scholarly journals Effect of B4C addition on mechanical and electrical properties of Ca3Co4O9

2020 ◽  
Author(s):  
Hippolyte Amaveda ◽  
Mario Mora ◽  
Oscar J Dura ◽  
Miguel A Torres ◽  
Maria A Madre ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Thermal Expansion ◽  
Solid State ◽  
The Other ◽  
Solid State Method ◽  
Mechanical And Electrical Properties ◽  
State Method ◽  
Xrd Patterns

Abstract B4C added Ca3Co4O9 in different proportions (0, 0.1, 0.25, 0.5, and 0.75 wt.%) have been fabricated using solid-state method. Powder XRD patterns have shown that only Ca3Co4O9 phase can be identified in all the samples. Microstructural observations have allowed determining that B4C compound has been superficially oxidized, producing liquid B2O3 phase during sintering, which has reacted with the Ca3Co4O9 grains to produce bridges between them. In spite of the increase of porosity, these bridges led to an important raise (more than two times) of mechanical properties. On the other hand, while B4C addition has not significantly influenced S values, it has decreased electrical resistivity, thermal conductivity, and thermal expansion. Consequently, ZT values have been also increased, reaching 0.24 in 0.25 wt.% B4C containing samples, which is very close to the best values reported in the literature for Ca3Co4O9 compounds, and two times higher than the obtained in pure materials in this work.

Photoluminescence Properties of Ca3Si2O7: Pr3+ Orange-Red Phosphors Prepared by High-Temperature Solid-State Method

2018 ◽  
Vol 73 (6) ◽  
pp. 555-558 ◽  
Author(s):  
Zhi-Qing Peng ◽  
Rong Chen ◽  
Wen-Lin Feng
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Solid State ◽  
Solid State Method ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Red Phosphors ◽  
Typical Sample ◽  
State Method ◽  
Xrd Patterns

AbstractNovel luminescent materials Ca3-xSi2O7: xPr3+ were successfully prepared by the high-temperature solid-state method. The crystal structure, morphology, and optical spectrum were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), and spectroscopy, respectively. The XRD patterns of the samples indicate that the crystal structure is monoclinic symmetry. The SEM shows that the selected sample has good crystallinity although its appearance is irregular and scalelike. The peak of the excitation spectrum of the sample is located at around 449 nm, corresponding to 3H4→3P2 transition of Pr3+. The peak of the emission spectrum of the sample is situated at around 612 nm which is attributed to 3P0→3H6 transition of Pr3+, and the colour is orange-red. The optimum concentration for Pr3+ replaced Ca2+ sites in Ca3Si2O7: Pr3+ is 0.75 mol%. The lifetime (8.48 μs) of a typical sample (Ca2.9925Pr0.0075)Si2O7 is obtained. It reveals that orange-red phosphors Ca3-xSi2O7: xPr3+ possess remarkable optical properties and can be used in white light emitting devices.

Synthesis and Characterization of 3Y-TZP by Gel Solid-State Method

2011 ◽  
Vol 412 ◽  
pp. 61-64
Author(s):  
Xiao Bo Wu ◽  
Da Zhi Sun ◽  
Dan Yu Jiang ◽  
Hai Fang Xu ◽  
De Xin Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Sintering Behavior ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
X Ray ◽  
Powder Particles ◽  
State Method ◽  
Average Size

3Y-TZP powder has been successfully synthesized by gel solid-state method. The structural phases of powder particles were analyzed by X-ray diffraction and the morphology was analyzed by scanning electron microscopy. The average size of grains was 230 nm. The sintering behavior, mechanical properties and microstructure of 3Y-TZP ceramics sintered by this powder were investigated. The experiment results showed that the mechanical properties of ceramics were excellent.

The Effect of Sintering Temperature to the Properties of Zinc Oxide

2013 ◽  
Vol 795 ◽  
pp. 419-423 ◽  
Author(s):  
J.H. Lim ◽  
C.K. Yeoh ◽  
Pei Leng Teh ◽  
W.M. Arif ◽  
A. Chik
Keyword(s):  
Thermal Conductivity ◽  
Zinc Oxide ◽  
Thermal Properties ◽  
Solid State ◽  
Sintering Temperature ◽  
Solid State Method ◽  
Influence Of Temperature ◽  
Temperature Range ◽  
Influence Of Temperature On ◽  
State Method

In this paper, different sintering temperature used to study the influence of temperature on the structural and thermal properties of zinc oxide (ZnO). On this research, the sample was prepared by solid-state method for zinc oxide (ZnO) at different sintering temperature which was 700°C, 800°C and 900°C. It was observed that the density of bulk ZnO that sintering at 900°C had the higher value of density 5.03 g/cm3. The microhardness of the bulk ZnO had a higher measurement 397.3 Hv after sintered at 900°C. ZnO that sintering at 900°C had been observed that had thermal conductivity 1.1611W/cm-K in the sintering temperature range 700°C to 900°C.

The double molybdate Na9Sc(MoO4)6refined from powder XRD data

2013 ◽  
Vol 69 (11) ◽  
pp. 1301-1303 ◽  
Author(s):  
Aleksandra A. Savina ◽  
Vladimir A. Morozov ◽  
Olga M. Basovich ◽  
Elena G. Khaikina ◽  
Bogdan I. Lazoryak
Keyword(s):  
Solid State ◽  
Three Dimensional ◽  
Basic Structure ◽  
Powder Xrd ◽  
The Other ◽  
Double Molybdate ◽  
Solid State Method ◽  
State Method

Na9Sc(MoO4)6{nonasodium scandium hexakis[tetraoxidomolybdate(II)]} was synthesised by a solid-state method. The basic structure units are polyhedral clusters composed of an ScO6octahedron and three NaO6octahedra sharing total edges. The clusters are connected by sharing vertices with bridging MoO4tetrahedra, forming a three-dimensional framework where the cavities are occupied by the other two crystallographically independent Na atoms.

scholarly journals More superior pyroelectric performance of synthesized dravite by high-pressure solid-state method

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035304
Author(s):  
You Shan ◽  
Guojun Zhou ◽  
Kairen Chen ◽  
Changchun Zhao ◽  
Kun Shen ◽  
...  
Keyword(s):  
High Pressure ◽  
Solid State ◽  
Solid State Method ◽  
State Method

scholarly journals A red emitting of manganese-doped boron carbon oxynitride (BCNO) phosphor materials: facile approach and photoluminescence properties

RSC Advances ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 4161-4166 ◽  
Author(s):  
Bebeh W. Nuryadin ◽  
Fitri A. Permatasari ◽  
Ade Y. Nuryantini ◽  
Irfana D. Faryuni ◽  
Mikrajuddin Abdullah ◽  
...  
Keyword(s):  
Solid State ◽  
Photoluminescence Properties ◽  
Solid State Method ◽  
Red Emission ◽  
State Method ◽  
Boron Carbon

A bright red emission of manganese-doped BCNO (BCNO:Mn) phosphor was firstly synthesized by solid state method.

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