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Instruments / Technical Area	Publication Details	Published	Actions
I15-Extreme Conditions	Mechanical behavior and phase change of alkali-silica reaction products under hydrostatic compression Guoqing Geng , Zhenguo Shi , Andreas Leemann , Konstantin Glazyrin , Annette Kleppe , Dominik Daisenberger , Sergey Churakov , Barbara Lothenbach , Erich Wieland , Rainer Daehn Acta Crystallographica Section B Structural Science, Crystal Engineering And Materials 76, 674 - 682 DOI: 10.1107/S205252062000846X Diamond Proposal Number(s): [18643] Show Abstract ▼ Abstract: Alkali-silica reaction (ASR) causes severe degradation of concrete. The mechanical property of the ASR product is fundamental to the multiscale modeling of concrete behavior over the long term. Despite years of study, there is a lack of consensus regarding the structure and elastic modulus of the ASR product. Here, ASR products from both degraded field infrastructures and laboratory synthesis were investigated using high-pressure X-ray diffraction. The results unveiled the multiphase and metastable nature of ASR products from the field. The dominant phase undergoes permanent phase change via collapsing of the interlayer region and in-planar glide of the main layer, under pressure >2 GPa. The bulk moduli of the low- and high-pressure polymorphs are 27±3 and 46±3 GPa, respectively. The laboratory-synthesized sample and the minor phase in the field samples undergo no changes of phase during compression. Their bulk moduli are 35±2 and 76±4 GPa, respectively. The results provide the first atomistic-scale measurement of the mechanical property of crystalline ASR products.	Aug 2020
I15-Extreme Conditions	High-pressure structural systematics in samarium up to 222 GPa S. E. Finnegan , E. J. Pace , C. V. Storm , M. I. Mcmahon , S. G. Macleod , H.-P. Liermann , K. Glazyrin Physical Review B 101 DOI: 10.1103/PhysRevB.101.174109 Diamond Proposal Number(s): [22350, 20311] Show Abstract ▼ Abstract: Angle-dispersive x-ray powder diffraction experiments have been performed on samarium metal up to 222 GPa. Up to 50 GPa we observe the Sm type (hR9) → dhcp (hP4) → fcc (cF4) → distorted fcc (hR24) → hP3 transition sequence reported previously. The structure of the high-pressure phase above 93 GPa, previously reported as having a monoclinic structure with space group C2/m, is found to be orthorhombic, space group Fddd, with eight atoms per unit cell (oF8 in Pearson notation). This structure is the same as that found in Am, Cm, and Cf at high pressures. Analysis of samarium's equation of state reveals marked changes in compressibility in the hP3 and oF8 phases, with the compressibility of the oF8 phase being that of a “regular” metal.	May 2020

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