摘要:

The specific heat of HIP sintered Si3N4with 3 mol% Y2O3and 3 mol% Al2O3additives was measured at different temperatures ranging from 2 to 10 K, in order to confirm the presence of a glassy phase in the sintered body. The grainboundary glassy phase in the sintered Si3N4was evaluated by specific heat measurements. The difference between the experimental value and the lattice specific heat calculated from the Debye theory confirmed the existence of a glassy phase in sintered Si3N4.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1991.tb07328.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

摘要:

Difficulty in reproducibility of results has often been encountered in the Pb‐doped 2223 Bi─Sr─Ca─Cu─O superconductor compound due to lead vaporization in samples prepared by standard ceramic methods. Various processing parameters such as quenching, slow cooling, or closed vs open sintering containers were found to affect the properties significantly in samples prepared by standard ceramic methods. In contrast, samples prepared by spray‐drying of nitrate solutions were very homogeneous and reproducible because of the rapid and uniform reaction of Pb with other constituents. The magnetic susceptibility and X‐ray diffraction data remained unchanged for spray‐dried samples processed with or without quenching and sintered in open or cl

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1991.tb07329.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1991.tb07330.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1991.tb07331.x

出版商:Blackwell Publishing Ltd    

年代:1991

数据来源: WILEY