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    Vibrational relaxation times in pure oxygen have been measured over the temperature range 100°–200°C. An anomalously rapid decrease in the relaxation time is observed for temperatures above 150°C, confirming earlier conclusions based on a comparison of theory and experiment [J. G. Parker, J. Chem. Phys. 41, 1600–1609 (1964)]. This decrease in the vibrational relaxation time may be interpreted as a transition in oxygen from a low-temperature state to a high-temperature state, although the exact nature of the physical mechanism underlying this transition remains obscure.
    Vibrational energy relaxation
    Atmospheric temperature range
    Citations (6)
    Abstract A new four‐layer orthorhombic polytype of potassium ferricyanide, K 3 Fe(CN) 6 , has been determined by single‐crystal X‐ray diffraction supported by powder X‐ray diffraction measurements. It crystallizes in the space group Pbcn with lattice parameters a = 10.3922(7) Å, b = 8.3508(5) Å, c = 26.838(2) Å and Z = 8, indicating a doubled orthorhombic cell along the c direction compared with the previously reported two‐layer orthorhombic polymorph. The structural relationship between these two forms is then discussed with the support of DFT calculations.
    Orthorhombic crystal system
    Potassium ferricyanide
    Lattice (music)
    Powder Diffraction
    Ferricyanide
    Citations (0)
    Optic orientation of orthorhombic Na2SO4(III) was determined as follows: X = c, Y = a and Z = b. The optic axial angle 2 Vc was measured to be ≈ 80°. The crystallographic phase transition of III into hexagonal I is discussed in the light of the optical data as well as our earlier single crystal X-ray work.
    Orthorhombic crystal system
    Crystal (programming language)
    Hexagonal phase
    Both the cubic and orthorhombic ZrW0.8Mo1.2O8 were prepared by precursor-microwave route. The cubic phase belonged to a-ZrW2O8 structure type and the orthorhombic phase was refined with the structural model of LT-ZrMo2O8 by the Rietveld method. The orthorhombic phase belonged to Pmn21 space group and the cell parameters were ao=0.597 1(9) nm, bo=0.730 6(1) nm, co=0.912 7(1) nm, Rp%=9.37; wRp%=11.81. The TEM images were also given. The comparison was made between precursor-heated and precursor-microwave routes. Metastable polymorphic phase was favorably formed by the latter method.
    Orthorhombic crystal system
    Rietveld Refinement
    Metastability
    Citations (0)
    Abstract Orthorhombic LiMnO2 was synthesized using LiOH and γ-MnOOH at 1000 °C in the argon flow by quenching method. X-ray diffraction revealed that the LiMnO2 showed a well-defined orthorhombic phase of a space group with Pmnm. The lattice constants were a = 2.806 Å, b = 5.750 Å, and c = 4.593 Å. The LiMnO2 after grinding delivered 212 mAh/g in the 9th cycle and still delivered 200 mAh/g after 50 cycles at room temperature. The well-defined orthorhombic LiMnO2 by the quenching method exhibited an excellent cycle performance.
    Orthorhombic crystal system
    Lattice constant
    Citations (4)