Determination of gibbs energy of formation of Ni-B-O system by electromotive force measurement using solid electrolyte期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Determination of gibbs energy of formation of Ni-B-O system by electromotive force measurement using solid electrolyte

Authors:

Hiroaki Yamamoto Masao Morishita Akio Miyata Koichiro Koyama

Affiliation:

(1) the Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, 671-2201 Himeji, Japan

Abstract:

The standard Gibbs energies of formation of Ni₃B, Ni₂B, o-Ni₄B₃(Ni_0.586B_0.414), m-Ni₄B₃(Ni_0.564B_0.436), NiB, and Ni₃B₂O₆ of the Ni-B-O system have been determined by measuring electromotive forces of galvanic cells using a Y₂O₃-stabilized ZrO₂ solid oxide electrolyte. The results are as follows:

$Delta _f G^ circ (Ni_3 B)/J cdot mol^{ - 1} = - 124,800 + 23.1 (T/K) pm 300$

Temperature range: 1198 to 1298 K

$Delta _f G^ circ (Ni_2 B)/J cdot mol^{ - 1} = - 124,400 + 26.3 (T/K) pm 300$

Temperature range: 1182 to 1285 K

$Delta _f G^ circ (Ni_{0.586} B_{0.414} )/J cdot mol^{ - 1} = - 47,300 + 9.70 (T/K) pm 100$

Temperature range: 1193 to 1273 K

$Delta _f G^ circ (Ni_{0.564} B_{0.436} )/J cdot mol^{ - 1} = - 49,100 + 10.2 (T/K) pm 100$

Temperature range: 1193 to 1273 K

$Delta _f G^ circ (NiB)/J cdot mol^{ - 1} = - 113,800 + 29.1 (T/K) pm 300$

Temperature range: 1203 to 1253 K

$Delta _f G^ circ (Ni_3 B_2 O_6 )/J cdot mol^{ - 1} = - 1,934,000 + 455.5 (T/K) pm 1000$

Temperature range: 1182 to 1393 K where the standard pressure is 1 bar (100 kPa).

Keywords:

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