Investigations of phase relations in the system CaONa 2 OK 2 OP 2 O 5 | Zendy

Schneider M. | Zendy; Gildenhaar R. | Zendy; Berger G. | Zendy

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Investigations of phase relations in the system CaONa 2 OK 2 OP 2 O 5

Author(s) -

Schneider M.,

Gildenhaar R.,

Berger G.

Publication year - 1994

Publication title -

crystal research and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.377

H-Index - 64

eISSN - 1521-4079

pISSN - 0232-1300

DOI - 10.1002/crat.2170290516

Subject(s) - lattice constant , superlattice , hexagonal crystal system , diffractometer , lattice (music) , atmospheric temperature range , crystallography , hexagonal lattice , chemistry , materials science , diffraction , analytical chemistry (journal) , crystal structure , thermodynamics , condensed matter physics , physics , optics , optoelectronics , antiferromagnetism , acoustics , chromatography

The lattice constants of the compound Ca 2 NaK(PO 4 ) 2 have been studied at room temperature using an X‐ray powder diffractometer and also in the temperature range from 20 up to 1000 °C by Guinier‐Lenné‐technology. A hexagonal lattice with the parameters a 0 = 5.4367 Å and c 0 = 7.3125 Å and a cell volume of 187.18 Å 3 has been determined for the high temperature phase, existing from 670 °C upward. At temperatures below 670 °C a superlattice structure is formed by tripling the axis a , a ′, and c so that it results in a hexagonal superlattice structure cell with the lattice constants of a 0 = 16.311 Å and c 0 = 21.939 Å and a cell volume of 5054 Å 3 .

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