Optical Properties of SiO2 – TiO2 – La2O3 – Na2O – Y2O3 glasses and A novel process of preparing the parent glass-ceramics

doi:10.21203/rs.3.rs-187779/v1

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Optical Properties of SiO2 – TiO2 – La2O3 – Na2O – Y2O3 glasses and A novel process of preparing the parent glass-ceramics

https://doi.org/10.21203/rs.3.rs-187779/v1

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Journal Publication

published 26 Feb, 2021

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Quaternary glasses with the composition 50SiO₂ – 25TiO₂ – 5La₂O₃ – (20-x) Na₂O – xY₂O₃ where x: (0≤x≥10) were synthesized using the melt-quench technique. XRD examined the nature of prepared glasses. UV-spectroscopic of investigated glass system studied at room temperature. Both optical bandgap and refractive index of the present glass have been increased. The polarizability and basicity were determined. Thermal parameter values increased as Y₂O₃ increased. Under controlling heat, the glass-ceramic were prepared and confirmed using XRD. Glass-ceramics are examined using SEM to evaluate a microstructure. Ultrasonic velocities and elastic-moduli of glass-ceramic samples are increased because of the increase in internal energy. The role of Y₂O₃ modifier in the glass system is clearly demonstrated. Y₂O₃ also works as an excellent nucleating agent that can induce crystallizations, supporting in the creation of the sub-phase of glass-ceramics.

Physical Chemistry

Yttrium

Glass-ceramics

XRD

SEM

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Table 1

Chemical composition of prepared glasses (mol. %)

Sample Name	SiO₂	TiO₂	Na₂O	La₂O₃	Y₂O₃
Sample Name	mol.%
G1	50	25	20	5	0
G2	50	25	18	5	2
G3	50	25	16	5	4
G4	50	25	14	5	6
G5	50	25	12	5	8
G6	50	25	10	5	10

Table 2

Various physical parameters of the studied glasses.

Samples	G 1		G 2	G 3	G 4	G 5	G 6
Number of oxygen atom	1.85		1.89	1.93	1.97	2.01	2.05
Molar Refractivity (cm³/mol)	14		13.16	13.32	12.97	12.5	12.05
Molar Polarizability (A^°3)	5.55		5.22	5.2812	5.14	4.96	4.78
Metallization criterion (M)	0.36		0.362	0.365	0.367	0.37	0.374
Reﬂection loss ()	0.639		0.637	0.635	0.633	0.63	0.626
Electronegativity (χ)	0.699		0.71	0.72	0.725	0.74	0.753
Electron Polarizability (α°)	2.87		2.863	2.85	2.847	2.84	2.82
Optical basicity (˄)	1.35		1.346	1.34	1.34	1.332	1.32
indirect Optical band gab (e.V)	2.601		2.635	2.669	2.699	2.74	2.8
Ionicity (I_b)		0.58	0.578	0.576	0.574	0.571	0.569
Covalency (I_c)		0.42	0.422	0.424	0.426	0.429	0.431

Table 3

Thermal parameters of the studied glasses (^oC).

S	(T_p-T_c)	H_g	Δ T	T_p	T_c	T_g	Sample name
^oC	^oC	^oC	^oC	^oC	^oC	^oC
11.11	78	0.14	86	768	690	604	G 1
12.38	79	0.157	95	780	701	606	G 2
12.73	79	0.16	98	785	706	608	G 3
13.31	84	0.16	100	815	731	631	G 4
16.73	86	0.19	127	866	780	653	G 5
15.5	95	0.16	113	901	806	693	G 6

Table 4:

Peak list and grain-size of the glass-ceramics (G1).

Pos. [2θ°]	Height [cts]	FWHM °2Th.	d-spacing [Å]	Rel. Int. [%]	Tip width [2θ°]	G size nm	Phase and its Crystalline size nm
22.6391	709.82	0.3542	3.92773	29.53	0.3600	80.6	La₂(Ti₂SiO₉), 70.49888
32.0778	2403.5	0.5314	2.79032	100.00	0.5400	54.78	La₂(Ti₂SiO₉), 70.49888
39.5811	895.01	0.3542	2.27695	37.24	0.3600	83.95	La₄Ti (Si₂O₇)₂ (Ti₈O₁₆), 60.23398
46.3840	532.26	0.4133	1.95762	22.14	0.4200	73.6
52.1153	243.96	0.4133	1.75502	10.15	0.4200	75.35
57.4043	695.72	0.4133	1.60526	28.95	0.4200	77.12
66.8322	198.36	0.4133	1.39988	8.25	0.4200	81.1
71.6383	96.53	0.4723	1.31733	4.02	0.4800	73.1
75.0820	38.81	0.9446	1.26522	1.61	0.9600	37.4
76.9051	157.72	0.5904	1.23972	6.56	0.6000	60.5	La₄Ti₅ (Si₂O₇)₂O_8, 69.94197
81.2975	87.59	0.4723	1.18347	3.64	0.4800	78.1
85.1379	91.56	0.7200	1.13869	3.81	0.6000	52.76

Table 5:

Peak list and grain-size of the glass-ceramics (G 6).

Pos. [2θ°]	Height [cts]	FWHM [2 θ°]	d-spacing [Å]	Rel. Int. [%]	Tip width [2θ°]	G size nm	Phase and its Crystalline size nm
19.5792	76.95	0.2952	4.53410	3.93	0.3000	96.18	La_0.5Y_0.5TiO_3,(65.91078)
22.6109	481.73	0.3542	3.93256	24.58	0.3600	80.55
25.4780	103.27	0.3542	3.49615	5.27	0.3600	80.98
28.7768	221.71	0.2952	3.10243	11.31	0.3000	97.84	Y₂Ti₂SiO_9, (76.76907)
29.5494	121.62	0.2952	3.02306	6.20	0.3000	98
30.2113	161.59	0.2952	2.95832	8.24	0.3000	98.2
31.1414	223.12	0.2952	2.87206	11.38	0.3000	98.4
31.9839	1960.04	0.5314	2.79830	100.00	0.5400	54.77
38.6616	83.20	0.2952	2.32896	4.25	0.3000	100
39.5320	752.34	0.3542	2.27967	38.38	0.3600	83.9
43.9363	98.11	0.2952	2.06083	5.01	0.3000	102.2
45.1712	139.29	0.4723	2.00732	7.11	0.4800	64.2
46.3327	440.51	0.3542	1.95967	22.47	0.3600	85.92
47.3145	103.10	0.2952	1.92127	5.26	0.3000	103.5
49.2890	44.07	0.3542	1.84883	2.25	0.3600	86.9
52.0561	197.19	0.3542	1.75688	10.06	0.3600	87.9
56.6288	236.43	0.3542	1.62539	12.06	0.3600	89.7
57.3691	576.42	0.3542	1.60616	29.41	0.3600	90
58.5723	103.19	0.3542	1.57600	5.26	0.3600	90.56
66.7314	175.71	0.5314	1.40175	8.96	0.5400	63
67.6088	119.93	0.3542	1.38568	6.12	0.3600	95
71.5406	96.67	0.3542	1.31888	4.93	0.3600	97.4
75.0633	35.16	0.7085	1.26549	1.79	0.7200	49.8
76.8601	138.16	0.5314	1.24033	7.05	0.5400	67.21
81.2243	78.94	0.5904	1.18435	4.03	0.6000	62.4
85.1694	72.57	0.7200	1.13835	3.70	0.6000	52.78

Table 6

values of sound velocities (v_L and v_T), elastic moduli, Poisson’s ratio, micro hardness, acoustic impedance (Z) and thermal expansion coefficient (α_P), of the studied glass-ceramics.

Sample No.		v_L	v_T		L		G	K		Y		s		H				Z*10⁷				a_P
	(m s⁻¹)			(Gpa)											(Gpa)		Kg/m^-2 s^-1			K^-1
G 1		5425	2885		112	31.703			69.83036526		82.616758		0.303			4.2			1.1		125846.67
G 2		5455	2900		125.1	35. 4			77.97		92.14		0.303			4.64			1.22		126542.67
G 3		5500	2920		131.9	37.18			82.32319467		96.985		0.304			4.865			1.27		127586.67
G 4		5550	2935		143	40			89.73		104.46		0.306			5.187			1.36		128746.67
G 5		5610	2955		157.75221	43.74744525			99.345294		114.4436319		0.308			5.62			1.48		130138.67
G 6		5655	2970		170	46.9			107		122.84		0.310			5.95			1.58		131182.67

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Journal Publication

published 26 Feb, 2021

Read the published version in Silicon →

First submitted to journal
15 Jan, 2021
Editorial decision: Minor revisions
21 Dec, 2020

You are reading this latest preprint version

Optical Properties of SiO2 – TiO2 – La2O3 – Na2O – Y2O3 glasses and A novel process of preparing the parent glass-ceramics

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