Thin Film Stoichiometry Determination by High Temperature Microbalance Technique

2002 ◽  
Vol 756 ◽  
Author(s):  
H. Fritze ◽  
H. Seh ◽  
O. Schneider ◽  
H. L. Tuller ◽  
G. Borchardt
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
High Temperature ◽  
Electrical Impedance ◽  
Ceramic Materials ◽  
Small Mass ◽  
Transport Processes ◽  
Electrical Impedance Spectroscopy ◽  
Mechanical Stiffness ◽  
Resonance Behavior

ABSTRACTThe in-situ determination of small mass changes of thin films became feasible with the availability of high temperature stable microbalances. With this technique, changes of the mechanical properties of thin films deposited on piezoelectric resonators are investigated at temperatures above 500 °C by monitoring the resonance behavior of the resonators. The results are valuable for fundamental understanding of the ionic and electronic transport processes in ceramic materials and for applications such as high temperature gas sensors.This work correlates the electrical and the mechanical properties of TiO2-x at different oxygen partial pressures. TiO2-x films are deposited onto high temperature resonators by laser ablation and characterized by the high temperature microbalance technique as well as electrical impedance spectroscopy at 600 °C.The oxygen partial pressure dependent resonance behavior cannot be attributed solely to mass changes of the TiO2-x film. Changes of the film's mechanical stiffness have to be taken into consideration to explain the resonance behavior. The simultaneous electrical impedance measurements indicate a n-type conduction behavior of the TiO2-x films.

scholarly journals High Temperature Thermo-Mechanical Properties of Praseodymium Doped Ceria Thin Films Measured Two Ways

2022 ◽  
Author(s):  
Yuxi Ma ◽  
Quan Zhou ◽  
Jason D. Nicholas
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
High Temperature ◽  
Temperature Dependence ◽  
Internal Stress ◽  
Expansion Coefficient ◽  
Mechanical Stability ◽  
Doped Ceria ◽  
Stress Strain ◽  
Chemical Expansion

The temperature dependence of a Mixed Ionic Electronic Conducting (MIEC) material’s thermo-chemical expansion coefficient, biaxial modulus, and/or Young’s modulus are crucial in determining the internal stress, strain, and/or mechanical stability...

Silicon carbide fibers and whiskers for ceramic matrix composites (review)

2021 ◽  
Vol 87 (8) ◽  
pp. 51-63
Author(s):  
A. M. Shestakov
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
High Temperature ◽  
Composite Materials ◽  
Ceramic Matrix Composites ◽  
Ceramic Materials ◽  
Ceramic Composites ◽  
Silicon Compounds ◽  
Reinforcing Fillers ◽  
Operating Temperatures

An increase the operating temperature range of structural elements and aircraft assemblies is one of the main goals in developing advanced and new models of aerospace equipment to improve their technical characteristics. The most heat-loaded aircraft structures, such as a combustion chamber, high-pressure turbine segments, nozzle flaps with a controlled thrust vector, must have a long service life under conditions of high temperatures, an oxidizing environment, fuel combustion products, and variable mechanical and thermal loads. At the same time, modern Ti and Ni-based superalloys have reached the limits of their operating temperatures. The leading world aircraft manufacturers — General Electric (USA), Rolls-Royce High Temperature Composite Inc. (USA), Snecma Propulsion Solide (France) — actively conduct fundamental research in developing ceramic materials with high (1300 – 1600°C) and ultrahigh (2000 – 2500°C) operating temperatures. However, ceramic materials have a number of shortcomings attributed to the high brittleness and low crack resistance of monolithic ceramics. Moreover, manufacturing of complex configuration and large-sized ceramic parts faces serious difficulties. Nowadays, ceramic composite materials with a high-temperature matrix (e.g., based on ZrC-SiC) and reinforcing filler, an inorganic fiber, (e.g., silicon carbide) appeared most promising for operating temperatures above 1200°C and exhibited enhanced energy efficiency. Ceramic fibers based on silicon compounds possess excellent mechanical properties: the tensile strength more than 2 GPa, modulus of elasticity more than 200 GPa, and thermal resistance at a temperature above 800°C, thus making them an essential reinforcing component in metal and ceramic composites. This review is devoted to silicon carbide core fibers obtained by chemical vapor deposition of silicon carbide onto a tungsten or carbon core, which makes it possible to obtain fibers a 100 – 150 μm in diameter to be used in composites with a metal matrix. The coreless SiC-fibers with a diameter of 10 – 20 μm obtained by molding a polymer precursor from a melt and used mainly in ceramic composites are also considered. A comparative analysis of the phase composition, physical and mechanical properties and thermal-oxidative resistance of fibers obtained by different methods is presented. Whiskers (filamentary crystals) are also considered as reinforcing fillers for composite materials along with their properties and methods of production. The prospects of using different fibers and whiskers as reinforcing fillers for composites are discussed.

scholarly journals Spectroscopic and electrical signatures of acceptor states in solution processed Cu2ZnSn(S,Se)4 solar cells

2017 ◽  
Vol 5 (48) ◽  
pp. 12720-12727 ◽  
Author(s):  
Devendra Tiwari ◽  
Ekaterina Skidchenko ◽  
Jake W. Bowers ◽  
Michael V. Yakushev ◽  
Robert W. Martin ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Impedance Spectroscopy ◽  
Electrical Impedance ◽  
Variable Temperature ◽  
Electrical Impedance Spectroscopy ◽  
Solution Processed

The nature and dynamics of acceptor states in solution-processed Cu2ZnSn(S,Se)4 (CZTSSe) thin films are investigated by variable temperature photoluminescence (PL) and electrical impedance spectroscopy.

Investigation of the influence of the vanadium content on the high temperature tribo-mechanical properties of DC magnetron sputtered AlCrVN thin films

2017 ◽  
Vol 328 ◽  
pp. 172-181 ◽  
Author(s):  
Wolfgang Tillmann ◽  
David Kokalj ◽  
Dominic Stangier ◽  
Michael Paulus ◽  
Christian Sternemann ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
High Temperature ◽  
Vanadium Content
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