摘要:

A new phase was prepared from Bi2O3·15 mol% PbF2by heating it at 700°C and then quenching to room temperature. The crystal structure (tetragonal, a =0.765 and c = 1.77 nm, P42/nmc) is related to that of the β‐phase of Bi2O3by a supercell which is 3 times larger in the c direc

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15788.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

The observation that a ruby color is produced in soda‐lime glass doped with SnO2, melted in a PtSAu crucible, and reheated is described and briefly discusse

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15789.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Compacts of monosize TiO2particles and agglomerates of TiO2and γ‐alumina were infiltrated with Spurr's epoxy resin, cured, and ultramicrotomed. Transmission electron microscopy of the thin sections revealed the packing of the TiO2spheres and the structure of the agglomerat

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15790.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

The X‐ray diffraction pattern for potassium‐zirconium phosphate is significantly improved when the material is prepared by the sol‐gel route rather than the powder method. Peaks at high, low, and intermediate angles are presented and compared for the two methods. It is assumed that the more nearly homogeneous mixing of the elements in the sol‐gel process is responsible for the significant improvement in crysta

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15791.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

The effect of nitrogen on the α/β phase conversion of Si3N4‐based, pressure‐sintered bodies was investigated using nitrides and oxides as additives. When stable oxides are used, the α/β conversion is promoted, but when stable nitrides are present, the conversion is inhibited. α‐Sialon can also be made from Si3N4and AIN without the use of oxide additives (e

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15792.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Thermal expansion was measured for skull‐melt‐grown undoped single‐crystal zirconia as well as for crystals containing 2.8 wt% MgO, 4 wt% CaO, and 3 to 20 wt% Y2O3. Samples were cycled in air from room temperature to 1500°C. The partially stabilized samples experienced a phase transformation which was strongly dependent on the composition and phase structures present; fully stabilized materials exhibited uniform behavior throughout the heating/cooling

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15793.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

The transformation‐range viscosity and the glass transformation temperatures were measured for three series of Li2O‐R2O3‐SiO2glasses containing varying alumina‐to‐gallia ratios. The results indicate that these properties vary linearly with the alumina/gallia ratio. These results suggest that these glasses are isostructural and that no “mixed intermediate oxide”

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15794.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

In earlier work it was shown that, by mixing a narrow‐particle‐size‐distribution BaTi03 powder and a wide‐distribution BaTiO3powder, lower slurry viscosities and higher green densities were obtained. In the present work, the particle size distribution of a narrow‐distribution BaTiO3powder was broadened by adding a bismuth borate glass phase. This broadened distribution resulted in lower slurry viscosities and higher tape green

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15795.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Boron carbide compacts sintered between 2220° and 2250° C showed abnormal grain growth that was associated with twinning and microcracking. The twin direction was 〈011〉. The microcracking was linked to thermal expansion anisotropy determined by high‐temperature lattice constant meas

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15796.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Three starting materials, Hf1‐xZrxO2(x =0.24, 0.50, 0.74), were prepared and treated at 600°C and 6 GPa for 30 min. X‐ray powder diffraction patterns of the products indicated only orthorhombic HfO2. The lattice parameters increased linearly as x approached 1 (ZrO2); a continuous solid‐solution series was ob

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1985.tb15797.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY