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Densification of thermodynamically unstable tin monoxide using cold sintering process
摘要： SnO is a thermodynamically unstable phase and undergoes thermal decomposition into SnO2 and Sn at a relatively low temperature when heating under ambient conditions. With the cold sintering process (CSP), SnO can be densified up to 89% of theoretical density within 100 minutes by applying uniaxial pressure of 350 MPa and transient liquid phase. 15-fold BET specific surface area reduction is observed between the ball-milled powder and the cold-sintered pellet, indicating experimental evidence of sintering. The temperature profiles of 70 – 265 °C show densification while maintaining the phase purity. Water and 2 M acetic acid solution are studied as transient liquid phases which promotes dissolution-precipitation on the particle surface and induces crystalline texture. Electrical properties of the cold sintered bulk, notably electrical conductivity and Seebeck coefficient, are measured as a function of temperature.
关键词： densification,thermodynamically unstable,transient liquid phase,cold sintering process,SnO
更新于2025-09-10 09:29:36
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Enhanced stability of higher UV-densified Fiber Bragg Gratings after thermal regeneration
摘要： The stability of the Bragg peak strength during isothermal regeneration of Fiber Bragg Gratings (FBGs) depends on their UV photosensitivity. In low Ge-doped fused silica fibers, lower photosensitivity results in improved thermal stability over time, due to enhanced densification effects occurring during UV-exposure. The contributions of UV-inscription parameters and fiber composition to the power, the spectral width and the wavelength shifts of the transmitted signal through FBGs are examined in detail, indicating how the photosensitivity affects the refractive index, the grating period and the optical coupling inside the fiber core. The changes reported for low- and high-Ge doped fibers are mainly attributed to densification effects induced by UV-imprinting, where stronger compaction is found to significantly improve the long-term stability of FBG sensors after thermal regeneration.
关键词： Photosensitivity,Thermal regeneration process,Fiber Bragg Gratings,Densification
更新于2025-09-09 09:28:46