Phonons and elasticity of cementite through the Curie temperature

Phonon partial densities of states (pDOS) of ^(57)Fe_3 C were measured from cryogenic temperatures through the Curie transition at 460 K using nuclear resonant inelastic x-ray scattering. The cementite pDOS reveal that low-energy acoustic phonons shift to higher energies (stiffen) with temperature before the magnetic transition. This unexpected stiffening suggests strongly nonharmonic vibrational behavior that impacts the thermodynamics and elastic properties of cementite. Density functional theory calculations reproduced the anomalous stiffening observed experimentally in cementite by accounting for phonon-phonon interactions at finite temperatures. The calculations show that the low-energy acoustic phonon branches with polarizations along the [010] direction are largely responsible for the anomalous thermal stiffening. The effect was further localized to the motions of the Fe_(II) site within the orthorhombic structure, which participates disproportionately in the anomalous phonon stiffening

Phonons and elasticity of cementite through the Curie temperature

Phonon partial densities of states (pDOS) of ^(57)Fe_3 C were measured from cryogenic temperatures through the Curie transition at 460 K using nuclear resonant inelastic x-ray scattering. The cementite pDOS reveal that low-energy acoustic phonons shift to higher energies (stiffen) with temperature before the magnetic transition. This unexpected stiffening suggests strongly nonharmonic vibrational behavior that impacts the thermodynamics and elastic properties of cementite. Density functional theory calculations reproduced the anomalous stiffening observed experimentally in cementite by accounting for phonon-phonon interactions at finite temperatures. The calculations show that the low-energy acoustic phonon branches with polarizations along the [010] direction are largely responsible for the anomalous thermal stiffening. The effect was further localized to the motions of the Fe_(II) site within the orthorhombic structure, which participates disproportionately in the anomalous phonon stiffening

The Vehicle, Spring 1987

Table of Contents Corde\u27s GirlPhil Simpsonpage 3 PhotographStephanie Eihlpage 9 ExcusesBob Zordanipage 10 In Watercolor I Got a 7.5Tina W. Phillipspage 11 PhotographStephanie Eihlpage 12 WaitingJennifer Rardinpage 12 Fish GravyPatrick Peterspage 12 CandaceJohn Fehrmannpage 14 Candace Is the DayJohn Fehrmannpage 15 Candace After EveningJohn Fehrmannpage 16 Then Frustrated with Excitement NowRick Herrimanpage 17 ShoptalkDan Vol Holtenpage 18 Rube\u27s GiftJennifer Rardinpage 19 Epileptic\u27s SongRob Zordanipage 20 Letter Home (On Discovering My Mother Is a Cancer Patient)Patrick Peterspage 21 X Sees Her Coming and GoingPatrick Peterspage 22 PhotographSteve Beamerpage 23 Solstice PoemBob Zordanipage 24 Fractured HarmonyJennifer Rardinpage 25 ConsummationDamon Lee Dillardpage 25 Regression of IdealismRick Herrimanpage 26 The Dignity of the Goldfish, After Paul KleeRodger Patiencepage 28 Boondock HalloweenStuart Albertpage 30 Through Three Sections of HillsPatrick Peterspage 31 Beer For BreakfastJoe Hortonpage 32 ForestGraham Lewispage 35 PhotographStephanie Eihlpage 36 The ShowersPatrick Peterspate 36 HysterectomyJean Chandlerpage 37 PhotographStephanie Eihlpage 37 Shy PaisleyIrene Moralespage 38 March RainStuart Albertpage 40 PhotographSteve Beamerpage 42 PhotographSteve Beamerpage 43 Serenade in Three PartsBob Zordanipage 44 Farewell my gentle morsels of delightDevon Flesorpage 45 Nietzche\u27s GlovesCraig Titleypage 46 The RebelsGretchen R. Lauxpage 46 PhotographStephanie Eihlpage 47 PhotographStephanie Eihlpage 48 PhotographSteve Beamerpage 49 PhotographSteve Beamerpage 50 Barn DeadDan Von Holtenpage 51 Needs, Wants, and the Dangerous Questions of HonestyRick Herrimanpage 52https://thekeep.eiu.edu/vehicle/1050/thumbnail.jp

The Vehicle, Spring 1987

Table of Contents Corde\u27s GirlPhil Simpsonpage 3 PhotographStephanie Eihlpage 9 ExcusesBob Zordanipage 10 In Watercolor I Got a 7.5Tina W. Phillipspage 11 PhotographStephanie Eihlpage 12 WaitingJennifer Rardinpage 12 Fish GravyPatrick Peterspage 12 CandaceJohn Fehrmannpage 14 Candace Is the DayJohn Fehrmannpage 15 Candace After EveningJohn Fehrmannpage 16 Then Frustrated with Excitement NowRick Herrimanpage 17 ShoptalkDan Vol Holtenpage 18 Rube\u27s GiftJennifer Rardinpage 19 Epileptic\u27s SongRob Zordanipage 20 Letter Home (On Discovering My Mother Is a Cancer Patient)Patrick Peterspage 21 X Sees Her Coming and GoingPatrick Peterspage 22 PhotographSteve Beamerpage 23 Solstice PoemBob Zordanipage 24 Fractured HarmonyJennifer Rardinpage 25 ConsummationDamon Lee Dillardpage 25 Regression of IdealismRick Herrimanpage 26 The Dignity of the Goldfish, After Paul KleeRodger Patiencepage 28 Boondock HalloweenStuart Albertpage 30 Through Three Sections of HillsPatrick Peterspage 31 Beer For BreakfastJoe Hortonpage 32 ForestGraham Lewispage 35 PhotographStephanie Eihlpage 36 The ShowersPatrick Peterspate 36 HysterectomyJean Chandlerpage 37 PhotographStephanie Eihlpage 37 Shy PaisleyIrene Moralespage 38 March RainStuart Albertpage 40 PhotographSteve Beamerpage 42 PhotographSteve Beamerpage 43 Serenade in Three PartsBob Zordanipage 44 Farewell my gentle morsels of delightDevon Flesorpage 45 Nietzche\u27s GlovesCraig Titleypage 46 The RebelsGretchen R. Lauxpage 46 PhotographStephanie Eihlpage 47 PhotographStephanie Eihlpage 48 PhotographSteve Beamerpage 49 PhotographSteve Beamerpage 50 Barn DeadDan Von Holtenpage 51 Needs, Wants, and the Dangerous Questions of HonestyRick Herrimanpage 52https://thekeep.eiu.edu/vehicle/1050/thumbnail.jp