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Calorimetric study of a phase transition in D2O ice Ih doped with KOD: Ice XI
Institution:1. Universidade Federal do Maranhão, CCSST, Imperatriz, MA, 65900-410, Brazil;2. Universidade Federal do Sul e Sudeste do Pará, ICEN, Marabá, PA 68505-080, Brazil;3. Instituto Federal do Tocantins, Araguaína, TO, 77.826-170, Brazil;1. Shinshu University, Faculty of Textile Science and Technology, Division of Applied Biology, 3-15-1, Tokida, Ueda 386-8567, Japan;2. Shinshu University, Division of Instrumental Analysis (Ueda branch), Research Center for Human and Environmental Sciences, 3-15-1, Tokida, Ueda 386-8567, Japan;3. Shinshu University, Faculty of Textile Science and Technology, Division of Chemistry and Materials, 3-15-1, Tokida, Ueda 386-8567, Japan;1. Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes ‘Organométalliques, Matériaux et Catalyse’, Campus de Beaulieu, 35042 Rennes, France;2. Laboratoire d’hydrométallurgie et chimie inorganique moléculaire, Faculté de Chimie, U.S.T.H.B. Bab-Ezzouar, Alger, Algeria;3. Département de chimie, UMMTO, BP 17 RP, 15000 Tizi-Ouzou, Algeria;1. Professor, Department of Civil Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;2. Ministry of Land, Infrastructure, Transport and Tourism, Japan;3. Researcher, Department of Civil Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;1. Department of Chemistry, University of Louisiana at Lafayette, Lafayette, LA 70504, United States;2. Department of Mechanical Engineering, Mississippi State University, Mississippi State, MS 39762, United States;3. The Center for Advanced Computer Studies, University of Louisiana at Lafayette, Lafayette, LA 70504, United States
Abstract:D2O ice Ih doped with KOD was found by calorimetry to undergo a phase transition at 76 K. The enthalpy and entropy of the phase transition depended in their magnitude on the annealing of the sample. The largest values obtained were ΔH = 155 J mol−1 and δS = 2.06 J K−1 mol−1. The phase transition removed 64% of the residual entropy. Mechanisms of the isotope effect were discussed to explain the difference in the transition temperatures of the D2O and H2O ices and compared with the experiment. The pressure coefficient of the transition temperature was calculated by the use of the Clapeyron-Clausius equation and recent data on the molar volume of the new phase. The name ice XI is proposed to designate the ordered phase of ice Ih.
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