Thermoluminescence measurements of trap depth in alkali feldspars extracted from bedrock samples

Compressibility mechanisms of alkali feldspars: New data from reedmergnerite

Structural and volume compressibility data for reedmergnerite, NaBSi3O8, were obtained by single-crystal X-ray diffraction at pressures up to 4.7 GPa. The bulk modulus was determined to be 69.8(5) GPa with the pressure derivative constrained to 4. Unit-cell compression is anisotropic, as indicated by unit strain tensors. Tetrahedral bond lengths and angles remained relatively constant over the ...

Towards Improved Prediction of the Bedrock Depth

Oxidation and Sulfomethylation of Alkali- Extracted Lignin from Corn Stalk

A lignosulfonate was prepared from alkali-extracted corn stalk lignin (AEL) by oxidation under mild conditions and sulfomethylation. The oxidized AEL exhibited lower molecular weight, narrower molecular weight distribution, and higher phenolic hydroxyl content than AEL, demonstrating that oxidized AEL was more reactive than those before oxidation. The content of sulfonic groups was significantl...

Determination of uncertainty in parameters extracted from single spectroscopic measurements.

The ability to quantify uncertainty in information extracted from spectroscopic measurements is important in numerous fields. The traditional approach of repetitive measurements may be impractical or impossible in some measurements scenarios, while chi-squared analysis does not provide insight into the sources of uncertainty. As such, a need exists for analytical expressions for estimating unce...

The determination of the orthoclase content of homogenized alkali feldspars using the 201 X-ray method

S U M M A R Y . Forty-three natural alkali feldspars have been homogenized and used to correlate d.~01 with wt % K20. The regression of Or on dg01 is Or (wt %) = 465"5 d~01 (~)-1877"5, and is comparable to that obtained on an exchanged orthoclase (Wright, I968). A deviation from the Orville (I963, I967) determinative line for synthetic sanidine-albite is greatest at the high potassium end of th...