Grain size, variation

Table 2.8 Grain size variations of 3-MgHj as a function of milling time of ABCR powder under HES57 mode from Fig. 2.13...

Table 2.9 Grain size variations of premiUed ABCR powder after short cycling...

If two individuals conjugate on an r or a z face, a nucleus of a Japanese twin with 1122 as the composition plane is formed. This indicates that a Japanese twin is not a penetration twin (i.e. not the upper half of an X-shape), but a contact twin (i.e. the upper half of a Y-shape). Horizontal banding in geode agate (see Section 10.9) appears through grain size variation due to gravitational sedimentation, and con-... 

Fig. 3l Grain-size variation in Fe-25 Cr and Fe-25 Cr-0.3 Y alloys during oxidation at 700 to 1000°C.

Fig. 4 Grain-size variation in Fe-25Cr, Fe-25Cr-1Ce, and Fe-25Cr-1Y alloys as a function of annealing time.

Grain and sub-grain size variations across a mylonite zone. Contrib. Mineral. Petrol., 70, 193-202. 

Similarly, P-wave velocities can also be used as proxy parameters for a mean grain size prediction. However, as they cover only a small range (1450 -1650 m/s) compared to attenuation coefficients (20 - 800 dB/m) they reflect grain size variations less sensitively. 

Figure 5. A BSE-image from the varved Lake Korttajarvi in Finland is processed with thresholding and open binary operation. The obtained binary image can be used to analyse the grain size variation...

Folk, R. L, 1980. Petrology of Sedimentary Rocks. Hemphill Publishing Company, Austin, 182 pp. Francus, P., 1998. An image-analysis technique to measure grain-size variation in thin section of soft clastic sediments. Sed. Geol. 121 289-298. 

Menking, K. M., 1997. Climatic signals in clay mineralogy and grain-size variations in Owens Lake core OL-92, southeast California. In Smith, G. 1. J. L. Bischoff (eds.) An 800,000- year Paleoclimatic Record from Core OL-92, Owens Lake, Southeast California. Geol. Soc. Amer. Spec. Paper 317 37-48. 

This equation does not account for grain size variations, simply setting a lower limit on the velocity for any porosity (Taylor-Smith, 1974). 

Fig. 3.15 Grain size variations as a function of sintering temperature of the PLZT ceramics before and after thermal anneahng at 1125 °C. Reproduced with permission from [90]. Copyright 2001, Elsevier...

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