Structure phase state and physical properties of YbMn1-xFexO3 compositions
К. Г. АбдулвахидовZhengyou LiBashir AbdulvakhidovА. В. СолдатовSalim OtajonovRavshan ErgashevDilshod YuldashaliyevBohodir KarimovА. В. НазаренкоPavel PlyakaSvetlana ShapovalovaM. A. VitchenkoI. V. MardasovaElza UbushaevaEvgeniy Sitalo
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Orthorhombic crystal system
Atmospheric temperature range
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Orthorhombic crystal system
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Orthorhombic crystal system
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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
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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
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Atmospheric temperature range
Cole–Cole equation
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Orthorhombic crystal system
Monoclinic crystal system
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Orthorhombic crystal system
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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.
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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.
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Rietveld Refinement
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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.
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