Structure of the low-temperature variety of calcium sodium orthophosphate, NaCaPO4

Abstract

Abstract. Mr= 158.0, orthorhombic, Pn2ja, a= 20.397(10)

Optical Properties and Energy Transfer of NaCaPO4:Ce3+,Tb3+ Phosphors for Potential Application in Light‐Emitting Diodes

“…NaCaPO 4 has an orthorhombic crystal structure with space group Pn2 1 a, and the structure can be described as a superstructure of β-K 2 SO 4 . [23] As shown in Figure S1 in the Supporting Information, it is made up of two types of strings along the a axis, A and B. String A consists of alternating [PO 4 ] tetrahedra and Na atoms.…”

Principles and phenomena of bioengineering with glass-ceramics for dental restoration

“…However, the results of the HT-XRD investigations shown in Fig. 5a and b and those of the studies conducted by Bredig, 22 Ben Almara et al 23 and Kaprálik and Hanic 24 clearly indicate that the symmetry of the high-temperature form of rhenanite changes compared to the low-temperature form. Therefore, an entirely different XRD diagram resulted for the high-temperature modification of rhenanite compared with the low-temperature form.…”

Preparation and properties of the green-emitting phosphors NaCa0.98−xMgxPO4:

“…NaCaPO 4 is isostructural with b-K 2 SO 4 , and P 5+ occupies the tetrahedral sites constructed with O 2À , composing PO 3À 4 anion complex. Na + is surrounded by six oxygen ions, and Ca 2+ is surrounded by eight oxygen ions [16]. This implies that there is only one kind site on which Eu 2+ and Mg 2+ are expected, viz.…”

“…Later the crystal structure of a-NaCaPO 4 (JCPDS No. 76-1456, a = 20.397 nm, b = 5.412 nm, c = 9.161 nm) with b-K 2 SO 4 structure was studied by Ben Amara et al The difference of b-NaCaPO 4 (Pnam) and a-NaCaPO 4 (Pmn21) confirms the presence of small intensity superstructure reflections because of three different orientations adopted by the three independent [PO 4 ] tetrahedra [16]. In this paper, the NaCa-PO 4 was selected as the host materials because of its excellent chemical and thermal stabilization [17].…”