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This is explained by the proceeding condensation reactions during the ten weeks of aging and drying inside the SiO2 structure, causing it to exude moisture and shrink strongly as its pores become smaller [3].
Scherer: Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic Press Inc.

Preparation and luminescent Properties of Zn2SiO4:Mn 2+ Limei Cao1,a, Wenbo Bu 2, Chuanai Ren1, Xiao Xu 1and Qiang Li1,b 1 Department of Chemistry, East China Normal University, Shanghai 200062, China 2 Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200062, China a 51050606011@student.ecnu.edu.cn, bqli@chem.ecnu.edu.cn Keywords: Preparation; Zn2SiO4:Mn 2+; Phosphors Abstract.
Results and Discussion Fig.1 shows the X-ray diffraction pattern of the Zn2-xMnxSiO4(x=0.02) phosphors prepared via the dipping process, which shows that typical zinc silicate crystal structure.

X-ray diffraction (XRD), Siemens D5000 was performed to examine the single phase material and determine the crystal structure of identified material.
Idris, XRD and FTIR Studies of Natural Cellulose Isolated From Acacia mangium, Belian (Euxideroxilon zwagery) and Sawmill Sawdust, Asian Chemistry Letter, India: Anita Publication, (2011)

Rosser: 'Molecular Beam Mass Spectrometry studies of the gas phase chemistry occurring during Microwave Plasma assisted Chemical Vapour Deposition of Diamond', Diam.
Csorbai et al.: Microwave-CVD Diamond layers on 3D structured Si for Protective Coating, 2002 Diamond and Related Materials 1 5 0 x 2 0 0 n m

Fig.1 XRD of powder samples: comparing the effects of different crystallisation temperatures and different Pb:Fe ratios Thermomagnetic analysis (TMA), Fig.2, revealed the presence of two different magnetic phases: M-type ferrite (TC= 450-460°C) and the second was most likely due to spinel structure magnetite (FeFe2O4, TC= 580°C), although, maghemite (γ-Fe2O3,) has a Curie temperature 590-675°C.
The metastability of PbFe12O19 has some implications on the chemistry that has been used in previous works and that attempted to produce this compound at low temperatures.

Preparation and Properties of Nylon 6/66 Copolymer with a Small Proportion of Hexamethylene Adipamide Salt Yuwen Yu1,a, Kewen Shu1,b, Ling Zhong1,c, Chengcai Zeng1,d and Dong Zhang1,e * 1Institute of Applied Chemistry, Wenzhou University, Wenzhou, Zhejiang, 325035, China ayuyuwen1900@163.com, b772935509@qq.com, c15857799703@163.com, dzengbroandsis@qq.com, edzhang@wzu.edu.cn * Corresponding author, Tel.:+86 -0577-86689510, E-mail: dzhang@wzu.edu.cn Keywords: ɛ-Caprolactam, Hexamethylene adipamide salt, Melt polycondensation Abstract.
The polyamide has high bibulous rate because the amide bond in polyamide structure is easy to form hydrogen bond between water molecules, so the water absorption degree of the polymer had a close relationship with the concentration of amide bond.

Sintering at 900o C resulted in a structure with moderate porosity of 28-30% and well-necked particles.
Brinker, Sol-gel science, the physics and chemistry of sol-gel processing. 1990, New York: Academic Press

The products were finally dried at 60 oC. 2 Result and discussion 2.1 XRD analysis Crystal structure of the synthesized products at different pH values were characterized using a D/max 2550V X-ray powder diffractometer (XRD) with Cu Kα radiation (λ=0.154056nm) (Rigaku, Japan).
Chinese Journal of Inorganic Chemistry, 2010, 6(26): 1079-1082

Fractional Order Generalized Electro-Magneto-Thermo-Elasticity with Magnetic Monopoles and Geometrical Nonlinearity* Yajun Yua, Xiaogeng Tianb State Key Laboratory for Mechanical Structure and Vibration, Xi’an Jiaotong University, Xi’an 710049, P.R.
On a separate front, investigations concerning fractional calculus have become increasingly important as numerous models in the field of chemistry, physics, aerodynamics, etc. are now expressed in terms of fractional order.

Experimental procedure GaN nano-column structures were grown on gold (Au) coated Si(111) oriented substrates by MOCVD using a horizontal quartz reactor.
Govindaraj: Progress in Solid State Chemistry Vol. 31 (2003), p. 5