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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...
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...
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...
X-raydiffractionrockingcurvesoftitanite,CaTiSiO ,weremeasuredusinganovelhigh-resolutiondiffractometer.ThreeBraggre?ectionswererecordedasafunctionoftemperatureandtheirpro?lesanalyzedintermsofaGaussianB...
Alattice-dynamicaltreatmentofdisplacivephasetransitionsleadsnaturallytothesoft- modemodel,inwhichthephase-transitionmechanisminvolvesaphononfrequencythat fallstozeroatthetransitiontemperature.Thebas...
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). ...
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-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...
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...
Therigid-unit modemodelprovides manynewinsights into the stability and physical properties offramework silicates. In this modelthe Si04and Al04tetrahedra aretreated asverystiff,to a first approximatio...
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...
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...
Thephonon spectra ofIR-active vibrations in alkalifeldspars havebeensystematically investigated in the spectral range 50-2000 cm-I attemperatures between20and 900K. SampleswithhighdegreesofAl-Siorderd...
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...
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 ...

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