林赛斯 八样品热膨胀仪

D Litzkendorf 等人：镧铝硅酸盐玻璃被动和主动光纤的研究

D Litzkendorf 等人报道了含有和没有Yb2O3的SiO2-Al2O3-La2O3玻璃适合于非线性和光纤激光器的应用。在阶跃折射率光纤中，他们还将给出1060 nm附近的成功超连续谱产生和光纤激光器操作。他们优化了玻璃组合物的热和光学要求，对于高La2O3和Yb2O3浓度和良好的相容性与二氧化硅包层。其中，使用LINSEIS L75 V垂直膨胀仪测量了热膨胀系数。 他们还生产了具有SiO2-Al2O3-La2O3芯和二氧化硅包层的块状样品、非结构化纤维和结构化纤维。

不同操作条件下氧化铝烧结对致密化的影响

tNearly pure -alumina samples produced by uniaxial pressing were flash sintered under electrical fieldsranging from 500 V/cm to 1500 V/cm in experiments at constant heating rate. Sintering temperature sig-nificantly decreased with the applied E-field even down to ≈900?C at 1500 V/cm. The onset temperaturefor flash sintering can be successfully modelled as a function of the applied voltage. The sintering temper-ature is also shown to be strongly affected by the electrode materials used during the treatment: usingsilver or carbon electrodes the sintering temperature is about 300?C lower than when using platinumelectrodes. In addition, the bulk density and porosity of the sintered alumina ceramic correlate stronglywith the imposed current limit.Power dissipation was analysed before and during flash sintering; theactivation energy for conduction was calculated in both cases, indicating that the process is based onionic diffusion phenomena.

Electrical properties and thermal expansion of strontium aluminates

Strontiumaluminateceramics,includingSr3Al2O6,,SrAl2AO4andSr4Al14O25,,synthesizedbyglycine–nitratecombustionandsinteredat1773Kinair,werecharacterizedbythermalanalysis,dilatometryandelec-tricalmeasurementsincontrolledatmospheres.Allstudiedstrontiumaluminatesaresemiconductors……