搜索结果: 1-15 共查到“地质学 phase transitions”相关记录15条 . 查询时间(0.215 秒)
Interlayer structure, anion dynamics, and phase transitions in mixed-metal layered hydroxides: Variable temperature 35Cl NMR spectroscopy of hydrotalcite and Ca-aluminate hydrate (hydrocalumite)
Cl -intercalated hydrotalcite Ca-aluminate hydrate Variable temperature
2012/3/31
The Cl NMR spectroscopy of Cl -intercalated hydrotalcite and the Ca-aluminate hydrate, the presence of
hydrocalumite (Friedel°Os salt) demonstrates dynamical behavior of interlayer C
dynamical orde...
Iron sulfides from magnetotactic bacteria: Structure, composition, and phase transitions
Iron sulfides magnetotactic bacteria Structure composition phase transitions
2012/4/1
The top 20 cm of sediments at active cold seeps in Monterey Bay, coastal California,contain framboidal pyrite that occurs as infillings and pseudomorphs of the chambers of the tests of foraminifera an...
Molecular dynamics simulations of phase transitions and melting in perovskite MgSiO3 at mantle pressures
Molecular dynamics simulations phase transitions MgSiO3
2012/4/1
The high pressure phase transitions and melting of the mantle mineral MgSiO3 with the perovskite structure were investigated using molecular dynamics (MD) simulations of a large system of atoms on a p...
Anti-phase boundaries and phase transitions in titanite: An X-ray diffraction study
Anti-phase boundaries phase transitions titanite X-ray diffraction study
2012/4/5
X-raydiffractionrockingcurvesoftitanite,CaTiSiO ,weremeasuredusinganovelhigh-resolutiondiffractometer.ThreeBraggre?ectionswererecordedasafunctionoftemperatureandtheirpro?lesanalyzedintermsofaGaussianB...
Theory of displacive phase transitions in minerals
Theory of displacive phase transitions minerals
2012/4/1
Alattice-dynamicaltreatmentofdisplacivephasetransitionsleadsnaturallytothesoft-
modemodel,inwhichthephase-transitionmechanisminvolvesaphononfrequencythat
fallstozeroatthetransitiontemperature.Thebas...
Memory effects of domain structures during displacive phase transitions: A high-temperature TEM study of quartz and anorthite
Memory effects domain structures displacive phase transitions high-temperature TEM study of quartz anorthite
2012/4/1
Memory effects ass~iated with the Dauphine twins in a quartz and the c-antiphase
domains (c-APDs) in PI anorthite have been investigated by in situ hot-stage transmission
electron microscopy (TEM). ...
Structural behavior, crystal chemistry, and phase transitions in substituted leucite: High-resolution neutron powder diffraction studies
Structural behavior crystal chemistry phase transitions substituted leucite High-resolution neutron powder diffraction studies
2012/4/1
High-resolution neutron powder diffraction was used to study phase transitions in theleucite phases of KAlSi206, RbAlSi20", CsAlSi206, and KFeSi206. Thetemperature-depen-dent structural behavior invol...
Lattice simulation studies of the ferroelastic phase transitions in (Na,K)AlSi3O8 and (Sr,Ca)Al2Si2O8 feldspar solid solutions
Lattice simulation studies ferroelastic phase transitions (Na,K)AlSi3O8 (Sr,Ca)Al2Si2O8 feldspar solid solutions
2012/4/1
Lattice-energy minimization calculations have been performed on the feldspar systems
(Ca,Sr)AI2Si20g and disordered (Na,K)AlSi30g as functions of composition to simulate the
ferroelastic phase trans...
Direct observation of phase transitions in aluminate sodalite, Ca8[Al12O24](CrO4)2
Direct observation phase transitions aluminate sodalite Ca8[Al12O24](CrO4)2
2012/4/9
Transmission electron microscopy (TEM) wasused to study the structural changes that occur in aluminate sodalite, Ca8[AI12024](Cr04)2,whenit is heated withthe electron beam. Initially, a twinned orthor...
Rigid-unit phonon modes and structural phase transitions in framework silicates
Rigid-unit phonon modes phase transitions framework silicates
2012/4/6
Therigid-unit modemodelprovides manynewinsights into the stability and physical properties offramework silicates. In this modelthe Si04and Al04tetrahedra aretreated asverystiff,to a first approximatio...
Microstructures and high-temperature phase transitions in kalsilite
Microstructures high-temperature phase transitions kalsilite
2012/4/5
Adiversity of twinning and exsolution textures has been observed by transmission electron microscopy in natural kalsilite from volcanic and metamorphic rocks (Mount Nyiragongo, Zaire; Alban Hills, Ita...
In situ 29Si MAS NMR studies of structural phase transitions of tridymite
situ 29Si MAS NMR studies phase transitions tridymite
2012/4/5
The structural phase transitions ofmonoclinic tridymite that occur at elevated temper-atures, as wellas the structure of the high-temperature modifications, have been studied by 29SiMASNMR. The sample...
Phonon-spectroscopy on alkali-feldspars: Phase transitions and solid solutions
Phonon-spectroscopy alkali-feldspars Phase transitions solid solutions
2012/4/5
Thephonon spectra ofIR-active vibrations in alkalifeldspars havebeensystematically investigated in the spectral range 50-2000 cm-I attemperatures between20and 900K. SampleswithhighdegreesofAl-Siorderd...
Lawsonite-type phase transitions in hennomartinite, SrMn2[Si2O7](OH)2·H2O
Lawsonite-type phase transitions hennomartinite SrMn2[Si2O7](OH)2·H2O
2012/4/5
Phasetransitions similarto those observedatlowtemperatures in lawsonite, CaA12[Si207]-(OHh-H20, wererecorded at -95 and -150°C in hennomartinite, SrMn2[Si207](OHh-H20.Theroom temperature structure oft...
Phase Transitions in Complexes of Nontronite with n-Alkanols
Phase Transitions Complexes Nontronite n-Alkanols
2012/2/15
The basal spacings of long chain n-alkanol complexes of nontronite saturated with Li+, K+ Mg2+, Ca2+, Sr2+ and Ba2+ were measured for temperatures increasing from −70°C up to 130°C. With rising ...