ISSN:0232-1300    

DOI:10.1002/crat.2170270725

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170270726

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170270727

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170270728

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractA resistance‐heated furnace with a good control of temperature gradients is used for the Czochralski growth of precipitate and colour free Bi4Ge3O12(BGO) crystals up to 30 mm in diameter and 80 mm in length from a 45 mm diameter crucible. The quality of the grown crystals is discussed in connection with the growth conditions.Spectrometric tests made on scintillators obtained from BGO crystals are presented. A Monte Carlo program is used in order to compute the full energy peak efficiency of the detector for different energies and geometries. The computed values are compared to the experimental result

ISSN:0232-1300    

DOI:10.1002/crat.2170270702

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractBulk Pbl2crystals up to 20 cm3have been grown from high purity source material in a controlled way using a modified Bridgman‐Stockbarger technique. The cleavage plane (0001) of crystals grown by a natural seed selection in a tipped‐end ampoule is nearly parallel to its axis. On a mica substrate epitaxially grown crystals cleaved perpendicularly to the axis of a specially designed double wall ampo

ISSN:0232-1300    

DOI:10.1002/crat.2170270703

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractThe alternating tetrafluoroethylene‐ethylene (TFE‐E) copolymer has been studied with respect to its crystallization by using differential scanning calorimetry and optical microscopy. The value of the specific surface energy σ at the melt/crystal interface is calculated to be about 2 · 10−3J/m2. The nucleating activity Φ of TiO2particles introduced into TFE‐E copolymer is estimated to be approximately 0.9. The temperature dependence of the nucleation rate and of the linear growth velocity are constructed in the whole region from the melting temperatureTmto the vitrification temperatureTg. The minimum cooling rate for the formation of a crystal‐free TFE‐E copolymer glass is calculated and its value amounts t

ISSN:0232-1300    

DOI:10.1002/crat.2170270704

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractThe adsorption‐desorption limited doping mechanism as suggested by REIFand DUTTONto explain in‐situ doping of epitaxial CVD silicon layer will thoroughly be discussed in comparison to the more general transport‐reaction limited mechanism as originally suggested by SHEPERD, Distinctive and common features will be highilighted and discussed with respect to composite layer g

ISSN:0232-1300    

DOI:10.1002/crat.2170270705

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

ISSN:0232-1300    

DOI:10.1002/crat.2170270706

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY

摘要:

AbstractFaces of three‐dimensional crystals have been divided into edge and corner ones to describe the phenomenon of their disappearance and appearance during the crystal growth. The expression for the critical growth velocity governing the presence of corner faces has been derived and verified and the validity of the previous relationship (SZURGOT, PRYWER) for the edge faces confirmed. Three nearest neighbours control the presence of corner faces and two neighbours decide on the edge face

ISSN:0232-1300    

DOI:10.1002/crat.2170270707

出版商:WILEY‐VCH Verlag    

年代:1992

数据来源: WILEY