ISSN:0232-1300    

DOI:10.1002/crat.2170320602

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170320603

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractA setup for in situ observation was developed which makes possible the optical visualization of a solid‐liquid interface during solution growth of semiconductors in an external magnetic field. This setup consisted of an optimized monoellipsoidal mirror furnace, a near‐infrared optical system, and static or rotating electromagnetic facility. The target crystals were GaP, GaAs and C

ISSN:0232-1300    

DOI:10.1002/crat.2170320604

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractThe viscosity of La3Ga5SiO14melt was measured by a fixed‐crucible rotor technique in the range between 1520 and 1596 °C. The melt was found to be Newtonian. The viscosity data ranged between 73 and 97 mPa. s, decreasing with increasing temperature. The activation energy of the viscous flow and the volume of a viscous flow unit estimated from the measured data were 90 kJ/mol and 3 × 10−3nm3, respect

ISSN:0232-1300    

DOI:10.1002/crat.2170320605

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractUsing a simple apparatus the effect of various parameters on encrustations formation was studied. Critical temperature difference and critical time of scaling were introduced as variables characterizing the tendency of the system to form encrustations. These parameters are linked with the metastable zone width of the system.

ISSN:0232-1300    

DOI:10.1002/crat.2170320606

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170320607

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractThe new piezoelectric solid solution aluminium gallium orthophosphate single crystals have been successfully developed for the first time in our laboratory by hydrothermal method. It has been demonstrated that these crystals are homogeneous, and isomorphous with AIPO4and GaPO4. The solid solution crystals Al1‐xGaxPO4are easy to grown and have better optical quality than those of AlPO4crystals under the same conditions. A phase transition temperature Tα‐βis 587 ± 3 °C forx= 0.12. Cell parameters, and elastic, piezoelectric, and dielectric constants ar

ISSN:0232-1300    

DOI:10.1002/crat.2170320608

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractA fluidized bed crystallizer is employed to investigate dissolution rates of potassium chloride in the presence of Fe+2ions at 30 °C. With increasing concentrations of Fe+2ions, an initial decrease of the dissolution rates in the range between 0 and 10 ppm is followed by a gradual increase in the range between 10 and 50 ppm. The addition of Fe+2changes the pH level of the solution to a strongly acidic level and increases the streaming potential of the suspension. The acceleration of the dissolution rate is attributed to the adsorption of protons which increase the charge density of the particle and hence the thickness of the diffusion layer will consequently be decreased

ISSN:0232-1300    

DOI:10.1002/crat.2170320609

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170320610

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY

摘要:

AbstractSingle phase solid solution forms in the Sr1‐xLaSn1‐xCoyO3(x=y) system forx⩽0.05 in the samples prepared by solid state ceramic method. A few compositions were prepared in the Sr1‐3x/2LaxSnO3and SrSn1‐yyCoyO3‐y/2to understand the role of La3+and Co3+in the electrical conduction behaviour of the system. Resistivity increases with incorppration of La3+ions and decreases with doping of Co3+ions. These results have been explained in terms of the defect structures of thes

ISSN:0232-1300    

DOI:10.1002/crat.2170320611

出版商:WILEY‐VCH Verlag    

年代:1997

数据来源: WILEY