ISSN:0232-1300    

DOI:10.1002/crat.2170300123

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractMixed crystals (MgxNi1–x)SeO4· 6 H2O and (MgxCu1–x)SeO4· 5 H2O have been prepared studying the solubility in the MgSeO4–NiSeO4–H2O and MgSeO4–CuSeO4–H2Osystems at 25 °C. It has been shown that the monoclinic structure of MgSeO4· 6 H2O is unstable and undergoes a change into tetragonal structure due to the included nickel ions (about 4 at %). The lattice parameters of (MgxNi 1–x)SeO46 H2O have been calculated. It has been established that the magnesium ions incorporate isodimorphously in the crystal structure of CuSeO4· 5 H2O which could be an indication of the existence of MgSeO4· 5 H2O isostructural with the triclinic CuSeO45 H2O. The distribution coefficients of the salt components between the liquid and solid phases h

ISSN:0232-1300    

DOI:10.1002/crat.2170300102

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170300124

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170300103

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractA discussion of modelling of nucleation and crystal growth kinetics is presented for those mixedsuspension, mixed product removal (MSMPR) crystallizer data available in the literature, for which log population density data appears to be a linear function of crystal size. The modelling crystallization kinetics is done twice – once assuming that the system is obeying McCabe's Δ law, and again when the crystals exhibit growth rate dispersion (GRD). In the latter case the gamma, inverse gamma, log‐normal, beta, Fisher, sum of two gammas, sum of two inverse gammas, sum of two log‐normal, and sum of two constant rates of growth rate dispersion models are used for crystal growth rate estimation. Finally, McCabe's and GRD predictions are compared with the size‐dependent growth rate est

ISSN:0232-1300    

DOI:10.1002/crat.2170300104

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170300126

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractA microprocessor‐controlled Bridgman system was designed and fabricated for the growth of II‐IV‐V2compounds and one of this group of compounds CdGeAs2has been grown using a two‐zone vertical Bridgman systein. The grown crystals have been characterized by X‐ray and Ha

ISSN:0232-1300    

DOI:10.1002/crat.2170300105

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe paper is the first in a series which presents results on the small‐signal diametral response of a Czochralski crystal grown in a resistance furnace to variations in the heating temperature and pulling rate. It is shown that the small‐signal diameter variation is related to the small‐signal bulk melt temperature and pulling rate variation via a second order linear differential equ

ISSN:0232-1300    

DOI:10.1002/crat.2170300106

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

摘要:

AbstractThe authors investigated the effect of small additive amounts of non‐magnetic ions as Na1+, Ca2+, Zr2+, Sb3+and binary or ternary combinations of these ions on some physical properties of the (Li0.5Fe0.5)0.6Zn0.4Fe2O4ferrite used in high frequency. It was found that by the segregation of these additives on the grain boundaries, the grain growth is diminished and much higher sintered densities are obtained in several cases, though not all. We established that additives such as Na2O, CaO, ZrO2enhance the rate of sintering, giving a speedy start to the sintering process. All additives improve the electrical resistivity due to insulating intergranular layers generated by segregation of additive

ISSN:0232-1300    

DOI:10.1002/crat.2170300107

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170300108

出版商:WILEY‐VCH Verlag    

年代:1995

数据来源: WILEY