Correlation between the d-value and the M2+:M3+ cation ratio in Mg–Al–CO3 layered double hydroxides
Source abstract
Abstract
Abstract Twenty-six samples of natural layered double hydroxides (LDHs: hydrotalcite, pyroaurite and quintinite) from various localities worldwide have been studied by means of single-crystal, powder X-ray diffraction and electron microprobe analysis. High crystallinity of samples allowed for the good accuracy of the measured d-values and reliable values of the M2 +:M3 + ratios. Based on the obtained data, it has been found out that d-value for LDHs depends upon the M2 +:M3 + ratio that can be explained by purely crystal chemical reasons. The ideal d-values for M2 +:M3 + = 2:1 (quintinite group) and 3:1 (hydrotalcite group) are 7.56 and 7.80 A, respectively, whereas intermediate cation ratios correspond to the intermediate d-values. The observed quantitative correlation between d-value and M2 +:M3 + cation ratio for carbonate LDHs can be described by the linear function d = 0.2385 × R + 7.0852 (R = M2 +:M3 +), which allows for the estimation of M2 +:M3 + on the basis of d-value and vice versa.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Layered Double Hydroxides Synthesis and Applications · Thermal Expansion and Ionic Conductivity · Magnesium Oxide Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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