Crystal Structure and Hydration Characteristics of Tricalcium Silicate Doped with Magnesium Oxide

2014 ◽  
Vol 936 ◽  
pp. 1336-1341
Author(s):  
Lin Chen ◽  
Xu Wang ◽  
Xiao Dong Shen ◽  
Su Hua Ma ◽  
Wei Qiang Zhou
Keyword(s):  
Crystal Structure ◽  
Chemical Analysis ◽  
Magnesium Oxide ◽  
Interstitial Atom ◽  
Early Stage ◽  
Tricalcium Silicate ◽  
Hydration Properties ◽  
Formation Kinetic ◽  
Hydration Characteristics ◽  
Substitutional Atom

The research investigates various methods to identify magnesium oxide influences on the crystal structure and hydration properties of tricalcium silicate. The f-CaO content of the clinkers were analyzed by chemical analysis. The complex disordered superstructure of the tricalcium silicate has been studied by a joint XRD, NMR and TEM. The results show that MgO exerts a remarkable influence on the polymorphisms of C3S. Mg is not only substitutional atom but also interstitial atom in the crystal lattice of tricalcium silicate. The HRTEM pattern of C3S doped with MgO is covered by the various irregular lattice. The addition of appropriate amount of MgO in raw meal can change the formation kinetic of C3S, slightly perturb the environment of SiO44- tetrahedral, modify the crystal structure of C3S and affect the hydration activity. Doped with MgO in the raw meal can slow down the hydration rate of alite slightly in early stage.

scholarly journals X-ray diffraction analysis of MTA-Plus, MTA-Angelus and DiaRoot BioAggregate

2014 ◽  
Vol 08 (02) ◽  
pp. 211-215 ◽  
Author(s):  
Yeliz Guven ◽  
Elif Bahar Tuna ◽  
Muzaffer Emin Dincol ◽  
Oya Aktoren
Keyword(s):  
Crystal Structure ◽  
Tantalum Oxide ◽  
Xrd Analysis ◽  
Tricalcium Silicate ◽  
Dicalcium Silicate ◽  
Glass Slide ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
X Ray ◽  
Tricalcium Aluminate

ABSTRACT Objective: The purpose of this study was to investigate and compare the crystalline structures of recently released MTA Plus (MTA-P), MTA Angelus (MTA-A), DiaRoot BioAggregate (BA) by X-ray diffraction (XRD) analysis. Materials and Methods: Phase analysis was carried out on powder and set forms of tested materials. The powder specimens placed into sample holders that were packed with a glass slide and the set samples prepared according to the manufacturer's instructions were placed into molds. The samples after being set for three days at 37°C and 100% humidity in an incubator were mounted onto the XRD machine and phase identification was accomplished using a search-match software program. Results: XRD findings indicated that major constituents of MTA-P were bismuth oxide, portlandite, dicalcium silicate and tricalcium silicate. The crystal structure of MTA-A were similar to those of MTA-P except for the absence of portlandite. Additionally, MTA-A had tricalcium aluminate differing from MTA-P. BA mainly differed from MTA-P and MTA-A by the radiopacifier (tantalum oxide-TO) in its composition. Conclusions: The majority of constituents of the tested materials have shown similarity except for the presence of tricalcium aluminate in MTA-A and the inclusion of TO in BA. In addition, set MTA-P showed a strong peak of portlandite.

Hydration characteristics and hydration products of tricalcium silicate doped with a combination of MgO, Al2O3 and Fe2O3

2008 ◽  
Vol 472 (1-2) ◽  
pp. 64-73 ◽  
Author(s):  
Dietmar Stephan ◽  
Sophie Njooh Dikoundou ◽  
Gabriele Raudaschl-Sieber
Keyword(s):  
Tricalcium Silicate ◽  
Hydration Products ◽  
Hydration Characteristics

Reyerite

1964 ◽  
Vol 33 (265) ◽  
pp. 821-840 ◽  
Author(s):  
R. A. Chalmers ◽  
V. C. Farmer ◽  
R. I. Harker ◽  
S. Kelly ◽  
H. F. W. Taylor
Keyword(s):  
Crystal Structure ◽  
Weight Loss ◽  
Chemical Analysis ◽  
Distinct Species ◽  
Unit Cell ◽  
Molecular Water ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Core Content ◽  
Infra Red

SummaryReyerite from the original locality in Greenland has been re-examined using chemical analysis, infra-red absorption, X-ray powder and single-crystal diffraction, and thermal weight-loss curves. The unit cell is trigonal with a 9·74, c 19·04 Å, and the space group is probably P3¯. The unit cell contents are probably best represented as KCa14(Si24O60)(OH)5.5H2O, with some minor replacements. The molecular water is lost reversibly below 400° C. There are indications that the crystal structure is based on Si6O18 rings resembling those in beryl, but linked into sheets by additional tetrahedra.Reyerite closely resembles truscottite, a mineral found originally in Sumatra, but there are distinct differences, especially in the infra-red pattern. It is not yet certain whether or not the two minerals should be considered as distinct species. Synthetic preparations examined resembled truscottite more closely than reyerite.

Studies on early stage hydration of tricalcium silicate incorporating silica nanoparticles: Part II

2016 ◽  
Vol 102 ◽  
pp. 943-949 ◽  
Author(s):  
L.P. Singh ◽  
S.K. Bhattacharyya ◽  
S.P. Shah ◽  
G. Mishra ◽  
U. Sharma
Keyword(s):  
Silica Nanoparticles ◽  
Early Stage ◽  
Tricalcium Silicate ◽  
Early Stage Hydration

scholarly journals Pharmaceutico analytical study of Shodhita Shilajatu

2020 ◽  
Vol 5 (05) ◽  
pp. 214-219
Author(s):  
Arya Elias ◽  
Pramod C. Baragi ◽  
Kashinath Hadimur ◽  
K. A. Patil ◽  
Khazi Rahimbi
Keyword(s):  
Crystal Structure ◽  
Chemical Analysis ◽  
Analytical Study ◽  
Amorphous Material ◽  
Total Yield ◽  
Xrd Analysis ◽  
The Sun ◽  
Physico Chemical ◽  
Metallic Impurities

Background: Shilajatu or Adrija is one of the Maharasa, which is considered as a wonderful medicine in Ayurveda. It is named as it comes out of the stones heated by the sun in summer in the form of thick blackish exudation having many shades. Since it contain stone, mud, wood, sand and various physical and metallic impurities, Shodhana (Purification) of Shilajatu is a mandatory procedure. It has been used as a prime ingredient in many formulations mainly for Prameha, Sotha, Pandu Roga, Kshaya, Swasa, Pliha Vrudhi, Jwara, Agnimandya, Apasmara, etc. Objectives: Shodhana of Ashudha Shilajatu and Physico chemical analysis of Shodhita Shilajatu. Materials and Methods: Bhringaraja Swarasa for Shodhana of Shilajatu. Results:It took 8 days for completion of Shilajatu Shodhana. XRD Analysis report indicates that the sample Shilajatu was Amorphous material. Conclusion: Total yield of Shodhita Shilajatu was 99.6%. The Sample of Shilajatu was found to be Amorphous material in XRD Analysis hence crystal structure was not identified.

scholarly journals Chromium-rich vanadio-oxy-dravite from the Tzarevskoye uranium–vanadium deposit, Karelia, Russia: a second world-occurrence of Al–Cr–V–oxy-tourmaline

2020 ◽  
pp. 1-8
Author(s):  
Ferdinando Bosi ◽  
Alessandra Altieri ◽  
Fernando Cámara ◽  
Marco E. Ciriotti
Keyword(s):  
Crystal Structure ◽  
Chemical Analysis ◽  
Structure Refinement ◽  
Chemical Information ◽  
Crystal Structure Refinement ◽  
Direct Identification ◽  
Crystalline Complex ◽  
Cation Order ◽  
Lake Onega ◽  
Second World

Abstract A green tourmaline sample from the Tzarevskoye uranium–vanadium deposit, close to the Srednyaya Padma deposit, Lake Onega, Karelia Republic, Russia, has been found to be the second world-occurrence of Cr-rich vanadio-oxy-dravite in addition to the Pereval marble quarry, Sludyanka crystalline complex, Lake Baikal, Russia, type-locality. From the crystal-structure refinement and chemical analysis, the following empirical formula is proposed: X(Na0.96K0.02□0.02)Σ1.00Y(V1.34Al0.68Mg0.93Cu2+0.02Zn0.01Ti0.01)Σ3.00Z(Al3.19Cr1.36V0.03Mg1.42)Σ6.00(TSi6O18)(BBO3)3V(OH)3W[O0.60(OH)0.23F0.17]Σ1.00. Together with the data from the literature, a compositional overview of Al–V–Cr–Fe3+-tourmalines is provided by using [6]Al–V–Cr–Fe3+ diagrams for tourmaline classification. These diagrams further simplify the tourmaline nomenclature as they merge the chemical information over the octahedrally-coordinated sites (Y and Z) by removing the issues of uncertainty associated with cation order–disorder across Y and Z. Results show the direct identification of tourmalines by using the chemical data alone.

Thermal expansion coefficient of BCC defective substitutional alloy AB with interstitial atom C

2019 ◽  
Vol 33 (13) ◽  
pp. 1950165
Author(s):  
Le Thi Cam Tuyen ◽  
Nguyen Quang Hoc ◽  
Bui Duc Tinh ◽  
Pham Thi Minh Hanh ◽  
Tran Dinh Cuong ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Interstitial Atom ◽  
Substitutional Alloy ◽  
Atom Concentration ◽  
Main Metal ◽  
Analytic Expressions ◽  
Substitutional Atom ◽  
Theoretical Results

The analytic expressions for the free energy, the concentration of equilibrium vacancies, the isothermal compressibility, the thermal expansion coefficient and the heat capacities at constant volume and at constant pressure of BCC substitutional alloy AB with interstitial atom C and with vacancy under pressure are derived by the statistical moment method. The theoretical results are applied to the thermal expansion coefficient of alloy FeCrSi in the interval of temperature from 700 K to 1100 K, in the interval of substitutional atom concentration from 0% to 10%, in the interval of interstitial atom concentration from 0% to 5% and in the interval of pressure from 0 GPa to 10 GPa. Our calculated results for main metal Fe are compared with the experimental data.

The crystal-structure and optical properties of matlockite (PbFCl)

1934 ◽  
Vol 23 (146) ◽  
pp. 587-597 ◽  
Author(s):  
F. A. Bannister
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Single Crystal ◽  
British Museum ◽  
Museum Collection ◽  
X Ray ◽  
Fluorine Determination

It has recently been shown by W. Nieuwenkamp that matlockite is identical in chemical composition and crystal-structure with artificial lead fluochloride PbFC1. His conclusion is based upon powder photographs of the two substances and a fluorine determination of a specimen of matlockite from Matlock, Derbyshire. The present work was undertaken primarily to check Nieuwenkamp's interesting results. Access to an exceptionally fine suite of matlockite specimens in the British Museum collection made possible single crystal X-ray measurements, accurate optical determinations, and a new chemical analysis.

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