Specifications:

• Size: 10mm x 10mm x 0.5mm
• Orientation: (001) + / - 0.5 ^o
• Polish: two sides EPI polished with surface roughness < 5 A
• Package: One 1000 class clean room with 100 class plastic bag

Features

• Good lattice match with perovskite structure superconductors
• Stable structure with much less defects than SrTiO₃
• Low dielectric constant suitable for microwave or high frequency application

Typical Properties

• Purity 99.99%
• Color Light Brown
• Crystal Structure: Tetragonal
• Lattice Constabt: a = b = 3.756 A C = 12.636 A
• Density: 5.92 g / cc
• Melting Point 1650 ^oC
• Thermal Expansion Coeff. 12 ppm / ^oC
• Dielectric Constant 16.81 at a axis 20.02 at c axis
• Loss Tangent (1 MHz, 300K) 6x10⁴ at a axis 8x10⁴ at c axis
• Maximum as grown. crystal size 30 mm dia x 35 mm length
• Standard Orientation (100), (001)
• Edge alignment Available on request

Comparison of SrTiO3 ˇ§CLaAlO3 - SrAlO4 Crystal

Properties/Crystal	SrTiO3	LaAlO3	SrLaAlO4
Structure	Cubic	Rhombohedral at 25 oC: Cubic at > 435 oC :	Tetragonal
Lattice Constant	a=3.905	a=3.821 A	a=b=3.756 A c= 12.636
mismatch to YBCO (a=3.9)	+0.12%	-2.0%	-3.7%
Dielectric Constant	~300	~ 25	~ 17
Grown Method	Vernuil	CZ	CZ
Thermal expansion	10.4 (x10-6/ oC)	10 (x10-6/ oC)	12 (x10-6/ oC)
Melting point	2080	2080 oC	1650 oC
Density	5.175 g/cm3	6.52 g/cm3	5.92 g / cc
Max. Crystal size	30 mm dia.	75 mm dia	35 mm dia
Crystal quality	Wide rocking curve due to dislocation density	Visible twin due to phase transition around 400 oC	Narrow rocking curve, no twins, less defects
Crystal cost	Higher	Lower	Medium