Preparation of KBaB5O9 by Two-Step Method and Its Process Kinetics

Abstract

Abstract: In this paper, K₂Ba[B₄O₅(OH)₄]₂·8H₂O was prepared by solution method, and KBaB₅O₉ was prepared by heat treatment of K₂Ba[B₄O₅(OH)₄]₂·8H₂O. The samples were characterized by XRD, FT-IR, and TG-DTA-DTG. The phase change process in the preparation of KBaB₅O₉ by heat treatment of K₂Ba[B₄O₅(OH)₄]₂·8H₂O was analyzed and studied. The phase change experiences five stages: the loss of crystal water, the loss of hydroxyl, recrystallization, redecomposition, and recrystallization after melting. The loss of crystal water is divided into two steps. The kinetic parameters of the second step loss process of crystal water in K₂Ba[B₄O₅(OH)₄]₂·8H₂O were calculated by Kissinger method, Flynn-Wall-Ozawa method, and Šatava-Šesták method. The activation energy E_s of the second-step loss process of crystal water in K₂Ba[B₄O₅(OH)₄]₂·8H₂O is 151.94 kJ/mol, the logarithm of pre-exponential factor lg A_s is 21.25 min^-1, and the mechanism function is G(α)=(1-2α/3)-(1-α)^2/3 (α is conversion rate).

Key words: polymetallic borate, potassium borate barium, wet chemical method, thermal decomposition, kinetics, activation energy

CLC Number:

O611.66

QUAN Zhilin, LI Zhixiang, JIAO Bin, ZHOU Xianwei, XIANG Dexing, FENG Xiaoqin, HUANG Hongsheng. Preparation of KBaB₅O₉ by Two-Step Method and Its Process Kinetics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2954-2962.

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Preparation of KBaB₅O₉ by Two-Step Method and Its Process Kinetics

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