Growth and PhysioChemical Properties of Second-Order Nonlinear Optical L-Threonine Single Crystals

Table 4

Comparative data on thermal expansion coefficient values of various novel NLO crystals.

S.No	Compound	System	Thermal expansion coefficient (𝛼/∘C)
(1)	L-threonine	Orthorhombic	𝜶𝟏=𝟒.𝟎𝟔×𝟏𝟎^−𝟓
			𝜶𝟐=𝟑.𝟎𝟗×𝟏𝟎^−𝟓
			𝜶𝟑=𝟏.𝟗𝟒×𝟏𝟎^−𝟓
(2)	Deuterated L-arginine Phosphate	Monoclinic	𝛼1=5.74×10^−5
			𝛼2=0.80×10^−5
			𝛼3=1.83×10^−5
(3)	Urea-(d) tartaric acid	Orthorhombic	𝛼1=5.23×10^−5
			𝛼2=3.86×10^−5
			𝛼3=3.57×10^−5
(4)	Triallyl thiourea mercury bromide	Trigonal	𝛼1=2.83×10^−5
			𝛼3=7.98×10^−5
(5)	Bismuth triborate	Monoclinic	𝛼1=4.81×10^−5
			𝛼2=4.40×10^−5
			𝛼3=−2.69×10^−5
(6)	p-nitrophenolate dihydrate	Orthorhombic	𝛼1=7.48×10^−5
			𝛼2=0.43×10^−5
			𝛼3=1.99×10^−5
(7)	Tri-allyl thiourea cadmium chloride	Trigonal	𝛼1=2.19×10^−5
			𝛼3=6.15×10^−5