scholarly journals Monitoring phase transition of aqueous biomass model substrates by high-pressure and high-temperature microfluidics

2019 ◽  
Vol 40 (4) ◽  
pp. 563-570 ◽  
Author(s):  
Renée M. Ripken ◽  
Stefan Schlautmann ◽  
Remco G.P. Sanders ◽  
Johannes G.E. Gardeniers ◽  
Séverine Le Gac
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
High Temperature ◽  
Monitoring Phase

Equation of state and phase transition of antigorite under high pressure and high temperature

2014 ◽  
Vol 228 ◽  
pp. 56-62 ◽  
Author(s):  
Cuiping Yang ◽  
Toru Inoue ◽  
Akihiro Yamada ◽  
Takumi Kikegawa ◽  
Jun-ichi Ando
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
High Temperature ◽  
Equation Of State

Phase Transition and vibration properties of MnCO3 at high pressure and high-temperature by Raman spectroscopy

2018 ◽  
Vol 38 (3) ◽  
pp. 212-223 ◽  
Author(s):  
Chaoshuai Zhao ◽  
Heping Li ◽  
Jianjun Jiang ◽  
Yu He ◽  
Wen Liang
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
High Temperature ◽  
Vibration Properties

scholarly journals The Phase Transition and Dehydration in Epsomite under High Temperature and High Pressure

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 75 ◽  
Author(s):  
Linfei Yang ◽  
Lidong Dai ◽  
Heping Li ◽  
Haiying Hu ◽  
Meiling Hong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
High Pressure ◽  
High Temperature ◽  
Magnesium Sulfate ◽  
Room Temperature ◽  
Diamond Anvil Cell ◽  
Vibrational Modes ◽  
Diamond Anvil ◽  
T Phase

The phase stability of epsomite under a high temperature and high pressure were explored through Raman spectroscopy and electrical conductivity measurements in a diamond anvil cell up to ~623 K and ~12.8 GPa. Our results verified that the epsomite underwent a pressure-induced phase transition at ~5.1 GPa and room temperature, which was well characterized by the change in the pressure dependence of Raman vibrational modes and electrical conductivity. The dehydration process of the epsomite under high pressure was monitored by the variation in the sulfate tetrahedra and hydroxyl modes. At a representative pressure point of ~1.3 GPa, it was found the epsomite (MgSO4·7H2O) started to dehydrate at ~343 K, by forming hexahydrite (MgSO4·6H2O), and then further transformed into magnesium sulfate trihydrate (MgSO4·3H2O) and anhydrous magnesium sulfate (MgSO4) at higher temperatures of 373 and 473 K, respectively. Furthermore, the established P-T phase diagram revealed a positive relationship between the dehydration temperature and the pressure for epsomite.

Monoclinic phase of boron nitride appearing during the hexagonal cubic phase transition at high pressure and high temperature

1996 ◽  
Vol 68 (2) ◽  
pp. 182-184 ◽  
Author(s):  
Shigeo Horiuchi ◽  
Lian‐Long He ◽  
Mitsuko Onoda ◽  
Minoru Akaishi
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
High Temperature ◽  
Boron Nitride ◽  
Monoclinic Phase ◽  
Cubic Phase

High-pressure and high-temperature study of the phase transition in anhydrite

2007 ◽  
Vol 19 (42) ◽  
pp. 425221 ◽  
Author(s):  
Y M Ma ◽  
Q Zhou ◽  
Z He ◽  
F F Li ◽  
K F Yang ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
High Temperature ◽  
Temperature Study ◽  
High Temperature Study

High-pressure investigations of lanthanoid oxoarsenates: I. Single crystals of scheelite-type Ln[AsO4] phases with Ln = La–Nd from monazite-type precursors

2016 ◽  
Vol 71 (5) ◽  
pp. 439-445 ◽  
Author(s):  
Sebastian J. Metzger ◽  
Florian Ledderboge ◽  
Gunter Heymann ◽  
Hubert Huppertz ◽  
Thomas Schleid
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
High Temperature ◽  
Molar Volume ◽  
Single Crystals ◽  
Coordination Number ◽  
Type Structure ◽  
Temperature Conditions ◽  
Type Phase

AbstractTransparent single crystals of the scheelite-type Ln[AsO4] phases with Ln = La–Nd are obtained by the pressure-induced monazite-to-scheelite type phase transition in a Walker-type module under high-pressure and high-temperature conditions of 11 GPa at 1100–1300 °C. Coinciding with this transition, there is an increase in density and a reduction in molar volume of about 4.5 % for the scheelite-type phases (tetragonal, I41/a) for La[AsO4] (a = 516.92(4), c = 1186.1(9) pm), Ce[AsO4] (a = 514.60(1), c = 1175.44(2) pm), Pr[AsO4] (a = 512.63(4), c = 1168.25(9) pm), and Nd[AsO4] (a = 510.46(4), c = 1160.32(11) pm) as compared to the well-known monazite-type phases (monoclinic, P21/n). Surprisingly enough, the scheelite-type oxoarsenates(V) exhibit a lower coordination number for the Ln3+ cations (CN = 8 versus CN = 8 + 1), whereas the isolated tetrahedral [AsO4]3– anions (d(As–O) = 168.9–169.3 pm for the scheelites as compared to d(As–O) = 167.1–169.9 pm for the monazites) remain almost unchanged. So the densification must occur because of the loss of two edge-connections of the involved [LnO8+1]15– polyhedra with the [AsO4]3– tetrahedra in the monazite- resulting in exclusively vertex connected [LnO8]13– and [AsO4]3– units in the scheelite-type structure.

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