# US 5,705,695 A · Quaternary Zintl composition (Et.sub.4 N).sub.4 ›Au(Ag.sub.1-x Au.sub.x).sub.2 Sn.sub.2 Te.sub.9 !

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- Number: US 5,705,695 A
- Document ID: US5705695A
- Status: Granted
- Kind: A
- Application number: 08/769,720
- Filed: 1996-12-18
- Granted: 1998-01-06
- Earliest claimed: 1996-12-18
- Assignees: NEC Research Institute, Inc.
- Inventors: Robert C. Haushalter; Sandeep S. Dhingra
- Web page: https://patentgrep.com/patent/US5705695A

## CPC

- C07C 211/63: having quaternised nitrogen atoms bound to acyclic carbon atoms
- B82Y 10/00: Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C01B 19/002: {Compounds containing, besides selenium or tellurium, more than one other element, with -O- and -OH not being considered as anions}
- C01P 2002/77: by unit-cell parameters, atom positions or structure diagrams
- C01P 2006/42: Magnetic properties
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

The quaternary Zintl material (Et.sub.4 N).sub.4 ›Au(Ag.sub.1-x Au.sub.x).sub.2 Sn.sub.2 Te.sub.9 ! that contains 1-D semiconducting chains composed of four metallic elements is prepared by treating ethylenediamine extracts of a pentanary K--Au--Ag--Sn--Te alloy with Et.sub.4 NI.

## Claims

### Claim 1

The composition (Et.sub.4 N).sub.4 ›Au(Ag.sub.1-x Au.sub.x).sub.2 Sn.sub.2 Te.sub.9 ! where Et.sub.4 N is tetraethylammonium and x=0.32.

### Claim 2 (depends on 1)

The composition of claim 1 further characterized by one-dimensional chains of ›Au(Ag.sub.1-x Au.sub.x).sub.2 Sn.sub.2 Te.sub.9 !.sup.4-.

### Claim 3 (depends on 3)

The composition of claim 3 further characterized in that each chain contains a ›Au--Te--Te--Te!.sub..infin. strand.

### Claim 4 (depends on 1)

The composition of claim 1 further characterized in that it is essentially diamagnetic and nearly temperature independent down to 4 Kelvin.

### Claim 5 (depends on 1)

A process for preparing the composition of claim 1 that comprises the steps of:
fusing stoichiometric amounts of K.sub.2 Te, Au, Ag, Sn and Te to produce a pentanary alloy of nominal composition K.sub.6 AuAg.sub.2 Sn.sub.2 Te.sub.9 ;
crushing said alloy into a fine powder;
extracting said powder with ethylenediamine;
filtering said extract; and
adding said filtered extract to an ethylenediamine solution of Et.sub.4 NI.

### Claim 6 (depends on 5)

The process according to claim 5 wherein said step of adding said filtered extract to said solution of E.sub.4 NI results in the formation of crystals of (E.sub.4 N).sub.4 ›Au(Ag.sub.1-x Au.sub.x).sub.2 Sn.sub.2 Te.sub.9 !.