Synthesis, processing, and characterization of negative thermal expansion zirconium tungstate nanoparticles with different morphologies

2011 ◽  
Vol 131 (1-2) ◽  
pp. 12-17 ◽  
Author(s):  
Prashanth Badrinarayanan ◽  
Md. Imteyaz Ahmad ◽  
Mufit Akinc ◽  
Michael R. Kessler
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Zirconium Tungstate

Preparation and characterization of negative thermal expansion Sc2W3O12/Cu core–shell composite

2012 ◽  
Vol 38 (1) ◽  
pp. 541-545 ◽  
Author(s):  
Qinqin Liu ◽  
Juan Yang ◽  
Xiaonong Cheng ◽  
Guoshan Liang ◽  
Xiujuan Sun
Keyword(s):  
Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Core Shell ◽  
Shell Composite

scholarly journals Structural and Thermal Unusual Properties in Invar Behavior of Ni-Mn Alloys

2020 ◽  
Vol 17 (2(SI)) ◽  
pp. 0629
Author(s):  
Salih Darweesh et al.
Keyword(s):  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Lattice Distortion ◽  
Negative Thermal Expansion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ferromagnetic Metals ◽  
Invar Effect

The Invar effect in 3D transition metal such as Ni and Mn, were prepared on a series composition of binary Ni1-xMnx system with x=0.3, 0.5, 0.8 by using powder metallurgy technique. In this work, the characterization of structural and thermal properties have been investigated experimentally by X-ray diffraction, thermal expansion coefficient and vibrating sample magnetometer (VSM) techniques. The results show that anonymously negative thermal expansion coefficient are changeable in the structure. The results were explained due to the instability relation between magnetic spins with lattice distortion on some of ferromagnetic metals.    

High Temperature Stability of Zirconium Tungstate

2020 ◽  
Vol 993 ◽  
pp. 771-775
Author(s):  
Ping Zhai ◽  
Xiao Feng Duan ◽  
Da Qian Chen
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Solid Phase ◽  
Coefficient Of Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Tungstic Acid ◽  
High Temperature Stability ◽  
Zirconium Tungstate

In this paper, zirconium tungstate ceramic with negative thermal expansion coefficients was prepared from zirconium oxide and tungstic acid by solid phase synthesis and high temperature quenching technique with a sintering temperature of 1200 °C. The phase structure of the material was determined by X ray and the thermal expansion coefficient was measured by dilatometer, while the TG-DTA analysis of the prepared material was also carried out. The results showed that zirconium tungstate with high purity could be obtained by rapid chilled while fired at 1200 °C. The coefficient of thermal expansion at 300 °C was minus 8.5413 × 10-6K-1, which is identical with the theoretical value. The thermal expansion coefficient of the material was negative fired lower than 750 °C, while it was positive fired higher than 750 °C, and this indicates that the decomposition temperature of zirconium tungstate is about 750 °C.

Negative thermal expansion in a zirconium tungstate/epoxy composite at low temperatures

2013 ◽  
Vol 49 (1) ◽  
pp. 392-396 ◽  
Author(s):  
Lauren A. Neely ◽  
Vladimir Kochergin ◽  
Erich M. See ◽  
Hans D. Robinson
Keyword(s):  
Thermal Expansion ◽  
Low Temperatures ◽  
Epoxy Composite ◽  
Negative Thermal Expansion ◽  
Zirconium Tungstate

Zirconium tungstate reinforced cyanate ester composites with enhanced dimensional stability

2009 ◽  
Vol 24 (7) ◽  
pp. 2235-2242 ◽  
Author(s):  
Prashanth Badrinarayanan ◽  
Ben Mac Murray ◽  
Michael R. Kessler
Keyword(s):  
Thermal Expansion ◽  
Dimensional Stability ◽  
Coefficient Of Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Thermomechanical Analysis ◽  
Dynamic Mechanical Properties ◽  
Filler Loading ◽  
Cyanate Ester ◽  
Scanning Calorimetry ◽  
Zirconium Tungstate

Zirconium tungstate (ZrW2O8) is a unique ceramic material characterized by isotropic negative thermal expansion behavior over a wide temperature range. Incorporation of ZrW2O8 is expected to improve the dimensional stability of polymers by reducing the overall coefficient of thermal expansion (CTE). In this work, the thermal and dynamic mechanical properties of a bisphenol E cyanate ester reinforced with various loadings of ZrW2O8 are examined. Thermomechanical analysis indicates that the incorporation of ZrW2O8 results in a decrease in CTE at temperatures above and below the glass transition temperature (Tg) of the neat resin. The dynamic storage moduli of the composites reinforced with ZrW2O8 are found to increase with increasing filler loading. Furthermore, the various phase behaviors exhibited by ZrW2O8 are also examined by differential scanning calorimetry measurements.

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