high pressure dta

High-pressure differential thermal analysis (HP-DTA)

HIGH-PRESSURE DIFFERENTIAL THERMAL ANALYSIS (HP-DTA) I. Dehydration reactions at elevated pressures in phyllosilicates S. Guggenheim and A. F. Koster van Groos* DEPARTMENT OF GEOLOGICAL SCIENCES, UNIVERSITY OF ILLINOIS AT CHICAGO CHICAGO, ILLINOIS 60680 U.S.A. (Received March 17, 1992)Web

Formation of twelve-fold iodine coordination at high pressure

The high pressure and the presence of N 6 rings reduce the energy level of the 5d orbital of iodine, making them part of the valence orbital. Highly symmetrical covalent bonding networks contribute to the formation of twelve-fold iodine hypercoordination. Moreover, a halogen element with a lower atomic number has a weaker propensity for …Web

High-pressure differential thermal analysis (HP-DTA)

High-pressure differential thermal analysis results are used to describe dehydroxylation reactions for the clay materials of kaolinite, Na-rich montmorillonite, and K-, Ca-, and Mg …Web

new differential thermal analysis setup for measuring high …

The first high pressure DTA experiments were carried out in the 1960s by Newton and co-workers [8], Kennedy and Newton [9], and Kennedy and co-workers [10]. Their assembly was tested up to 5GPa in aWeb

The Copper-Selenium System at Temperatures to 850 K and …

The overall enthalpy change is 6.4 f 2 kJ mol-'. The maximum in the DTA signal for this transition decreases slowly with increasing pressure at < 1 K kbar-'. The signal disappears above 42 kbar, presumably due to the formation of a high pressure modification.Web

High-pressure differential thermal analysis measurements of the …

The highest pressure experimental study of lithium melting (up to 8 GPa, conducted more than 40 years ago) employed differential thermal analysis (DTA) in a piston–cylinder apparatus [8]. In this study, we have extended the melting curve to 15 GPa using DTA in a multianvil press.Web

A new differential thermal analysis setup for measuring high pressure

High pressure DTA setup in the Conac 40 cell: (a) crucibles, sample holder and thermocouples, and (b) general assembly. replaced by two crucibles (respectively, for the sample and the reference) placed in a boron nitride support. This symmetrical configuration should limit the effects of thermal and pressure gradients, contrary to the vertical ...Web

(PDF) High-pressure DTA study of the upper three-phase region in …

High-pressure DTA study of the upper three-phase region in the system Na2CO3-H2O Authors: August Koster van Groos University of Illinois at Chicago Abstract and Figures The join Na2CO3-H2O was...Web

Quantitative differential thermal analysis under high pressures

Abstract. A high pressure differential thermal analysis (DTA) apparatus is described which is capable of operation in the pressure range up to 500 MPa and at …Web

A high pressure differential thermal analysis apparatus

Prospects for high-pressure DTA are also discussed. The development of thermal analysis instrumentation 1955-1985. 1986, Thermochimica Acta. Show abstract. …Web

new differential thermal analysis setup for measuring high …

High Pressure Research 379 3.2. Melting and freezing points of germanium at 1.2GPa An example of DTA curve at 1.2GPa for pure germanium is presented in Figure 3.An increasingWeb

Quantitative differential thermal analysis under high pressures

Device for high-pressure differential thermal analysis for liquid samples. The simple high‐pressure DTA cell that can be used for liquid samples was constructed. The …Web

High-Pressure Single-Crystal Structures of 3D Lead-Halide Hybrid

Pressure-temp. phase relations of CH3NH3PbX3 (X = Cl, Br, I) crystals were studied by using a high pressure DTA app. in the range between 0.1 Pa and 200 MPa. A triple point was found in each compd. below 100 MPa. By pressurization, the low pressure phase disappeared at the triple point in the chloride and bromide while a new high …Web

Quantitative differential thermal analysis under high pressures

A high pressure differential thermal analysis (DTA) apparatus is described which is capable of operation in the pressure range up to 500 MPa and at temperatures from 25 to 300°C. The requirements for quantitative DTA are examined.Web

High-pressure DTA (differential thermal analysis) study of the …

@article{osti_6241381, title = {High-pressure DTA (differential thermal analysis) study of the upper three-phase region in the system Na sub 2 CO sub 3 -H sub 2 O}, author = {Koster van Groos, A F}, abstractNote = {The join Na{sub 2}CO{sub 3}-H{sub 2}O was investigated at 100-925C and 0.4-3.7 kbar, using high-pressure differential thermal …Web

Thermal desulfurization of pyrite: An in situ high-T neutron

To study thermal desulfurization of pyrite (FeS 2), we conducted in situ neutron diffraction experiments in the temperature range 298–1073 K.On heating, pyrite remained stable up to 773 K, at which it started to decompose into pyrrhotite (Fe 1− x S) and S 2 gas. Rietveld analysis of the neutron data from 298 to 773 K allowed determination of the …Web

Volume 75 Issue 5-6 | American Mineralogist | GeoScienceWorld

View article titled, A high-temperature study of the low-high leucite phase transition using the transmission electron microscope. Open the PDF for in another window. ... High-pressure DTA study of the upper three-phase region in the system Na 2 CO 3-H 2 O. A. F. Koster van Groos. AbstractWeb

Differential thermal analysis study of phase segregation of Ti

The in situ high-pressure DTA were carried out in a large-volume cubic-type multi-anvil high-pressure apparatus. Since the six anvils of our cubic press are electrical-insulated mutually, a Multi-Channel Data Recorder could monitor sample temperature and reference temperature simultaneously and separately [7].So it was convenient to develop …Web

(PDF) High-pressure DTA study of the upper three-phase region …

High-pressure DTA study of the upper three-phase region in the system Na2CO3-H2O Authors: August Koster van Groos University of Illinois at Chicago …Web

A high pressure differential thermal analysis apparatus

Prospects for high-pressure DTA are also discussed. The development of thermal analysis instrumentation 1955-1985. 1986, Thermochimica Acta. Show abstract. The development of thermal analysis instruments in the author's laboratory from 1955 to 1985 is discussed. In the 1955–1965 period, instruments were developed to solve a specific …Web

High-pressure differential thermal analysis measurements of the …

The highest pressure experimental study of lithium melting (up to 8 GPa, conducted more than 40 years ago) employed differential thermal analysis (DTA) in a …Web

(PDF) High-pressure DTA study of the upper three-phase region in …

High-pressure DTA curves for experiments with 90 wto/o NarCO, and 10 wto/o HrO at pressures to 3 kbar. A signal of 50 pV represents a differential temperature of approximately 5 "C.Web

Quantitative differential thermal analysis under high pressures

Abstract. A high pressure differential thermal analysis (DTA) apparatus is described which is capable of operation in the pressure range up to 500 MPa and at temperatures from 25 to 300°C. The requirements for quantitative DTA are examined.Web

High‐pressure DTA of poly(butylene terephthalate), …

Abstract Pressure effect on the melting behavior of poly(butylene terephthalate) (PBT) and poly(hexamethylene terephthalate) (PHT) was studied by high-pressure DTA ...Web

High-pressure differential thermal analysis (HP-DTA)

High-pressure differential thermal analysis results are used to describe dehydroxylation reactions for the clay materials of kaolinite, Na-rich montmorillonite, and K-, Ca-, and Mg-exchanged montmorillonite. Sealed capsules may be used to contain fluids and it is possible to evaluate the role of H 2 O in these reactions.Web

High-pressure differential thermal analysis (HP-DTA)

HIGH-PRESSURE DIFFERENTIAL THERMAL ANALYSIS (HP-DTA) I. Dehydration reactions at elevated pressures in phyllosilicates S. Guggenheim and A. F. Koster van …Web

High-pressure differential thermal analysis (HP-DTA) of the

Abstract. High-pressure differential thermal analysis (HP-DTA) of the dehydroxylation of a Na-rich montmorillonite and of the same montmorillonite after being K-exchanged was …Web

new differential thermal analysis setup for measuring high …

In this study, we propose a new high pressure DTA setup dedicated to a toroidal-type anvil system, using a solid pressure-transmitting medium. The prototype is based on a standard DTAWeb

(PDF) Dehydroxylation of kaolinite

High pressure DTA experiments show that the dehydroxylation of kaolinite in dry runs with P(Total) = P(argon) proceeds at 525/sup 0/C and 1 bar to 627/sup 0/C at 30.5 bars. Further increase in ...Web

High-pressure differential thermal analysis (HP-DTA)

Abstract. High-pressure differential thermal analysis results are used to describe dehydration reactions for the clay-like materials of Na-rich montmorillonite, K-, Ca-, and Mg-exchanged montmorillonite, kerolite, and a high-pressure phase resembling talc/mica with excess water. Because sealed capsules may be used to contain fluids, it is ...Web