Dimorphic ErAgSn and TmAgSn – High-Pressure and High-Temperature Driven Phase Transitions

2007 ◽  
Vol 633 (10) ◽  
pp. 1551-1555 ◽  
Author(s):  
C. Peter Sebastian ◽  
Gunter Heymann ◽  
Birgit Heying ◽  
Ute Ch. Rodewald ◽  
Hubert Huppertz ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature

Phase transitions of Zn(OH)2 under high pressure and high temperature

2008 ◽  
Vol 148 (9-10) ◽  
pp. 382-385 ◽  
Author(s):  
Keiji Kusaba ◽  
Takumi Kikegawa
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature

Phase transitions and hydrogen bonding in deuterated calcium hydroxide: High-pressure and high-temperature neutron diffraction measurements

2014 ◽  
Vol 218 ◽  
pp. 95-102 ◽  
Author(s):  
Riko Iizuka ◽  
Kazuki Komatsu ◽  
Hiroyuki Kagi ◽  
Takaya Nagai ◽  
Asami Sano-Furukawa ◽  
...  
Keyword(s):  
High Pressure ◽  
Hydrogen Bonding ◽  
Phase Transitions ◽  
High Temperature ◽  
Neutron Diffraction ◽  
Calcium Hydroxide

ChemInform Abstract: Phase Transitions of LiAlO2at High Pressure and High Temperature.

ChemInform ◽  
2008 ◽  
Vol 39 (47) ◽  
Author(s):  
Li Lei ◽  
Duanwei He ◽  
Yongtao Zou ◽  
Wei Zhang ◽  
Zhao Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature

scholarly journals High-Pressure and High-Temperature Phase Transitions in Fe2TiO4 and Mg2TiO4 with Implications for Titanomagnetite Inclusions in Superdeep Diamonds

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 614 ◽  
Author(s):  
Akaogi ◽  
Tajima ◽  
Okano ◽  
Kojitani
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature ◽  
Spin Transition ◽  
Calcium Titanate ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
Spinel Type ◽  
Perovskite Type

Phase transitions of Mg2TiO4 and Fe2TiO4 were examined up to 28 GPa and 1600 °C using a multianvil apparatus. The quenched samples were examined by powder X-ray diffraction. With increasing pressure at high temperature, spinel-type Mg2TiO4 decomposes into MgO and ilmenite-type MgTiO3 which further transforms to perovskite-type MgTiO3. At 21 GPa, the assemblage of MgTiO3 perovskite + MgO changes to 2MgO + TiO2 with baddeleyite (or orthorhombic I)-type structure. Fe2TiO4 undergoes transitions similar to Mg2TiO4 with pressure: spinel-type Fe2TiO4 dissociates into FeO and ilmenite-type FeTiO3 which transforms to perovskite-type FeTiO3. Both of MgTiO3 and FeTiO3 perovskites change to LiNbO3-type phases on release of pressure. In Fe2TiO4, however, perovskite-type FeTiO3 and FeO combine into calcium titanate-type Fe2TiO4 at 15 GPa. The formation of calcium titanate-type Fe2TiO4 at high pressure may be explained by effects of crystal field stabilization and high spin–low spin transition in Fe2+ in the octahedral sites of calcium titanate-type Fe2TiO4. It is inferred from the determined phase relations that some of Fe2TiO4-rich titanomagnetite inclusions in diamonds recently found in São Luiz, Juina, Brazil, may be originally calcium titanate-type Fe2TiO4 at pressure above 15 GPa in the transition zone or lower mantle and transformed to spinel-type in the upper mantle conditions.

High-pressure and high-temperature study of phase transitions in solid germanium

2003 ◽  
Vol 240 (1) ◽  
pp. 19-28 ◽  
Author(s):  
Andrea Di Cicco ◽  
Anna Chiara Frasini ◽  
Marco Minicucci ◽  
Emiliano Principi ◽  
Jean-Paul Itiè ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
High Temperature ◽  
Temperature Study ◽  
High Temperature Study
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