Complete Phase Change of Y2NiMnO6 Ceramics Doped with TiO2 at High Temperature

2018 ◽  
Vol 879 ◽  
pp. 47-50
Author(s):  
Naphat Albutt ◽  
Suejit Pechprasarn ◽  
Sangwoei Sawekwiharee ◽  
Anchana Kuttiyawong ◽  
Panakamon Thonglor ◽  
...  
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Electrical Properties ◽  
Phase Change ◽  
Perovskite Structure ◽  
Double Perovskite ◽  
Ceramic Materials ◽  
Sintering Time ◽  
Fcc Structure

Determining the structure of ceramic materials is essential in order to fully characterize the electrical properties and improve existing materials. YMNO ceramics (Y2NiMnO6) prepared by compression and sintering were doped with TiO2 and analyzed using XRD and SEM. The calcined sample prior to sintering contained phases of the YMNO double perovskite and TiO2. Following sintering at 1400°C, the perovskite structure was replaced by Y2Ti2O7 fcc structure, and the grain size was found to increase with sintering time up to 18 hours. This sets a limit to the amount of TiO2 which can be used to successfully dope the YMNO ceramic.

Crystal data for NH(CH3)3GeCl3

1982 ◽  
Vol 15 (2) ◽  
pp. 247-248 ◽  
Author(s):  
A. Möller ◽  
J. Felsche
Keyword(s):  
High Temperature ◽  
Phase Change ◽  
Perovskite Structure ◽  
Room Temperature ◽  
Structure Type ◽  
Crystal Data ◽  
Space Group ◽  
Cell Parameters ◽  
Orthorhombic Modification ◽  
High Temperature Form

NH(CH3)3GeCl3, C3H10N+.Ge2+.3Cl−, crystallizes at room temperature in an orthorhombic modification with a = 9.537(2), b = 8.235(2), c = 12.138(2) Å, Z = 4, space group Cmc21. These cell parameters correspond to a derivative of the cubic perovskite structure type, with a≃b≃\sqrt{2} a cubic and c≃ 2a cubic. Unlike other chlorogermanates(II) there is not a phase change to an ionically conducting cubic high-temperature form.

The Grain Structure of Nd Doped Y2NiMnO6 Ceramics Sintered at High Temperature

2018 ◽  
Vol 879 ◽  
pp. 18-21
Author(s):  
Naphat Albutt ◽  
Suejit Pechprasarn ◽  
Sangwoei Sawekwiharee ◽  
Anchana Kuttiyawong ◽  
Panakamon Thonglor ◽  
...  
Keyword(s):  
Grain Size ◽  
Image Analysis ◽  
High Temperature ◽  
Large Range ◽  
Dopant Concentration ◽  
Granular Structure ◽  
Grain Structure ◽  
Sem Image ◽  
Sintering Time ◽  
Sem Image Analysis

The granular structure of ceramic material influences the electrical properties. Ceramics of YMNO (Y2NiMnO6) doped with Nd were produced by compression and sintering. Grain size was determined from SEM image analysis. Generally, As the Nd dopant concentration was increased, the grain size increased with sintering time. However, at the highest dopant levels of 30% and 20% Nd, a large range in grain size was observed with regions of defective growth. In contrast, a more uniform grain growth was seen for the 10% Nd doped ceramic at all sintering times.

Synthesis and crystal structure of double-perovskite compound Sr2FeMoO6

2010 ◽  
Vol 25 (S1) ◽  
pp. S17-S21 ◽  
Author(s):  
Y. C. Hu ◽  
J. J. Ge ◽  
Q. Ji ◽  
B. Lv ◽  
X. S. Wu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Perovskite Structure ◽  
Double Perovskite ◽  
Rietveld Refinements ◽  
Synthesis And Crystal Structure ◽  
Bond Lengths ◽  
Sintering Time ◽  
Refinement Method

Samples of single-phase Sr2FeMoO6 were successfully prepared by solid-state reaction with long sintering times. The crystal structures of the Sr2FeMoO6 samples were determined from X-ray powder diffraction data using the Rietveld refinement method. The structure results obtained by the Rietveld refinements show that an increase in the total sintering time of the solid-state reaction is an effective method to obtain single Sr2FeMoO6 phase and to improve the ordering of Fe and Mo cations (or reducing antisite defects) in the double-perovskite structure. The volume of the tetragonal unit cell of Sr2FeMoO6 contracts slightly after successive sintering treatments. The averaged Fe-O and Mo-O bond lengths as well as the tilt between the FeO6 and the MoO6 octahedra decrease with increasing total sintering time. Our results suggest that the detected subtle changes in crystal structure, such as bond lengths and bond angles between the Fe and Mo cations and oxygen, in the ordered double-perovskite structure may be responsible for the large effects on previously reported transport and magnetic properties of an oxide metal.

Electrical Properties of Y2NiMnO6 Ceramics Sintered at High Temperature

2015 ◽  
Vol 804 ◽  
pp. 55-58 ◽  
Author(s):  
Thanapong Sareein ◽  
Panakamon Deeyai ◽  
Bundit Putasaeng ◽  
Naphat Chathirat
Keyword(s):  
Thermal Decomposition ◽  
High Temperature ◽  
Electrical Properties ◽  
Double Perovskites ◽  
Decomposition Technique ◽  
Frequency Range ◽  
Spectroscopy Technique ◽  
Sintering Time ◽  
Impedance Spectroscopy Technique

In this work, impedance spectroscopy technique was used in order to investigate the electric properties of double perovskites of the Y2NiMnO6 ceramics, which were prepared by thermal decomposition technique at 800°C for 6 hours and then sintered at a high temperature of 1400°C for 6, 12, 18, and 24 hours. Consequently, the electric characterization of the Y2NiMnO6 ceramics was performed at 30°C °C in the frequency range from 102 Hz to 108 Hz. The results in the Rg with 10,000, 9,990, 6,400, and 1,700 (Ω) at sintering time, respectively. Dispersion was observed in the variation of impedance values with frequency. Possible reason for all the above observation was discussed.

HAYNES ALLOY No. 625SQ

Alloy Digest ◽  
2003 ◽  
Vol 52 (8) ◽  
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Fatigue Resistance ◽  
Heat Treating ◽  
Temperature Performance ◽  
Haynes Alloy

Abstract Haynes 625SQ alloy is a modification of Haynes 625 alloy (see Alloy Digest Ni-354, January 1988) with tighter controls on chemistry and a finer grain size for fatigue resistance up to 680 deg C (1250 deg F). This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance as well as heat treating. Filing Code: Ni-612. Producer or source: Haynes International Inc.

Review and characterisation of high-temperature phase change material candidates between 500 C and 700°C

2021 ◽  
Vol 150 ◽  
pp. 111528
Author(s):  
Ming Liu ◽  
Ehsan Shamil Omaraa ◽  
Jia Qi ◽  
Pegah Haseli ◽  
Jumal Ibrahim ◽  
...  
Keyword(s):  
High Temperature ◽  
Phase Change ◽  
Phase Change Material ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Change Material
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