Browsing White, Mary Anne by Author "White, Mary Anne"

Now showing items 1-17 of 17

  • Automated, small sample-size adiabatic calorimeter. 

    Van Oort, Michiel J. M., and Mary Anne White. 1987. "Automated, small sample-size adiabatic calorimeter.." Review of Scientific Instruments 58(7): 1239-1241.
    An automated adiabatic calorimeter is described with an internal vol. of 5 cm3, operable at 30-380 K. One of the main advantages of this calorimeter over others in use is the shorter down time during sample changes, due ...

  • A calorimetric investigation of the low-temperature phase transition in sodium hydroxide-d. 

    Reproduced from White, Mary Anne, and Stanley A. Moore. 1986. "A calorimetric investigation of the low-temperature phase transition in sodium hydroxide-d.." Journal of Chemical Physics 85(8): 4629-4632, with the permission of AIP Publishing.
    The heat capacity of NaOD from 20 to 350 K is reported. An anomaly centered at 153.2 ± 0.1 K (?H = 131.1 ± 0.7 J/mol, ?S = 0.864 ± 0.005 J/K.mol) corresponds to the onset of a low-temp. antiferroelec. phase. This ...

  • Heat capacity of gadolinium near the Curie temperature. 

    Bednarz, Grzegorz, D. J. W. Geldart, and Mary Anne White. 1993. "Heat capacity of gadolinium near the Curie temperature.." Physical Review B: Condensed Matter and Materials Physics 47(21): 14247-14259. Copyright © 1993 American Physical Society.
    High-resoln. ac calorimetric data near the Curie point are reported for several single crystals of gadolinium. The crit. temp. and the shape of the heat-capacity curve near Tc both depend on the sample-prepn. procedure, ...

  • Heat capacity, lattice dynamics, and thermodynamic stability of the negative thermal expansion material HfMo2O8 

    Kennedy, Catherine A., Mary Anne White, Angus P. Wilkinson, and Tamas Varga. 2007. "Heat capacity, lattice dynamics, and thermodynamic stability of the negative thermal expansion material HfMo2O8." Physical Review B 75(22): 224302-224302. Copyright © 2007 American Physical Society.
    We explore the lattice dynamics of the negative thermal expansion material, cubic HfMo2O8, through analysis of its heat capacity (measured from 0.5 to 300 K) and its room-temperature Raman spectrum. Its heat capacity is ...

  • High-resolution, high-sensitive ac calorimeter. 

    Bednarz, Grzegorz, Brian Millier, and Mary Anne White. 1992. "High-resolution, high-sensitive ac calorimeter.." Review of Scientific Instruments 63(8): 3944-3952.
    A high-resoln., high-sensitivity, automated ac calorimeter capable of heat capacity measurements of very small samples (m < 20 mg) with a temp. resoln. of a few mK in the ac mode is described. This calorimeter also can be ...

  • Investigation of factors affecting crystallization of cyclopentane clathrate hydrate 

    Reproduced from Whitman, Catherine A., Roman Mysyk, and Mary Anne White. 2008. "Investigation of factors affecting crystallization of cyclopentane clathrate hydrate." Journal of Chemical Physics 129(17): 174502-174502, with the permission of AIP Publishing.
    We report the results of systematic investigations of the influence of thermal history and other factors on crystallization of a model clathrate hydrate (cyclopentane hydrate) studied as water-in-oil and oil-in-water ...

  • Low thermal conductivity of the negative thermal expansion material, HfMo2O8 

    Kennedy, Catherine A., Mary Anne White, Angus P. Wilkinson, and Tamas Varga. 2007. "Low thermal conductivity of the negative thermal expansion material, HfMo2O8." Applied Physics Letters 90(15): 151906-151906.
    The thermal conductivity of the cubic polymorph of hafnium molybdate, HfMo2O8, was determined over the temperature range of 2-400 K. The values of thermal conductivity were low (0.64 +/- 0.15 W m(-1) K-1 at T=300 K for a ...

  • The nature of ammonium ion disorder in ammonium tetrafluoroaluminate, NH4AlF4. 

    Reproduced from White, Mary Anne, and Brian D. Wagner. 1985. "The nature of ammonium ion disorder in ammonium tetrafluoroaluminate, NH4AlF4.." Journal of Chemical Physics 83(11): 5844-5848, with the permission of AIP Publishing.
    To clarify previous conflicting reports concerning the existence of an order-disorder phase transition in NH4AlF4 at T ?150 K, the heat capacity of this compd. was measured from T = 15 to 305 K, by adiabatic calorimetry. ...

  • Phase transitions in M(ClO4)2.6H2O (M = magnesium, zinc). Investigations by adiabatic calorimetry and infrared spectroscopy. 

    Reproduced from White, Mary Anne, and Michael Falk. 1986. "Phase transitions in M(ClO4)2.6H2O (M = magnesium, zinc). Investigations by adiabatic calorimetry and infrared spectroscopy.." Journal of Chemical Physics 84(6): 3484-3490, with the permission of AIP Publishing.
    IR spectra of Mg(ClO4)2.6H2O at 10 K indicate a complex structure contg. at least 16 distinct types of H2O protons. At 107.9 K this structure transforms sharply to a much simpler disordered form (?Strans = 7.754 J K-1 ...

  • Phase transitions in metal perchlorate hydrates: the supposed hydrate-to-pseudohydrate transformations. 

    Reproduced from Falk, Michael, Ping F. Seto, and Mary Anne White. 1984. "Phase transitions in metal perchlorate hydrates: the supposed hydrate-to-pseudohydrate transformations.." Journal of Chemical Physics 81(8): 3752-3753, with the permission of AIP Publishing.
    A polemic. The hydrate-to-pseudohydrate transformations in metal perchlorate hydrates reported by M. B. Patel and H. D. Brist (ibid. 1983, 79, 4489) and Solid State Commun. (48, 139 (1983)) as well as the suggested ...

  • A study of phase transitions in cadmium perchlorate hexahydrate (Cd(ClO4)2.6H2O) by adiabatic calorimetry and infrared spectroscopy. 

    Reproduced from White, Mary Anne, and Michael Falk. 1985. "A study of phase transitions in cadmium perchlorate hexahydrate (Cd(ClO4)2.6H2O) by adiabatic calorimetry and infrared spectroscopy.." Journal of Chemical Physics 83(5): 2467-2474, with the permission of AIP Publishing.
    A calorimetric study of Cd(ClO4)2.6H2O from 20 to 345 K shows 3 phase transformations, at 124.8, 238.45, and 271.62 K. IR spectra indicate that the low-temp. structure (below 124.8 K) contains 1 type of [Cd(OH2)6]2+, of ...

  • Technique for determination of accurate heat capacities of volatile, powdered, or air-sensitive samples using relaxation calorimetry 

    Marriott, Robert A., Maria Stancescu, Catherine A. Kennedy, and Mary Anne White. 2006. "Technique for determination of accurate heat capacities of volatile, powdered, or air-sensitive samples using relaxation calorimetry." Review of Scientific Instruments 77(9): 096108-096108.
    We introduce a four-step technique for the accurate determination of the heat capacity of volatile or air-sensitive samples using relaxation calorimetry. The samples are encapsulated in a hermetically sealed differential ...

  • Temperature dependence of thermal conductivity enhancement in single-walled carbon nanotube/polystyrene composites 

    Jakubinek, Michael B., Mary Anne White, Minfang Mu, and Karen I. Winey. 2010. "Temperature dependence of thermal conductivity enhancement in single-walled carbon nanotube/polystyrene composites." Applied Physics Letters 96(8): 083105-083105.
    The thermal conductivity of single-walled carbon nanotube (SWCNT)/polystyrene composites, prepared by a method known to produce a uniform distribution of SWCNT bundles on the micrometer length scale, was measured in the ...

  • Thermal conductivities of a clathrate with and without guest molecules. 

    Zakrzewski, Marek, and Mary Anne White. 1992. "Thermal conductivities of a clathrate with and without guest molecules.." Physical Review B: Condensed Matter and Materials Physics 45(6): 2809-2817. Copyright © 1992 American Physical Society.
    The thermal conductivities of Dianin's compd. [4-(p-hydroxyphenyl)-2,2,4-trimethylchroman] and its ethanol adduct in the temp. range 20-250 K are reported. This clathrate has the same stable structure both with and without ...

  • Thermal conductivity of (Er1-xYx)(2)Ti2O7 pyrochlore oxide solid solutions 

    Bryan, Craig, Catherine A. Whitman, Michel B. Johnson, John F. Niven, et al. 2012. "Thermal conductivity of (Er1-xYx)(2)Ti2O7 pyrochlore oxide solid solutions." Physical Review B 86(5): 054303-054303. Copyright © 2012 American Physical Society.
    The thermal conductivities of pyrochlore oxide solid solutions of general formula (Er1-xYx)(2)Ti2O7 with 0 <= x <= 1 have been determined for high-quality single crystals aligned along the [110] direction, over the ...

  • A thermodynamic investigation of dynamical disorder in phase II of CBr4. 

    Reproduced from Michalski, Darek, and Mary Anne White. 1995. "A thermodynamic investigation of dynamical disorder in phase II of CBr4.." Journal of Chemical Physics 103(14): 6173-6176, with the permission of AIP Publishing.
    CBr4 is an archetypal example of a pseudospherical mol. that can form an orientationally disordered phase (phase I, 320 K < T < 365 K). At lower temps., phase II is the stable phase; although it must be more ordered than ...

  • X-ray absorption spectroscopy studies of local structure and electronic properties of NaxSi136 (0 < x < 24) clathrates 

    Ritchie, Andrew D., Mark A. MacDonald, Peng Zhang, Mary Anne White, et al. 2010. "X-ray absorption spectroscopy studies of local structure and electronic properties of NaxSi136 (0 < x < 24) clathrates." Physical Review B 82(15): 155207-155207. Copyright © 2010 American Physical Society.
    We have probed both the local structure and the electronic properties of Na-containing type II Si clathrates by x-ray absorption spectroscopy. The near-edge region of the spectrum is particularly sensitive to the local ...