The effect of heat treatment temperature on phase formation and luminescence properties of calcium magnesium silicate glass-ceramics doped with Sm2O3

2019 ◽  
Vol 195 (1) ◽  
pp. 11-18
Author(s):  
Wipada Senanon ◽  
Tawee Tunkasiri ◽  
Sukum Eitssayeam ◽  
Gobwute Rujijanagul ◽  
Ploypailin Yongsiri ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Silicate Glass ◽  
Phase Formation ◽  
Heat Treatment Temperature ◽  
Glass Ceramics ◽  
Magnesium Silicate ◽  
Treatment Temperature ◽  
Luminescence Properties ◽  
Calcium Magnesium

scholarly journals Phase Transformation, Optical and Emission Performance of Zinc Silicate Glass-Ceramics Phosphor Derived from the ZnO–B2O3–SLS Glass System

2020 ◽  
Vol 10 (14) ◽  
pp. 4940
Author(s):  
Muhammad Faris Syazwan Mohd Shofri ◽  
Mohd Hafiz Mohd Zaid ◽  
Khamirul Amin Matori ◽  
Yap Wing Fen ◽  
Yazid Yaakob ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Silicate Glass ◽  
Glass Ceramic ◽  
Heat Treatment Temperature ◽  
Glass Ceramics ◽  
Linear Shrinkage ◽  
Treatment Temperature ◽  
Glass System ◽  
Zinc Silicate

A new transparent zinc silicate glass-ceramic was derived from the 55ZnO–5B2O3–40SLS glass system via a controlled heat-treatment method. The precursor glass sample was placed through the heat-treatment process at different temperatures to study the progress in phase transformation, optical performance and emission intensity of the zinc silicate glass-ceramics. For this project, material characterization was measured through several tests using densimeter and linear shrinkage measurement, X-ray diffraction (XRD), Fourier transform infrared reflection (FTIR), ultraviolet–visible (UV–Vis) and photoluminescence (PL) spectroscopy. The density and linear shrinkage measurements show that the density of the particular glass-ceramic samples increases with the progression of heating temperature. The XRD analysis displays the result in which the zinc silicate crystal starts to grow after the sample was treated at 700 °C. In addition, the FTIR spectra indicated that the crystallization of the zinc silicate phase occurred with the appearance of SiO4, ZnO4 and Si-O-Zn bands. UV–visible exhibited the small changes when the value for the optical band gap decreased from 3.867 to 3.423 eV, influenced by the temperature applied to the sample. Furthermore, the PL spectroscopy showed an enhancement of broad green emission at 534 nm upon the increased heat-treatment temperature. Thus, it can be concluded there is the progression of crystal growth as the heat-treatment temperature increased; three emission peaks appeared at 529, 570 and 682 nm for the green, yellow and red emissions, respectively.

Lead titanate glass-ceramics derived from a silicate-based melt

2005 ◽  
Vol 20 (5) ◽  
pp. 1316-1323 ◽  
Author(s):  
P. Sooksaen ◽  
I.M. Reaney ◽  
D.C. Sinclair
Keyword(s):  
Heat Treatment ◽  
Heat Treatment Temperature ◽  
Crystal Size ◽  
Finite Size ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Finite Size Effects ◽  
Peak Broadening ◽  
Permittivity Measurements ◽  
Nano Size

Glass composition 39PbO–1BaO–25TiO2–9.8Al2O3–24.2SiO2–1B2O3 (mol%) crystallized on heat treatment at ≥600 °C to form glass-ceramics whose majority phase was PbTiO3 (PT). At 600 °C, nano-size PT crystals (∼20–50 nm) with a c/a ratio of 1.000(1) were observed, but as heat-treatment temperature increased to 1000 °C, the crystal size and c/a ratio increased to ∼1.2 μm and 1.056(4), respectively. Permittivity measurements as a function of temperature revealed a broad peak at ∼400 °C associated with the nanocrystalline PT crystals, but it sharpened and increased in temperature as heat treatment temperature increased to 1000 °C. The causes of peak broadening and shift of Tc are believed to be due to either clamping of PT crystals by glass matrix, finite size effects due to their intrinsically small size, or the incorporation of dopant impurities such as Al, Si, or Ba ions in the PT phase.

scholarly journals Effect of heat treatment temperature to the crystal growth and optical performance of Mn3O4 doped α-Zn2SiO4 based glass-ceramics

2019 ◽  
Vol 15 ◽  
pp. 102569
Author(s):  
Mohd Hafiz Mohd Zaid ◽  
Khamirul Amin Matori ◽  
Sidek Hj Ab Aziz ◽  
Halimah Mohamed Kamari ◽  
Yap Wing Fen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Crystal Growth ◽  
Heat Treatment Temperature ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Optical Performance

BISMUTH NIOBATE-BASED GLASS-CERAMICS FOR DIELECTRICALLY LOADED MICROWAVE ANTENNAS

2008 ◽  
Vol 01 (01) ◽  
pp. 25-30 ◽  
Author(s):  
MEHDI MIRSANEH ◽  
BEATA ZALINSKA ◽  
OLIVER P. LEISTEN ◽  
IAN M. REANEY
Keyword(s):  
Heat Treatment ◽  
Resonant Frequency ◽  
Glass Ceramic ◽  
Heat Treatment Temperature ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Ceramic Processing ◽  
Ceramic System ◽  
Microwave Antennas ◽  
Microwave Applications

A castable, low melting temperature glass-ceramic system (30% Bi 2 O 3, 30% Nb 2 O 5, 30% B 2 O 3 and 10% SiO 2, in mol%) suitable for microwave applications is fabricated and characterized. Depending on heat treatment temperature, the glass ceramic exhibits permittivity, 15 ≤ ε r ≤ 41, temperature coefficient of resonant frequency of -160 ≤ τ f ≤ +100 MK -1 and microwave quality factor of 300 GHz ≤ Qf ≤ 15000 GHz . The highest Qf occurs at 960°C heat treatment with ε r = 15, τ f = -80 MK -1 and Qf = 15000 GHz . Applications are envisaged such as castable dielectrically-loaded antenna pucks, removing the need for complex ceramic processing.

Influence of Heat Treatment Conditions on Crystallization and Thermal Expansion of Las Glass-Ceramics

2010 ◽  
Vol 168-170 ◽  
pp. 1712-1716
Author(s):  
Zhuo Hao Xiao ◽  
Ming Hua Luo
Keyword(s):  
Heat Treatment ◽  
Thermal Expansion ◽  
Heat Treatment Temperature ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Matrix Glass ◽  
Treatment Conditions ◽  
The Matrix ◽  
Crystal Phases ◽  
Quenching Method

The LAS glass containing P2O5has been prepared by conventional molten quenching method. The influence of heat treatment conditions on crystallization behavior, including phase transformation and microstructure, and thermal expansion coefficient (TEC) of Li2O–Al2O3–SiO2(LAS) glass-ceramics were investigated. DSC, XRD, SEM and TEC were used to detect the microstructure and properties of glass-ceramics under the different heat-treatment conditions. The results show the virgilite crystalline separated firstly from the matrix glass when heat treatment temperature was 850 °C. As the heat treatment temperature increased from 850 °C to 1050 °C, virgilite and β-spodumene were identified as main crystal phases. The TEC of glass-ceramics ranges from 0.5×10-6 °C-1to 2.8×10-6 °C-1, which is much lower than that of matrix glass.

Influence of Thermal Treatment Temperature on Phase Formation and Bioactivity of Glass-Ceramics Based on the SiO2-Na2O-CaO-P2O5 System

2019 ◽  
Vol 798 ◽  
pp. 229-234 ◽  
Author(s):  
Puripat Kantha ◽  
Naris Barnthip ◽  
Kamonpan Pengpat ◽  
Tawee Tunkasiri ◽  
Nuttapon Pisitpipathsin
Keyword(s):  
Heat Treatment ◽  
Thermal Treatment ◽  
Phase Formation ◽  
Raw Materials ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
Thermal Treatment Temperature ◽  
45S5 Glass

In this work, the thermal treatment temperature effect on phase formation and bioactivity of glass-ceramics based on the SiO2-Na2O-CaO-P2O5 system has been studied. The chemical composition of the system is 45 wt.% SiO2, 24.5 wt.% Na2O, 24.5 wt.% CaO and 6 wt.% P2O5 (45S5). The rice husk ash is used as the natural raw materials instead of commercial SiO2. All of the investigated compositions were prepared by melting the glass mixtures at 1350°C for 3 h. The resulting glass samples were heated at different thermal treatment temperatures ranging from 750 to 1050°C with fixed dwell-time for 4 h for crystallization. Phase identification of the 45S5 glass ceramics was carried out by X-Ray diffraction (XRD). Moreover, the physical properties such as density, porosity and mechanical properties were systematically investigated. It was found that, the increasing of heat treatment temperature led to the increasing of the Na2Ca2Si3O9 phase and obtaining better bioactive behavior after incubation of glass-ceramics in simulated body fluid (SBF) for 7 days. The maximum hardness value of 4.02 GPa was achieved after heating at 1050°C for 4 h. However, the density value has slightly changed with various heat treatment temperatures.

Phase Separation and Luminescence of Eu2O3 Doped Boron Silicate Glass

2012 ◽  
Vol 509 ◽  
pp. 303-307 ◽  
Author(s):  
Pei Jing Tian ◽  
Jin Shu Cheng ◽  
Gao Ke Zhang ◽  
Qin Yang
Keyword(s):  
Heat Treatment ◽  
Optical Properties ◽  
Phase Separation ◽  
Silicate Glass ◽  
Heat Treatment Temperature ◽  
Fluorescence Spectra ◽  
Treatment Temperature ◽  
Separation Region ◽  
Luminescent Intensity ◽  
The Eu

Eu2O3 doped boron silicate glass appearing phase separation have been prepared and characterized. The heat treatment temperature was determined by DTA, the microstructure and optical properties of the glass were studied by SEM and fluorescence spectra. The adding of Eu2O3 restrained the phase separation and crystallization of the glass. Eu ions exist in the glass samples as the Eu3+ ions, rather than the Eu2+ ions. As the heat treatment temperature increases, the phase separation region increased gradually, and the luminescent intensity increases.

Phase partitioning and epitaxy of Zr(Al)O2 thin films on cubic zirconia substrates

1995 ◽  
Vol 10 (7) ◽  
pp. 1756-1763 ◽  
Author(s):  
P.K. Narwankar ◽  
J.S. Speck ◽  
F.F. Lange
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Phase Formation ◽  
Epitaxial Layer ◽  
Heat Treatment Temperature ◽  
Single Phase ◽  
Treatment Temperature ◽  
Liquid Precursor ◽  
Phase Partitioning ◽  
Precursor Route

Thin films of ZrO2-Al2O3 were grown on cubic-Zr(Y)O2 substrates by a liquid precursor route. Phase formation and epitaxy of these films was studied as a function of heat-treatment temperature and time. The following sequence of phases was observed in these thin films: Precursor → t-(Zr,Al)O2 → t-(Zr,Al)O2 + γ-(Al,Zr)2O3 → m-ZrO2 + α-Al2O3 Observations strongly suggest that the epitaxial process initiated before the metastable, single phase t-(Zr, Al)O2 partitioned to t-(Zr, Al)O2 + γ-(Al, Zr)2O3. Observations at 1400 °C show that, after the γ to α transformation, α-Al2O3, grains develop an elongated, prismatic morphology and an epitaxial relation with the underlying and surrounding m-ZrO2. The phase that is chemically and structurally similar to the substrate, in this case t-(Zr,Al)O2, or m-ZrO2, forms an epitaxial layer between the substrate and isolated, prismatic grains of heteroepitaxial α-Al2O3.

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