Diffusion Database

Diffusion Database (Kakusan)

The Diffusion Database aims to cover all the basic diffusion data of metallic and inorganic materials mainly from the literature sources. The database consists of "diffusion data" and "reference data". Currently the system primarily contains information of pure metals, alloys, semiconductors, ceramics and intermetallics.

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Number of open data

Mar. 28, 2024
Diffusion data 29,692
References 5,408


1. Diffusion data


(a) D=D0*exp(-Q/RT)
D: diffusion coefficient (m2/s), D0: diffusion constant (frequency factor) (m2/s)
Q: activation energy (kJ/mol), (1eV=96.5 kJ/mol)
R: gas constant=8.31446 J/(mol*K), T: absolute temperature (K)

(b) P=s*δ*D(gb) (m3/s)
P: grain boundary diffusivity (m3/s), s: segregation factor
δ:grain boundary width (m), D(gb): grain boundary diffusion coefficient (m2/s)

(c) others
D(itd): interdiffusion coefficient, D(itr): intrinsic diffusion coefficient


AES: Auger electron spectroscopy, EPMA: Electron probe micro-analyzer
FIM: Field ion microscopy, RBS: Rutherford backscattering spectrometry
SEM: Scanning electron microscopy, SIMS: Secondary-ion mass spectrometry

Listed data in the table

"material", "chemical composition (wt.%, at.%, stoichiometrical expression)", "diffusant", "D0", "Q", "Tmin", "Tmax", "measurement", "reference code", etc.

Graphical expression of D (Arrhenius plot)
X Axis 1/T (K-1) X2 Axis T (K)
Y Axis D (m2/s) Y2 Axis L=2√D (m)

Diffusion coefficient D=D0exp(-Q/RT)
Diffusion length L(t)=2√Dt, L=2√D at t=1s

2. Reference data

Listed data in the table

"title", "authors", "journal name", "affiliation", "the year of issue", "vol.", "page"


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