This rhomboid shaped crystal of calcium pyrophosphate, which appears bluish-white (weak positive birefringence) by polarized light with red plate.
焦磷酸钙菱形结晶在红感光板偏振光下呈蓝白色(弱正双折射)。
2
UV curable materials as a polymer matrix and a nematic liquid crystal with positive dielectric anisotropy are mixed and sandwiched between ITO coated glass substrates.
USE: Electric- contact pressure gauges are used for measuring positive and negative pressure of liquids and gases which are nor corrosive to copper and copper alloy and not explosive and crystal.