastava & Merchant, 1973;Ganesan & Girirajan, 1986b) of the lattice parameter at 293 K is determined to be 4.29268 fit. Fig.…”

“…3(b) the lattice parameter. The lattice parameter at 293 K for Csl is chosen as 4.55515 fit, which is the average value of several experiments (Davey, 1923;Rymer & Hambling, 1951;Johnson et al, 1955;Srivastava & Merchant, 1973). Fig.…”