Lithium tantalate

Crystal structure
	__ Li + __ Ta 5+ __ O 2−
Crystal system	trigonal
Space group	R 3 c (No. 161)
General
Surname	Lithium tantalate
other names	Lithium tantalum trioxide; Lithium tantalate (V); Lithium metatantalate;
Ratio formula	LiTaO 3
External identifiers / databases
EC number	234-757-5
ECHA InfoCard	100,031,584
PubChem	159405
Wikidata	Q410458
properties
Molar mass	235.89 g mol −1
Physical state	firmly
density	7.4564 g cm −3
Melting point	1650 ° C
Refractive index	2.183
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 302-312-332
	P: 280
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Lithium tantalate is a chemical compound from the group of tantalates .

Occurrence

A lithium tantalate occurs naturally in the form of the mineral lithiowodginite , although this has the formula LiTa ₃ O ₈ and thus represents a different chemical compound.

Extraction and presentation

Lithium tantalate can be obtained by reacting lithium carbonate with tantalum (V) oxide .

{\ displaystyle {\ ce {Li2CO3 + Ta2O5 -> 2LiTaO3 + CO2 ^}}}

properties

Lithium tantalate is a solid. It has a trigonal crystal structure with the space group R 3 c (space group no. 161) and a specific heat capacity of 424 J / (K kg). Like lithium niobate, it is ferroelectric, linear electro-optic, piezoelectric, and pyroelectric . Lithium tantalate is weakly birefringent . Template: room group / 161

use

Lithium tantalate crystals are used as an electro-optical Q - switch and substrate for integrated optics, sensors and frequency converters. They are mainly used to implement SAW components . A pyroelectric crystal made of lithium tantalate was used as a voltage source in connection with investigations into pyrofusion .

Individual evidence

↑ ^a ^b ^c ^d ^e Korth crystals: lithium tantalate
↑ ^a ^b data sheet lithium tantalate, ≥99.99% from Sigma-Aldrich , accessed on January 10, 2012 ( PDF ).
↑ MinDat: Lithiowodginite
↑ ^a ^b Joachim Frühauf: Materials in microtechnology . Carl Hanser Verlag, 2005, ISBN 978-3-446-22557-2 ( page 77 in the Google book search).
↑ Manfred Müller: Interaction of light with ferroelectric domains in lithium niobate and lithium tantalate crystals . Bonn 2004, DNB 971832986 , urn : nbn: de: hbz: 5N-03854 (dissertation, University of Bonn).
↑ Eugene Hecht: Optics . Walter de Gruyter GmbH & Co KG, 2018, ISBN 978-3-11-052670-7 ( limited preview in the Google book search).
↑ S. Huband, DS Keeble u. a .: Relationship between the structure and optical properties of lithium tantalate at the zero-birefringence point. In: Journal of Applied Physics. 121, 2017, p. 024102, doi : 10.1063 / 1.4973685 .
↑ Nuclear fusion in small format. In: Neue Zürcher Zeitung . May 4, 2005, accessed September 5, 2017 .
^ MJ Saltmarsh: Technology: Warm fusion . In: Nature . tape 434 , no. 7037 , April 2005, p. 1077-1080 , doi : 10.1038 / 4341077a .
↑ B. Naranjo, JK Gimzewski, p Putterman: Observation of nuclear fusion driven by a pyroelectric crystal . In: Nature . tape 434 , no. 7037 , April 2005, p. 1115–1117 , doi : 10.1038 / nature03575 .

[Korth-1] Korth crystals: lithium tantalate

[Sigma-2] ta sheet lithium tantalate, ≥99.99% from Sigma-Aldrich , accessed on January 10, 2012 ( PDF ).

[3] MinDat: Lithiowodginite

[Frühauf-4] Joachim Frühauf: Materials in microtechnology . Carl Hanser Verlag, 2005, ISBN 978-3-446-22557-2 ( page 77 in the Google book search).

[5] Manfred Müller: Interaction of light with ferroelectric domains in lithium niobate and lithium tantalate crystals . Bonn 2004, DNB 971832986 , urn : nbn: de: hbz: 5N-03854 (dissertation, University of Bonn).

[Eugene_Hecht-6] Eugene Hecht: Optics . Walter de Gruyter GmbH & Co KG, 2018, ISBN 978-3-11-052670-7 ( limited preview in the Google book search).

[DOI10.1063/1.4973685-7] S. Huband, DS Keeble u. a .: Relationship between the structure and optical properties of lithium tantalate at the zero-birefringence point. In: Journal of Applied Physics. 121, 2017, p. 024102, doi : 10.1063 / 1.4973685 .

[8] Nuclear fusion in small format. In: Neue Zürcher Zeitung . May 4, 2005, accessed September 5, 2017 .

[9] MJ Saltmarsh: Technology: Warm fusion . In: Nature . tape 434 , no. 7037 , April 2005, p. 1077-1080 , doi : 10.1038 / 4341077a .

[10] B. Naranjo, JK Gimzewski, p Putterman: Observation of nuclear fusion driven by a pyroelectric crystal . In: Nature . tape 434 , no. 7037 , April 2005, p. 1115–1117 , doi : 10.1038 / nature03575 .