The Experts below are selected from a list of 1032 Experts worldwide ranked by ideXlab platform
Wolfgang W Schmahl - One of the best experts on this subject based on the ideXlab platform.
-
landau free energy and order parameter behaviour of theα βphase transition in cristobalite
Zeitschrift Fur Kristallographie, 1992Co-Authors: Wolfgang W Schmahl, I P Swainson, Martin T Dove, A GraemebarberAbstract:Cristobalite, the high-temperature phase of silica, SiO2, stable between1743 K and the melting point at 1898 K, exists in metastable form atlower temperatures. The cristobalite tetrahedral framework distorts fromcubic Fa3mBAR to tetragonal P4(1)2(1)2 symmetry at a strongly firstorder phase transition near 533 K with a latent heat of 1256 Jmol-1. Thetransition involves a large (5\%) volume discontinuity such that singlecrystals tend to shatter. We measured the thermal evolution of thestructural order parameter of the alpha/beta-cristobalite transition andthe unit cell strain by neutron time-of-flight and X-Ray Guinier powderdiffractometry. The system is well described by a single-domain approachwith only one active order parameter component, and there is no evidencefor a coupling mechanism between the six possible order parametercomponents. The transition follows a Landau free energy expansion up to
I P Swainson - One of the best experts on this subject based on the ideXlab platform.
-
landau free energy and order parameter behaviour of theα βphase transition in cristobalite
Zeitschrift Fur Kristallographie, 1992Co-Authors: Wolfgang W Schmahl, I P Swainson, Martin T Dove, A GraemebarberAbstract:Cristobalite, the high-temperature phase of silica, SiO2, stable between1743 K and the melting point at 1898 K, exists in metastable form atlower temperatures. The cristobalite tetrahedral framework distorts fromcubic Fa3mBAR to tetragonal P4(1)2(1)2 symmetry at a strongly firstorder phase transition near 533 K with a latent heat of 1256 Jmol-1. Thetransition involves a large (5\%) volume discontinuity such that singlecrystals tend to shatter. We measured the thermal evolution of thestructural order parameter of the alpha/beta-cristobalite transition andthe unit cell strain by neutron time-of-flight and X-Ray Guinier powderdiffractometry. The system is well described by a single-domain approachwith only one active order parameter component, and there is no evidencefor a coupling mechanism between the six possible order parametercomponents. The transition follows a Landau free energy expansion up to
Martin T Dove - One of the best experts on this subject based on the ideXlab platform.
-
landau free energy and order parameter behaviour of theα βphase transition in cristobalite
Zeitschrift Fur Kristallographie, 1992Co-Authors: Wolfgang W Schmahl, I P Swainson, Martin T Dove, A GraemebarberAbstract:Cristobalite, the high-temperature phase of silica, SiO2, stable between1743 K and the melting point at 1898 K, exists in metastable form atlower temperatures. The cristobalite tetrahedral framework distorts fromcubic Fa3mBAR to tetragonal P4(1)2(1)2 symmetry at a strongly firstorder phase transition near 533 K with a latent heat of 1256 Jmol-1. Thetransition involves a large (5\%) volume discontinuity such that singlecrystals tend to shatter. We measured the thermal evolution of thestructural order parameter of the alpha/beta-cristobalite transition andthe unit cell strain by neutron time-of-flight and X-Ray Guinier powderdiffractometry. The system is well described by a single-domain approachwith only one active order parameter component, and there is no evidencefor a coupling mechanism between the six possible order parametercomponents. The transition follows a Landau free energy expansion up to
A Graemebarber - One of the best experts on this subject based on the ideXlab platform.
-
landau free energy and order parameter behaviour of theα βphase transition in cristobalite
Zeitschrift Fur Kristallographie, 1992Co-Authors: Wolfgang W Schmahl, I P Swainson, Martin T Dove, A GraemebarberAbstract:Cristobalite, the high-temperature phase of silica, SiO2, stable between1743 K and the melting point at 1898 K, exists in metastable form atlower temperatures. The cristobalite tetrahedral framework distorts fromcubic Fa3mBAR to tetragonal P4(1)2(1)2 symmetry at a strongly firstorder phase transition near 533 K with a latent heat of 1256 Jmol-1. Thetransition involves a large (5\%) volume discontinuity such that singlecrystals tend to shatter. We measured the thermal evolution of thestructural order parameter of the alpha/beta-cristobalite transition andthe unit cell strain by neutron time-of-flight and X-Ray Guinier powderdiffractometry. The system is well described by a single-domain approachwith only one active order parameter component, and there is no evidencefor a coupling mechanism between the six possible order parametercomponents. The transition follows a Landau free energy expansion up to
