Crystal Research and Technology

article

Electric field mediated switching of mechanical properties of strontium titanate at room temperature

H. Stöcker, M. Zschornak, T. Leisegang, I. Shakhverdova, more

Crystal Research and Technology > 45 > 1 > 13 - 17

In situ application of an electric field to a SrTiO₃ single crystal plate during nanoindentation led to a reversible change of the mechanical properties at room temperature. When a field of 8 kV/cm was applied, Meyer hardness and Young's modulus decreased by 0.6 GPa and 11 GPa, respectively. An explanation for this behaviour is given by the diffusion of oxygen vacancies resulting in a distortion of...

article

Intermediates and transport phenomena in two‐temperature synthesis of ZnGeP₂

Meng Wang, Chun‐Hui Yang, Zuo‐Tao Lei, Shi‐Xing Xia, more

Crystal Research and Technology > 45 > 1 > 25 - 30

High quality semiconducting ternary compound ZnGeP₂ was synthesized by a modified two‐temperature technique using high purity elemental zinc, germanium and phosphorus as the starting materials. Transport phenomena of zinc and phosphorus vapors and the major reaction intermediates, taking place in ZnGeP₂ formation, were studied by interrupting the synthesis process using quenching technique as well...

article

Preparation and characterization of monodispersed PbSe nanocubes

Xinjun Wang, Ke Li, Yutao Dong, Kai Jiang

Crystal Research and Technology > 45 > 1 > 94 - 98

Monodispersed PbSe nanocubes were synthesized through a simple hydrothermal method by using Pb²⁺‐EDTA complex and Na₂SeSO₃. Composition and morphology of the samples were characterized by means of XRD, TEM and SEM. The gradually releasing of Pb²⁺ from Pb²⁺‐EDTA complex, and the adopting of PVP can adjust the growth rate in <100> and <111> directions of PbSe. Both Pb²⁺‐EDTA complex and...

article

Spontaneous precipitation of calcium silicate hydrate in aqueous solutions

E. Ntafalias, P. G. Koutsoukos

Crystal Research and Technology > 45 > 1 > 39 - 47

Calcium 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 force was...

article

X‐ray diffraction and magnetization studies of BiFeO₃ multiferroic compounds substituted by Sm³⁺, Gd³⁺, Ca²⁺

Mansour Al‐Haj

Crystal Research and Technology > 45 > 1 > 89 - 93

The multiferroic compounds Bi_0.9Sm_0.1FeO₃, Bi_0.9Gd_0.1FeO₃, Bi_0.9Ca_0.1FeO₃, Bi_0.9Sm_0.05Ca_0.05FeO₃, and Bi_0.9Gd_0.05Ca_0.05FeO₃ were prepared by the conventional ceramic method and were characterized by X‐ray diffraction, vibrating sample magnetometry, and differential scanning calorimetry. The compounds were found to have the rhombohedral perovskite‐like structure, accompanied by a small residual Bi₂...

article

Influence of the substrate temperature on the structural, optical, and electrical properties of tin selenide thin films deposited by thermal evaporation method

N. Kumar, V. Sharma, N. Padha, N. M. Shah, more

Crystal Research and Technology > 45 > 1 > 53 - 58

Thin films of tin selenide (SnSe) were deposited on sodalime glass substrates, which were held at different temperatures in the range of 350‐550 K, from the pulverized compound material using thermal evaporation method. The effect of substrate temperature (T_s) on the structural, morphological, optical, and electrical properties of the films were investigated using x‐ray diffraction analysis (XRD),...

article

Temperature dependence of photoluminescence from ordered GaInP₂ epitaxial layers

T. Prutskij, C. Pelosi

Crystal Research and Technology > 45 > 1 > 79 - 84

The temperature behavior of the integrated intensity of photoluminescence (PL) emission from ordered GaInP₂ epitaxial layer was measured at temperatures of 10 ‐ 300 K. Within this temperature range the PL emission is dominated by band‐to‐band radiative recombination. The PL intensity temperature dependence has two regions: at low temperatures it quenches rapidly as the temperature increases, and above...

article

Book Review: Crystal growth under applied fields. By S. Dost and Y. Okano

Arne Cröll

Crystal Research and Technology > 45 > 1 > 104 - 104

article

Contents: Cryst. Res. Technol. 1/2010

Crystal Research and Technology > 45 > 1 > 1 - 5

article

Cover Picture: Cryst. Res. Technol. 1/2010

Crystal Research and Technology > 45 > 1 > n/a - n/a

The cover picture shows a photograph of NaBi(WO₄)₂ crystals grown from a sintered charge in resistive furnace (left), a sintered charge in inductive furnace (middle) and a re‐crystallized charge in inductive furnace (right). (see pages 18–24). (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

article

Optical damage resistance of Mg:Ce:Fe:LiNbO₃ crystals

Zhaopeng Xu, Weihong Bi, Binliang Jiao, Yongzhi Ben, more

Crystal Research and Technology > 45 > 1 > 85 - 88

Mg:Ce:Fe:LiNbO₃ crystals were prepared with fixed concentrations of Fe₂O₃ and CeO₂, and differing concentrations of MgO by the Czochralski technique. Their infrared transmission spectra were measured in order to investigate their defect structures and their optical damage resistance was characterized by the photoinduced birefringence change and transmission facula distortion method. The optical damage...

article

Bandgap characters in GaAs‐based ternary alloys

N. Tit, N. Amrane, A. H. Reshak

Crystal Research and Technology > 45 > 1 > 59 - 69

The existence and origins of the bowing character in the bandgap variation of GaAs‐based ternary alloys are theoretically investigated based on two different computational methods. Within the framework of the virtual crystal approximation (VCA), both the empirical sp³s * tight‐binding (TB) method with, and without, the inclusion of the spin‐orbit coupling effects, and the first‐principle full‐potential...

article

Growth and characterization of L‐valine ‐ a nonlinear optical crystal

S. Moitra, T. Kar

Crystal Research and Technology > 45 > 1 > 70 - 74

The growth of a new nonlinear optical material L‐valine by solvent evaporation method is reported here. To grow good quality crystals pH value of growth solution has been optimized and solubility of L‐valine in different solvents and different pH values was determined. The grown crystals were characterized by IR, single crystal XRD, DTA and TGA, optical transmission and second harmonic generation...

article

Elastic and elasto‐optical properties of Rb_1–x(NH₄)_xH₂AsO₄ mixed crystals studied by Brillouin spectroscopy

A. Trzaskowska, S. Mielcarek, B. Mroz, Z. Trybula

Crystal Research and Technology > 45 > 1 > 48 - 52

The elastic and elasto‐optical properties of Rb_1–x(NH₄)_x H₂AsO₄ mixed crystals were studied by Brillouin spectroscopy at room temperature. The measurements were made on single crystals obtained from the aqueous solution by slow evaporation. The behaviour of bulk phonons propagating in investigated crystals was studied for different polarisations of incident and scattered beam. The components of the...

article

Spin‐Hamiltonian parameters and local lattice structure for Pd(I) center in γ‐irradiated bis(acetylacetonato)palladium(II)

W. L. Feng, T. X. Zeng, T. H. Chen, J. J. Chen

Crystal Research and Technology > 45 > 1 > 75 - 78

This paper reports on a theoretical analysis of spin‐Hamiltonian parameters and local lattice structure for Pd(I) center in γ‐irradiated Pd(II)(acac)₂. Through the crystal‐ and ligand‐field theory, the microscopic spin‐Hamiltonian parameters and local molecular structure for Pd(I) center in the γ‐irradiated Pd(II)(acac)₂ system have been studied by using the high‐order perturbation formulas and Newman's...

article

Influence of essential and non‐essential amino acids on calcium oxalate crystallization

S. T. Sargut, P. Sayan, B. Kıran

Crystal Research and Technology > 45 > 1 > 31 - 38

The investigation on the mechanism of nucleation and growth of crystals at organic‐inorganic interfaces is crucial for understanding biological and physiological calcification processes such as the formation of urinary stones. The effects of five different amino acids on the crystallization of calcium oxalate have been investigated at pH 4.5 and 37 °C in aqueous solutions in the batch type crystallizer...

article

Minerals as advanced materials: Erratum

W. Depmeier

Crystal Research and Technology > 45 > 1 > 6 - 6

article

Twins in CdMnTe single crystals grown by Bridgman method

Jijun Zhang, Wanqi Jie, Linjun Wang, Lijun Luan

Crystal Research and Technology > 45 > 1 > 7 - 12

Cd_1‐xMn_xTe (x =0.2, CdMnTe) crystal was grown by the vertical Bridgman method, which exhibits a pure zincblende structure in the whole ingot. The major defect, twins, which is fatal to CdMnTe crystal, was analyzed with scanning electron microscopy (SEM), X‐ray energy disperse spectroscopy (XEDS) and optic microscopy on the chemical etching surface. The twins observed in the as‐grown ingot are mainly...

article

Low temperature synthesis of thiol‐functionalized CdTe nanoclusters with different tellurium contents

R. Sathyamoorthy, P. Sudhagar, R. Saravana Kumar, T. M. Sathyadevan

Crystal Research and Technology > 45 > 1 > 99 - 103

In recent years thiol‐functionalized cadmium telluride nanoparticles act as a core layers for obtaining high photovoltaic efficiency in conjugated polymer/inorganic nanocrystal solar cells and also provide easy tuning of quantum size effect by varying thiol groups and processing temperature. In this work, thiol functionalized CdTe nanoclusters were prepared for different tellurium concentrations at...

article

Effect of foreign phases on the growth of NaBi(WO₄)₂ crystals

S. G. Singh, M. Tyagi, A. K. Singh, Sangeeta

Crystal Research and Technology > 45 > 1 > 18 - 24

Single crystals of NaBi(WO₄)₂ (NBW) have been grown by Czochralski technique, employing differently synthesized starting charge and different axial temperature gradients. The causes behind inherent problems related to compositional changes and associated lowering in crystallization temperature have been probed by analyzing XRD and DTA patterns of post growth residual charge. Presence of low melting...

INFONA - science communication portal

Crystal Research and Technology

Electric field mediated switching of mechanical properties of strontium titanate at room temperature

Intermediates and transport phenomena in two‐temperature synthesis of ZnGeP₂

Preparation and characterization of monodispersed PbSe nanocubes

Spontaneous precipitation of calcium silicate hydrate in aqueous solutions

X‐ray diffraction and magnetization studies of BiFeO₃ multiferroic compounds substituted by Sm³⁺, Gd³⁺, Ca²⁺

Influence of the substrate temperature on the structural, optical, and electrical properties of tin selenide thin films deposited by thermal evaporation method

Temperature dependence of photoluminescence from ordered GaInP₂ epitaxial layers

Book Review: Crystal growth under applied fields. By S. Dost and Y. Okano

Contents: Cryst. Res. Technol. 1/2010

Cover Picture: Cryst. Res. Technol. 1/2010

Optical damage resistance of Mg:Ce:Fe:LiNbO₃ crystals

Bandgap characters in GaAs‐based ternary alloys

Growth and characterization of L‐valine ‐ a nonlinear optical crystal

Elastic and elasto‐optical properties of Rb_1–x(NH₄)_xH₂AsO₄ mixed crystals studied by Brillouin spectroscopy

Spin‐Hamiltonian parameters and local lattice structure for Pd(I) center in γ‐irradiated bis(acetylacetonato)palladium(II)

Influence of essential and non‐essential amino acids on calcium oxalate crystallization

Minerals as advanced materials: Erratum

Twins in CdMnTe single crystals grown by Bridgman method

Low temperature synthesis of thiol‐functionalized CdTe nanoclusters with different tellurium contents

Effect of foreign phases on the growth of NaBi(WO₄)₂ crystals

Filter options

Publication date

Volume

Keywords

INFONA - science communication portal

Crystal Research and Technology

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Volume

Keywords

Reporting an error / abuse

Sending the report failed

Accessibility options