Crystal Research and Technology
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Investigation on the Growth and Properties of Six Garnet Single Crystals with Large Lattice Constants
Crystal Research and Technology - Tập 56 Số 5 - 2021
AbstractLarge lattice constant Y3Al5O12, Gd3Ga5O12 (GGG), Y3Sc2Ga3O12 (YSGG),
Gd3Sc2Ga3O12, Ca0.4Mg0.25Zr0.65Gd2.6Ga4.1O12 (CaMgZr:GGG), and
Gd1.17Y1.83Sc2Ga3O12 (GYSGG) substrate crystals with 2 in. in diameter are grown
by the Czochralski (Cz) method, their physical, chemical, and optical properties
are analyzed and compared in details. The X‐ray rocking curves (XRCs) illustrate
that the as‐grow...
The Ostwald Rule of Stages
Crystal Research and Technology - Tập 30 Số 4 - Trang 443-449 - 1995
AbstractCrystallization from solutions often starts in such a way that
thermodynamically unstable phases appear first followed by recrystallization to
thermodynamically stable phases. This empirical observation, called as Ostwald's
rule of stages, is explamed here on the basis of structure changes of solutions.
Experiments supporting this explanation have been carried out with aqueous
solutions of...
Crystallization field and rate study for the formation of single phase sodium‐potassium and potassium clinoptilolite
Crystal Research and Technology - Tập 46 Số 4 - Trang 345-350 - 2011
AbstractReproducible synthesis of clinoptilolite as the single crystalline phase
was achieved in the narrow crystallization field at or around the nominal batch
composition of 2.1(Na2O+K2O):Al2O3:10SiO2:110H2O at 140 °C. Clinoptilolites of
high purity were crystallized in the pure sodium or mixed sodium‐potassium
cation systems. Partial replacement of hydroxyl anions with the salts of
carbonates o...
Crystallization field study for the formation of single phase sodium clinoptilolite: Batch composition, seed and temperature effects
Crystal Research and Technology - Tập 44 Số 3 - Trang 293-299 - 2009
AbstractAlthough clinoptilolite is the most abundant zeolite mineral in nature,
its synthesis under laboratory conditions has been difficult. A partial
crystallization field study was done for the synthesis of clinoptilolite based
on a nominal batch composition of 2.1Na2O:Al2O3:10Si2O:110H2O to delineate the
limits of composition and temperature within which sodium clinoptilolite can be
produced a...
Overview of GaAs und CdTe Pixel Detectors Using Medipix Electronics
Crystal Research and Technology - Tập 55 Số 9 - 2020
AbstractGaAs and CdTe pixel detectors have been developed over the last few
decades. The applications of these detectors include X‐ and gamma‐ray detectors
working at room temperature. Fundamental properties such as detection efficiency
and noise are determined by the material properties of the sensor material.
Different materials have been evaluated over the years in search of the best
choice for...
Thermally activated deformation of Alpha Zirconium
Crystal Research and Technology - Tập 19 Số 3 - Trang 401-405 - 1984
AbstractThe effect of temperature on the yield stress of polycrystalline
α‐zirconium has been examined at temperatures between 77 and 900 K. A strong
temperature dependence of the yield stress (interrupted in the temperature
ranges 300 to 400 K and 500 to 700 K where the yield stress is independent of
temperature) indicates the occurence of the thermally activated processes during
deformation. The...
Spontaneous precipitation of calcium silicate hydrate in aqueous solutions
Crystal Research and Technology - Tập 45 Số 1 - Trang 39-47 - 2010
AbstractCalcium silicate hydrates (C‐S‐H) are very important not only for their
contribution to the development of cement and concrete properties but also for
use as fillers and in silicate glasses. In the present work, the thermodynamics
and the kinetics of the spontaneous precipitation of C‐S‐H from aqueous
solutions were investigated over the pH range 10‐12 at 25 °C. The thermodynamic
driving f...
Crystallization of AgGaS2 melts enriched with Ag2S and Ga2S3
Crystal Research and Technology - Tập 43 Số 4 - Trang 409-412 - 2008
AbstractIn this work we consider experiments with directed crystallization of
melts with slight deviation from stoichiometric composition of AgGaS2. The
evolution of melt composition was calculated for both experiments using measured
chemical composition of the solid phase. Also the difference in unit cell
parameters and luminescence spectra for AgGaS2 grown from the melts was found.
Both monocrys...
On the morphological instability of the growing crystals (III). Micro‐interferometric investigations of the morphological stability of KDP crystals growing from aqueous solutions
Crystal Research and Technology - Tập 23 Số 9 - Trang 1061-1071 - 1988
AbstractThe paper is aimed at the elucidation of the limits to which the faceted
forms of KDP crystals preserve their stability and beyond which a skeletal
growth from stagnant solutions takes place. In order to avoid the natural
convections the experiments were performed in two‐dimensional cells. On the
basis of quantitative criteria, it has been shown that the kinetic regime of
growth has been r...
Crystal Growth and Physico‐Chemical Properties of Lead Molybdate in the Homogeneity Region
Crystal Research and Technology - Tập 21 Số 4 - Trang 439-448 - 1986
AbstractFrom data of both X‐ray phase analysis and differential thermal
analysis, as well from measurements of the crystal lattice parameters, electric
conductivity and diffusion coefficients of cations in ceramics and single
crystals the width of the homogeneity region of the lead molybdate phase which
lies in the composition range of 49.85–50.50 mole% MoO3, has been determined. It
was also estab...
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