scholarly journals Effect of the Addition of Different Metal Oxides in Lead Borosilicate Glasses on the Electrical Characteristics of SbSn Composition-Based Thick-Film Resistors

1993 ◽  
Vol 16 (1) ◽  
pp. 7-18
Author(s):  
E. R. Cubellio ◽  
G. N. Natu ◽  
R. N. Karekar ◽  
R. C. Aiyer
Keyword(s):  
Metal Oxides ◽  
Thick Film ◽  
Material Characterization ◽  
Room Temperature ◽  
Negative Temperature ◽  
Lithium Oxide ◽  
Electrical Characteristics ◽  
Borosilicate Glasses ◽  
Sheet Resistivity ◽  
Aging Studies

The paper reports the effect of addition of metal oxides in lead borosilicate glasses on electrical characteristics of SbSn alloy-based thick-film resistors. The Sb and Sn powder (1: 1 by weight) is taken in two quartz tubes separately, vacuum sealed at 10–5Torr and heated in a resistive furnace .at 430℃ and 630℃ respectively. The conventional glass [1] is modified by using different dopants like tungsten oxide, cobalt oxide, lithium oxide, titanium dioxide, venadium pentoxide, chromium oxide, nickel oxide and manganese dioxide. The resistive pastes are formulated with both powders, 5% glass and conventional organic binder. The firing temperature is optimized for eight glasses. The sheet resistivity varies from 1600 Ω/□ to 40 Ω/□ , with negative temperature co-efficient of resistance varying from 2000 ppm/℃ to 800 ppm/℃ respectively. Material characterization is carried out using the XRD technique. Aging studies of resistors at room temperature over the period of two months indicate that these resistors stabilize within 15–20 days.

Direct writing of polymer thick film resistors using a novel laser transfer technique

2001 ◽  
Vol 16 (11) ◽  
pp. 3214-3222 ◽  
Author(s):  
R. Modi ◽  
H. D. Wu ◽  
R. C. Y. Auyeung ◽  
C. M. Gilmore ◽  
D. B. Chrisey
Keyword(s):  
Thick Film ◽  
Room Temperature ◽  
Equivalent Circuit Model ◽  
Wide Frequency Range ◽  
Laser Evaporation ◽  
Direct Write ◽  
Electrical Characteristics ◽  
Direct Writing ◽  
Ambient Conditions ◽  
Laser Transfer

Polymer thick film (PTF) resistors were fabricated using a new laser-based transfer technique called matrix-assisted pulsed laser evaporation direct write (MAPLE-DW). MAPLE-DW is a versatile direct writing technique capable of writing a wide variety of materials on virtually any substrate in air and at room temperature. Epoxy-based PTF resistors spanning four decades of sheet resistances (10 Ω/sq. to 100 kΩ/sq.) were deposited on alumina substrates under ambient conditions. Electrical characteristics of these MAPLE-DW deposited resistors were studied at a wide frequency range (1 MHz to 1.8 GHz), and the results were explained through an equivalent circuit model and impedance spectroscopy. Temperature coefficient of resistance measurements for the PTF resistors were performed between 25 and 125 °C. The results based on the percolation theory were used to explain the temperature dependence of the resistance behavior of the PTF resistors.

Analysis of the characteristics of thick-film NTC thermistor devices manufactured by screen-printing and firing technique and by room temperature aerosol deposition method (ADM)

2017 ◽  
Vol 10 (06) ◽  
pp. 1750073 ◽  
Author(s):  
Michaela Schubert ◽  
Jaroslaw Kita ◽  
Christian Münch ◽  
Ralf Moos
Keyword(s):  
Thick Film ◽  
Screen Printing ◽  
Room Temperature ◽  
Mechanical Stability ◽  
Negative Temperature ◽  
Aerosol Deposition ◽  
Deposition Method ◽  
Aerosol Deposition Method ◽  
Ntc Thermistor ◽  
Screen Printed

The study compares thick-film NTC thermistor devices, produced by the screen-printing (and firing) technique and by the Aerosol Deposition Method (ADM) at room temperature. The devices are compared with respect to film quality (optical, mechanical) and to the negative temperature coefficient of resistance (NTCR) parameters [Formula: see text] and [Formula: see text]. While the screen-printed films are porous, the Aerosol Deposited (AD) films are characterized by high tightness, mechanical stability, and a production at room temperature. The electrical analysis shows that the AD films reach the [Formula: see text]- and [Formula: see text]-values of bulk NTCRs from literature after a moderate tempering step below 400[Formula: see text]C in air. The screen-printed films show [Formula: see text]-values that are comparable to the values of bulk NTCRs from literature and [Formula: see text]-values that are significantly higher.

scholarly journals Effects of Refiring Processes on Electrical and Structural Properties of Thick-Film Resistors

1980 ◽  
Vol 6 (3-4) ◽  
pp. 165-171 ◽  
Author(s):  
A. Cattaneo ◽  
M. Prudenziati
Keyword(s):  
Electrical Properties ◽  
Thick Film ◽  
Structural Properties ◽  
Microprobe Analysis ◽  
Electrical Characteristics ◽  
Glass Crystallization ◽  
X Ray Diffraction ◽  
Sheet Resistivity ◽  
Chemical Modifications ◽  
X Ray

in order to analyze the influence of the refiring processes in thick film resistors, electrical and structural properties of resistors, refired up to ten times, through the original profile, were compared.The apparent sheet resistivity and TCR were measured as a function of the number of the firing cycles, and these electrical characteristics analyzed in connection with observations of structural and chemical modifications evidenced through X-ray diffraction, SEM inspection and microprobe analysis.Marked effects were observed, such as segregation of the conductive grains in the resistor thickness, chemical reactions of glass-modifiers with glass, crystallization of new phases, together with substrate/thick-film interactions.It is found that in some cases (e.g. for DP 1400 resistor series) the phenomena induced by refiring are few and simple enough for us to interprete the corresponding electrical modifications, while in other systems the presence of many competitive chemicophysical effects inhibit their unambiguous correlation with the electrical properties of these resistors.

Various Applications of Silver Nano-Particles by Ultrasonic Eco-Fabrication

2005 ◽  
Vol 486-487 ◽  
pp. 530-533 ◽  
Author(s):  
Yamato Hayashi ◽  
Hirotsugu Takizawa ◽  
Yoshitaka Saijo ◽  
Tohru Sekino ◽  
Katsuaki Suganuma ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Noble Metal ◽  
Room Temperature ◽  
Silver Oxide ◽  
Nano Particles ◽  
Metal Particles ◽  
Noble Metal Oxides ◽  
Alcohol System ◽  
Silver Metal ◽  
Suitable Process

Applications of silver nano-sized metal particles were investigated for a new, ecologically friendly and economical liquid-solid (silver oxide-alcohol) system. Silver metal oxides as starting materials have merits in metal particles fabrication because these materials are decomposed only by heating in air. That is, noble metal oxide does not use thestrong reduction atmosphere. This reduction is ecologically clean because many noble metal oxides are not toxic, and because O2 is evolved during decomposition. We reduced silver metal oxides by ultrasound and fabricated silver nano metal nanoparticles at room temperature, and various applications were investigated. By choosing a suitable process and conditions, it is reasonable to expect that ultrasonic eco-fabrications can be extended to obtain various silver nano-particles containing materials.

Dynamic and Quasi-Static Compressive Deformation Behaviour of Polyimide Foam at Various Elevated Temperature

2014 ◽  
Vol 566 ◽  
pp. 158-163 ◽  
Author(s):  
A. Yosimoto ◽  
Hidetoshi Kobayashi ◽  
Keitaro Horikawa ◽  
Keiko Watanabe ◽  
Kinya Ogawa
Keyword(s):  
Compressive Strength ◽  
Room Temperature ◽  
Deformation Behaviour ◽  
Testing Machine ◽  
Negative Temperature ◽  
Strain Rates ◽  
Compression Tests ◽  
Hopkinson Pressure Bar ◽  
Universal Testing ◽  
Pressure Bar

In order to clarify the effect of strain rate and test temperature on the compressive strength and energy absorption of polyimide foam, a series of compression tests for the polyimide foam with two different densities were carried out. By using three testing devices, i.e. universal testing machine, dropping weight machine and sprit Hopkinson pressure bar apparatus, we performed a series of compression tests at various strain rates (10-3~103s-1) and at several test temperatures in the range of room temperature to 280 ̊C. At over 100 s-1, the remarkable increase of flow stress was observed. The negative temperature dependence of strength was also observed.

Room temperature Mg reduction of TiO2: formation mechanism and application in photocatalysis

2019 ◽  
Vol 55 (53) ◽  
pp. 7675-7678 ◽  
Author(s):  
Di Zu ◽  
Zhongfei Xu ◽  
Ao Zhang ◽  
Haiyang Wang ◽  
Hehe Wei ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Formation Mechanism ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Oxide Structure

A Mg/HCl infiltrated metal oxide structure was designed as a facile approach for implanting oxygen vacancies and H atoms into metal oxides.

Thermooxidative Aging Studies on Silicone Rubber and Lifetime Prediction

2013 ◽  
Vol 777 ◽  
pp. 11-14
Author(s):  
You Shan Wang ◽  
Sha Sha Jiang ◽  
Yu Peng Liu
Keyword(s):  
Silicone Rubber ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Activation Energies ◽  
Lifetime Prediction ◽  
Arrhenius Behavior ◽  
Compression Set ◽  
Degradation Processes ◽  
Aging Studies ◽  
Significant Compression

Silicone rubber have been aged in air while under 25% compression at temperature up to 250°C. These studies examined the compression set of silicone rubber at accelerated (elevated) temperatures and were then used to make predictions about compression set at room temperature. The data obtained could be amenable to timetemperature superposition and Arrhenius treatment. The results suggest the presence of two degradation processes with activation energies of 71.6 kJ mol-1 (for temperatures above 165 °C) and 26.08 kJ mol-1 (for temperatures below 165 °C). Based on the extrapolation of the non-Arrhenius behavior, it was estimated that significant compression set loss would occur after around 67 years at 25 °C.

scholarly journals The Deformation Behavior and Bending Emissions of ZnO Microwire Affected by Deformation-Induced Defects and Thermal Tunneling Effect

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5887
Author(s):  
Linlin Shi ◽  
Hong Wang ◽  
Xiaohui Ma ◽  
Yunpeng Wang ◽  
Fei Wang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Luminescent Properties ◽  
Tunneling Effect ◽  
Light Sources ◽  
Electrical Characteristics ◽  
Fundamental Research ◽  
Induced Defects ◽  
Theoretical Simulations ◽  
Bright Emission

The realization of electrically pumped emitters at micro and nanoscale, especially with flexibility or special shapes is still a goal for prospective fundamental research and application. Herein, zinc oxide (ZnO) microwires were produced to investigate the luminescent properties affected by stress. To exploit the initial stress, room temperature in situ elastic bending stress was applied on the microwires by squeezing between the two approaching electrodes. A novel unrecoverable deformation phenomenon was observed by applying a large enough voltage, resulting in the formation of additional defects at bent regions. The electrical characteristics of the microwire changed with the applied bending deformation due to the introduction of defects by stress. When the injection current exceeded certain values, bright emission was observed at bent regions, ZnO microwires showed illumination at the bent region priority to straight region. The bent emission can be attributed to the effect of thermal tunneling electroluminescence appeared primarily at bent regions. The physical mechanism of the observed thermoluminescence phenomena was analyzed using theoretical simulations. The realization of electrically induced deformation and the related bending emissions in single microwires shows the possibility to fabricate special-shaped light sources and offer a method to develop photoelectronic devices.

scholarly journals Ferrite-based room temperature negative temperature coefficient printed thermistors

2020 ◽  
Vol 56 (24) ◽  
pp. 1322-1324
Author(s):  
J.R. McGhee ◽  
J.S. Sagu ◽  
D.J. Southee ◽  
P.S.A. Evans ◽  
K.G.U. Wijayantha
Keyword(s):  
Temperature Coefficient ◽  
Room Temperature ◽  
Negative Temperature Coefficient ◽  
Negative Temperature
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