Kinetics of phase transitions of gibbsite during heat treatment in air and in water vapor

被引：0
|
作者：
V. I. Lopushan
G. F. Kuznetsov
R. N. Pletnev
D. G. Kleshev
机构：
[1] South-Ural State University,
来源：
Refractories and Industrial Ceramics | 2007年 / 48卷
关键词：
Apparent Activation Energy; Boehmite; Gibbsite; Closed Volume; Alkali Metal Hydroxide;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Results are provided for a study of the kinetics and mechanism of phase transitions (PT) of gibbsite during heat treatment in air and in water vapor (in the range 170–550°C) by iso-and non-isothermal thermogravimetry, x-ray-phase analysis (XPA), transmission electron microscopy (TEM), nuclear magnetic resonance in 27Al nuclei (NMR 27Al), and chemical analysis. It is shown that PT of gibbsite in air there are two interconnected transitions that occur in parallel: gibbsite → boehmite (γ-AlOOH) and gibbsite → x-ray amorphous Al2O3 that are realized by a topochemical mechanism. In water vapor gibbsite only experiences transition to boehmite (PT-3) that occurs by a dissolution — precipitation mechanism. Apparent activation energies for the PT that occur are determined.
引用
收藏
页码：378 / 382
页数：4
相关论文
共 50 条
  • [1] Kinetics of phase transitions of gibbsite during heat treatment in air and in water vapor
    Lopushan, V. I.
    Kuznetsov, G. F.
    Pletnev, R. N.
    Kleshev, D. G.
    REFRACTORIES AND INDUSTRIAL CERAMICS, 2007, 48 (05) : 378 - 382
  • [2] Phase transformations in γ-Al(OH)3 under heat treatment in air and water vapor
    V. I. Lopushan
    G. F. Kuznetsov
    R. N. Pletnev
    D. G. Kleshchev
    Bulletin of the Russian Academy of Sciences: Physics, 2007, 71 (8) : 1187 - 1189
  • [3] Heat Treatment's Effects on Hydroxyapatite Powders in Water Vapor and Air Atmosphere
    Karabulut, A.
    Bastan, F. E.
    Erdogan, G.
    Ustel, F.
    4TH INTERNATIONAL CONGRESS IN ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE (APMAS 2014), 2015, 1653
  • [4] Handling air to remove heat and water vapor
    Gould, M
    BIOCYCLE, 1996, 37 (08) : 43 - 43
  • [5] Phase Transitions in the Bulk and on Surfaces of Titanium Dioxide during Heat Treatment
    Sosnov, E. A.
    Shevkina, A. Yu
    Malkov, A. A.
    Malygin, A. A.
    RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A, 2022, 96 (01) : 179 - 189
  • [6] Phase Transitions in the Bulk and on Surfaces of Titanium Dioxide during Heat Treatment
    E. A. Sosnov
    A. Yu. Shevkina
    A. A. Malkov
    A. A. Malygin
    Russian Journal of Physical Chemistry A, 2022, 96 : 179 - 189
  • [7] Preparation and Phase Transformation Behavior of Boehmite via Heat Treatment in Water Vapor
    CHEN Bo
    XU Xisheng
    CHEN Xiaoming
    LU Xiancai
    矿物学报, 2013, 33(S1) (S1) : 11 - 11
  • [8] Kinetics of Vapor-Solid Phase Transitions: Structure, Growth, and Mechanism
    Midya, Jiarul
    Das, Subir K.
    PHYSICAL REVIEW LETTERS, 2017, 118 (16)
  • [9] AN IMPACT OF VAPOR-WATER PHASE-TRANSITIONS ON TORNADOGENESIS
    PISNICHENKO, IA
    IZVESTIYA AKADEMII NAUK FIZIKA ATMOSFERY I OKEANA, 1993, 29 (06): : 793 - 798
  • [10] Phase transitions in water vapor sorption on the surface of ion exchangers
    Agafonov, VM
    Ivanov, IV
    ZHURNAL FIZICHESKOI KHIMII, 1996, 70 (05): : 888 - 892
12345