The non-isothermal kinetics of dehydroxylation of Ca (OH) 2 have been studied in dynamic helium atmosphere using TG, DTG, DTA and XRD techniques at different heating rates. The apparent...

XRD analysis showed that the SWWTS sample ( Figure 5) consists dominantly of calcium hydroxide crystalline phase, exhibiting a typical Ca (OH) 2 portlandite pattern with sharp, pronounced high...

X-ray diffraction (XRD) analysis provided insights into the transformation of crystalline phases of CaCO3, starting from aragonite to calcite and eventually to calcium...

2014年1月25日 · The crystalline structure of Ca (OH)2 and CaO nanoparticles were characterized by X-ray diffraction (XRD, PHILIPS, X’pert-MPD system, λ = 1.54 Å). Thermal behavior for the precursor was studied through thermogravimetric analysis (TGA–DSC), which was performed with a STA409PG under nitrogen flow.

2021年11月1日 · The XRD pattern of the polymorphs of CaCO3 is shown in Figure 3. The XRD patterns characteristic peaks corresponding to the stable phase (calcite) and metastable phase (vaterite) were observed at T = 300 K in various reaction times from 5–30 min.

The XRD diffraction is a powerful, non-destructive and useful technique that allow to quickly analyze unknown materials, in terms of crystallinity and phases identification, and to perform materials charac- terization in many scientific fields such as engineering, metallurgy, mineralogy, sciences, archeology, etc.

2023年5月21日 · XRD特征峰CaO的XRD特征峰通常出现在以下位置：- 2θ=32.1°： (200)晶面峰- 2θ=37.0°： (211)晶面峰- 2θ=53.7°： (400)晶面峰这些峰位是由于CaO的晶体结构为立方晶系，晶体中的Ca2+和O2-离子排列次序具有高度对称性，因此在XRD图谱上出现清晰的尖峰。

碳酸钙XRD图谱-上述三个图谱分别是碳酸钙的三种晶型（方解石ቤተ መጻሕፍቲ ባይዱ球霰石和文石）的XRD图谱

In order to address the problem, a comprehensive non-destructive methodology for the simultaneous quantitative determination of the calcium carbonate crystal phases in their ternary mixtures based on the use of Fourier transform Raman spectroscopy (FT-RS) was developed.

序列 Ca-MOF 经受了 13 种不同的环境，以彻底检查其框架稳定性。 研究表明，基于羧酸钙的连接体对水解、Brønsted-Lowry 酸碱和通过曝光前后 XRD 光谱进行微晶修饰的极性稳定性具有卓越的鲁棒性。